JPH08302441A - Cemented carbide for impact resistant tools - Google Patents
Cemented carbide for impact resistant toolsInfo
- Publication number
- JPH08302441A JPH08302441A JP7108581A JP10858195A JPH08302441A JP H08302441 A JPH08302441 A JP H08302441A JP 7108581 A JP7108581 A JP 7108581A JP 10858195 A JP10858195 A JP 10858195A JP H08302441 A JPH08302441 A JP H08302441A
- Authority
- JP
- Japan
- Prior art keywords
- cemented carbide
- particles
- particle size
- area
- total area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002245 particle Substances 0.000 claims abstract description 52
- 239000011230 binding agent Substances 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 150000004767 nitrides Chemical class 0.000 claims abstract description 3
- 150000001247 metal acetylides Chemical class 0.000 claims abstract 2
- 229910045601 alloy Inorganic materials 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 18
- 230000000737 periodic effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- SQMWSBKSHWARHU-SDBHATRESA-N n6-cyclopentyladenosine Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C2=NC=NC(NC3CCCC3)=C2N=C1 SQMWSBKSHWARHU-SDBHATRESA-N 0.000 description 5
- 229910009043 WC-Co Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000006061 abrasive grain Substances 0.000 description 2
- 238000010273 cold forging Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
(57)【要約】
【目的】 耐衝撃性と耐摩耗性がバランスよく優れた耐
衝撃工具用超硬合金を提供すること。
【構成】 硬質相の９５％以上がＷＣで、硬質相の残部
が周期律表のＩＶａ、Ｖａ、ＶＩａ族元素（Ｗを除く）
の炭化物、窒化物及び炭窒化物の少なくとも１種により
構成され、結合相がＣｏ、Ｎｉ及びＦｅの少なくとも１
種からなり、その含有量が超硬合金の５〜３０重量％で
ある超硬合金であって、該合金中のＷＣ粒径が、４．５
〜７．５μｍの粒子が５０〜７５％、１．５〜４．５μ
ｍの粒子が１５〜４０％（ただしＷＣ全体を１００％と
したときの面積比）の範囲にあり、（４．５〜７．５μ
ｍのＷＣ合計面積）／（１．５〜４．５μｍのＷＣ合計
面積）＝２／１〜５／１の関係を満たし、かつ１μｍ以
下のＷＣ粒子の面積比が３％以下の耐衝撃工具用超硬合
金。
(57) [Abstract] [Purpose] To provide a cemented carbide for impact resistant tools, which has a good balance of impact resistance and wear resistance. [Structure] 95% or more of the hard phase is WC, and the rest of the hard phase is a group IVa, Va, or VIa element (excluding W) of the periodic table.
Of at least one of the following carbides, nitrides and carbonitrides, and the binder phase is at least one of Co, Ni and Fe.
A cemented carbide having a seed content of 5 to 30% by weight of the cemented carbide, and having a WC particle size of 4.5.
50 to 75% of particles of ~ 7.5 μm, 1.5 to 4.5 μm
m particles are in the range of 15 to 40% (however, the area ratio when the entire WC is 100%), and (4.5 to 7.5 μm).
m WC total area) / (1.5 to 4.5 μm WC total area) = 2/1 to 5/1, and the impact ratio of the WC particles having an area ratio of 1 μm or less is 3% or less. Cemented carbide for use.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧延用ロール、鉱山土
木工具、冷間又は温熱間鍛造工具等の耐衝撃工具用超硬
合金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide for impact resistant tools such as rolling rolls, mining civil engineering tools, cold or hot forging tools and the like.
【０００２】[0002]
【従来の技術】耐衝撃工具用超硬合金としては、主とし
て耐亀裂性を上げるため平均粒径５〜７μｍのＷＣを用
いる粗粒ＷＣ−Ｃｏ合金が使用されている。更により耐
摩耗性が必要な場合は、ＷＣ粒子の粒度をより微粒側
（例えば３〜５μｍ）にするか、又はＣｏ量を減少させ
ることにより硬度を上げて耐摩耗性を向上させる方法が
とられている。2. Description of the Related Art As a cemented carbide for impact resistant tools, a coarse-grained WC-Co alloy is used which mainly uses WC having an average grain size of 5 to 7 .mu.m in order to improve crack resistance. If more wear resistance is required, a method of increasing the hardness by increasing the particle size of the WC particles to a finer particle size (for example, 3 to 5 μm) or reducing the Co content to improve the wear resistance is possible. Has been.
【０００３】[0003]
【発明が解決しようとする課題】従来の技術では、耐衝
撃性（耐亀裂性）と耐摩耗性は相反する関係にあり、一
方を強化すると他方は必然的に劣化する為、工具として
の総合性能（耐衝撃性＋耐摩耗性）の改善には限界があ
った。そこで、本発明は上記のような課題を解決するた
めになされたものであって、ＷＣ粒子の粘度の分布を調
整することにより、耐衝撃性と耐摩耗性の双方をバラン
スよく満足することのできる耐衝撃工具用超硬合金を提
供することを目的とする。In the prior art, impact resistance (crack resistance) and wear resistance are in a contradictory relationship, and strengthening one inevitably deteriorates the other. There was a limit to the improvement of performance (impact resistance + wear resistance). Therefore, the present invention has been made to solve the above-described problems, and it is possible to satisfy both the impact resistance and the wear resistance in a well-balanced manner by adjusting the viscosity distribution of the WC particles. An object of the present invention is to provide a cemented carbide for impact resistant tools.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、合金中の
ＷＣ粒子の粒度分布に着目し、種々の粒度分布を持つ合
金を試作、研究した。その結果、合金中のＷＣを４．５
〜７．０μｍの範囲の粒子を生体とし、１．５〜４．５
μｍの範囲の粒子量を特定の割合とする事で同じ耐衝撃
性を持つ従来合金より著しく耐摩耗性の優れた超硬合金
が得られる結果を得た。[Means for Solving the Problems] The inventors of the present invention paid attention to the particle size distribution of WC particles in the alloy, and made and studied alloys having various particle size distributions. As a result, the WC in the alloy was 4.5
Particles in the range of up to 7.0 μm are used as living bodies, and 1.5 to 4.5
By setting the amount of particles in the range of μm to a specific ratio, a cemented carbide having significantly higher wear resistance than the conventional alloy having the same impact resistance was obtained.
【０００５】すなわち、本発明は、硬質相の９５％以上
がＷＣ粒子で、硬質相の残部が周期律表のＩＶａ、Ｖ
ａ、ＶＩａ族元素（Ｗを除く）の炭化物、窒化物及び炭
窒化物の少なくとも１種により構成され、結合相がＣ
ｏ、Ｎｉ及びＦｅの少なくとも１種からなり、その含有
量が超硬合金の５〜３０重量％である超硬合金であっ
て、該合金中のＷＣ粒径が、４．５〜７．５μｍの粒子
が５０〜７５％、１．５〜４．５μｍの粒子が１５〜４
０％（ただしＷＣ粒子全体を１００％としたときの面積
比）の範囲にあり、（４．５〜７．５μｍのＷＣ合計面
積）／（１．５〜４．５μｍのＷＣ合計面積）＝２／１
〜５／１の関係を満たし、かつ１μｍ以下のＷＣ粒子の
面積比が３％以下の耐衝撃工具用超硬合金を提供するも
のであり、特に粒径７．５μｍを超えるＷＣ粒子を含有
し、（４．５μｍ以上のＷＣ合計面積）／（１．５〜
４．５μｍのＷＣ合計面積）が６／１を超えないものが
好ましい。ここで用いるＷＣ粒子の粒子径は、各ＷＣ粒
子の面積を同面積の円形粒子としたときの直径に相当す
る値と定義する。That is, in the present invention, 95% or more of the hard phase is WC particles, and the rest of the hard phase is IVa or V of the periodic table.
a, VIa group element (excluding W), at least one of carbide, nitride and carbonitride, and the binder phase is C
a cemented carbide containing at least one of o, Ni, and Fe, the content of which is 5 to 30% by weight of the cemented carbide, and the WC particle size in the alloy is 4.5 to 7.5 μm. Particles of 50 to 75% and particles of 1.5 to 4.5 μm are 15 to 4
It is in the range of 0% (however, the area ratio when the entire WC particles are set to 100%), (WC total area of 4.5 to 7.5 μm) / (WC total area of 1.5 to 4.5 μm) = 2/1
To provide a cemented carbide for impact-resistant tools having an area ratio of WC particles of 1 μm or less and 3% or less, which contains WC particles having a particle size of 7.5 μm or more. , (WC total area of 4.5 μm or more) / (1.5 to
It is preferable that the WC total area of 4.5 μm) does not exceed 6/1. The particle diameter of the WC particles used here is defined as a value corresponding to the diameter when the area of each WC particle is a circular particle having the same area.
【０００６】[0006]
【作用】耐衝撃性（耐亀裂性）を上げるには、粗粒ＷＣ
の比率を上げればよい。亀裂進展エネルギーは、ＷＣ／
Ｃｏ界面が最も低く、ＷＣ相を破壊しての進展やＣｏ相
内の進展は高い。しかし、粗大ＷＣ粒子が多過ぎると、
Ｃｏ相による結合界面面積が減少し強度が低下すると共
に、Ｃｏ相の厚みが大きくなり衝撃による超硬合金の塑
性変形が生じ易く、かえって工具寿命の低下を招く。そ
こで、本発明では、主体とするＷＣ粒径を４．５〜７．
５μｍとし、この面積割合を５０〜７５面積％とするこ
とで耐亀裂性を保ち、強度と耐塑性変形性を両立させる
ことができる。更に耐摩耗性を向上させるため、粒子径
１．５〜４．５μｍのＷＣ粒子を１５〜４０面積％含有
させる。これらのＷＣ粒子は、上記の粗粒ＷＣ粒子の間
に均一に分散し、Ｃｏ相の厚みを減少させ硬度を上げ、
耐摩耗性と耐塑性変形性を向上させる。又、Ｃｏ相によ
る結合界面面積が増大し強度（抗析力）が向上する。Function: To improve impact resistance (crack resistance), coarse grain WC
You can increase the ratio of. Crack propagation energy is WC /
The Co interface is the lowest, and the progress after breaking the WC phase and the progress within the Co phase are high. However, if there are too many coarse WC particles,
The bonding interface area due to the Co phase decreases and the strength decreases, and the thickness of the Co phase increases, and plastic deformation of the cemented carbide is likely to occur due to impact, which rather shortens the tool life. Therefore, in the present invention, the main WC particle size is 4.5 to 7.
By setting the area ratio to 5 μm and setting the area ratio to 50 to 75 area%, it is possible to maintain crack resistance and achieve both strength and plastic deformation resistance. Further, in order to further improve wear resistance, WC particles having a particle diameter of 1.5 to 4.5 μm are contained in an amount of 15 to 40 area%. These WC particles are evenly dispersed among the above coarse WC particles to reduce the thickness of the Co phase and increase the hardness,
Improves wear resistance and plastic deformation resistance. Further, the bonding interface area due to the Co phase is increased and the strength (anti-deposition force) is improved.
【０００７】以上のような合金中のＷＣ粒度に加え、
（４．５〜７．５μｍのＷＣ合計面積）／（１．５〜
４．５μｍのＷＣ合計面積）のＷＣ面積比が２／１〜５
／１であれば、この両者のＷＣ粒径から計算で求められ
る平均粒径値の粒度を持つＷＣ基超硬合金よりも格段に
性能のよい、すなわち、耐衝撃性と耐摩耗性の両者が極
めて優れた超硬合金が得られる。要するに、このＷＣ粒
度分布であれば、 ＷＣ平均粒径が同じ通常のＷＣ−Ｃｏ合金、 各ＷＣ粒度の超硬合金の特性や性能から（４．５〜
７．５μｍＷＣ）／（１．５〜４．５μｍＷＣ）の比率
で類推されるＷＣ−Ｃｏ合金、 に比べて全く異なる高性能が発揮される。In addition to the above WC grain size in the alloy,
(4.5-7.5 μm WC total area) / (1.5-
WC area ratio of 4.5 μm WC total area) is 2/1 to 5
If it is / 1, the performance is remarkably better than that of a WC-based cemented carbide having a particle size of an average particle size value calculated from the WC particle size of both of them, that is, both impact resistance and wear resistance are obtained. An extremely excellent cemented carbide can be obtained. In short, if this WC particle size distribution is used, from the characteristics and performances of a normal WC-Co alloy having the same WC average particle size and a cemented carbide of each WC particle size (4.5 to
7.5 μm WC) / (1.5 to 4.5 μm WC), a completely different high performance is exhibited as compared with the WC-Co alloy, which is inferred by the ratio.
【０００８】上記面積比が２／１未満では、粗粒ＷＣの
割合が減少し、亀裂進展を抑制する効果が劣り、又５／
１を越えると耐摩耗性には優れるものの硬度、強度の改
善効果が低くなるので好ましくない。なお、１．０μｍ
以下のＷＣ粒子が合金中に多いと粒子間を亀裂が進展し
易くなり、耐衝撃用工具材料としては好ましくないので
この粒径のＷＣ粒子はＷＣ面積比で３％以下に抑制する
ことが必要である。又７．５μｍを越える粗粒ＷＣにつ
いては、特に衝撃の激しい用途には耐亀裂性向上に効果
があるので含有させてもよいが、この場合でも、上記Ｗ
Ｃ面積比が６／１を上回ると、硬度、強度が劣るのでこ
れを越えてはならない。なお、結合金属相中にＺｒ、Ｔ
ａ、Ｗ、Ｃｒ、Ｍｏ等の周期律表ＩＶａ、Ｖａ、ＶＩａ
族元素が適当量固溶してもよい。If the area ratio is less than 2/1, the ratio of coarse particles WC is reduced, and the effect of suppressing crack growth is poor, and the ratio of 5 /
If it exceeds 1, the abrasion resistance is excellent, but the effect of improving the hardness and strength is lowered, which is not preferable. 1.0 μm
When the following WC particles are present in the alloy in a large amount, cracks easily grow between the particles, which is not preferable as a tool material for impact resistance. Therefore, it is necessary to suppress the WC particles of this particle size to 3% or less in WC area ratio. Is. Coarse-grained WC having a particle size of more than 7.5 μm may be contained because it has an effect of improving crack resistance particularly in applications where a high impact is exerted.
If the C area ratio exceeds 6/1, the hardness and strength deteriorate, and therefore it must not exceed this. Incidentally, Zr, T
Periodic Table IVa, Va, VIa of a, W, Cr, Mo, etc.
An appropriate amount of the group element may be solid-dissolved.
【０００９】[0009]
【実施例】以下本発明を実施例により更に詳細に説明す
るが本発明を限定する意図のものではない。下記実施
中、ＷＣ粒径毎の面積比率は次のようにして測定、計算
した。サンプルをダイヤモンド砥石、砥粒で鏡面仕上げ
し、村上氏試薬（アルカリ赤血塩溶液）でエッチングし
た後、光学顕微鏡により１５００倍にてランダムに１０
視野の写真を撮影する。この写真を用いて１０視野分
の、 ＷＣ粒径 １．５μｍ未満 のＷＣ面積の和− 〃 １．５μｍ以上４．５μｍ未満 〃 − 〃 ４．５μｍ以上７．５μｍ未満 〃 − 〃 ７．５μｍ以上 〃 − を求める。ここでＷＣ全体の面積ＳをＳ＝＋＋＋
とする。 計算法： (a) ４．５〜７．５μｍの粒径面積比率＝（／Ｓ）
×１００ (b)（４．５〜７．５μｍＷＣ合計面積）／（１．５〜
４．５μｍＷＣ合計面積）＝／ として求める。又摩耗量はＣＣＰＡ方式により測定し
た。すなわち、試料を回転板に固定し、Ａｌ2 Ｏ3 砥粒
と水のスラリ中で試料を回転板に押しつけ、回転板を所
定回数回転させてその間の摩耗体積を測定する。The present invention will be described in more detail with reference to the following examples, which are not intended to limit the present invention. During the following implementation, the area ratio for each WC particle size was measured and calculated as follows. The sample is mirror-finished with a diamond grindstone and abrasive grains, etched with Murakami's reagent (alkali red blood salt solution), and then randomly sampled at 1500 times with an optical microscope.
Take a picture of the field of view. Using this photograph, the sum of the WC area of WC grain size of less than 1.5 μm for 10 fields of view − 〃 1.5 μm or more and less than 4.5 μm 〃 − 〃 4.5 μm or more and less than 7.5 μm 〃 − 〃 7.5 μm or more 〃 − is asked. Here, the area S of the entire WC is S = +++
And Calculation method: (a) Particle size area ratio of 4.5 to 7.5 μm = (/ S)
× 100 (b) (4.5 to 7.5 μm WC total area) / (1.5 to
4.5 μm WC total area) = / The amount of wear was measured by the CCPA method. That is, the sample is fixed to a rotating plate, the sample is pressed against the rotating plate in a slurry of Al 2 O 3 abrasive grains and water, and the rotating plate is rotated a predetermined number of times to measure the wear volume during that time.
【００１０】（実施例１）表１に示される組成と粒度分
布を有する、ＷＣを主体とする原料組成物を、常法に従
い焼結して岩石掘削用ボタンビットチップに適する超硬
合金を得た。得られた各試料について硬度（ＨR Ａ）、
破壊靱性値（ＫIC，ＭＮ／ｍ3/2 ）、摩耗量（ＣＣＰＡ
法、ＣＣ／ｒｅｖ）を測定した結果を表１に示す。Example 1 A raw material composition mainly composed of WC having the composition and particle size distribution shown in Table 1 was sintered according to a conventional method to obtain a cemented carbide suitable for a button bit chip for rock excavation. It was The resulting hardness for each sample (H R A),
Fracture toughness value (K IC , MN / m 3/2 ), wear amount (CCPA
Method, CC / rev) is shown in Table 1.
【００１１】[0011]
【表１】 [Table 1]
【００１２】得られた超硬合金試料を用い、φ４５ネジ
式ロックビート（φ１０×Ｈ１６超硬合金チップ７個使
用）にて安山岩質の堀削を行った（打撃数３０００回／
分、打撃力１５ｋｗ）。結果を表２に示す。The obtained cemented carbide sample was used to excavate the andesitic rock with a φ45 screw type rock beat (using 7 φ10 × H16 cemented carbide tips) (3000 hits /
Min, striking force 15 kW). Table 2 shows the results.
【００１３】[0013]
【表２】 [Table 2]
【００１４】（実施例２）表３に示される組成と粒度分
布を有する、ＷＣを主体とする原料組成物を、常法に従
い焼結して冷間鍛造工具用超硬合金を得た。得られた各
試料について硬度（ＨR Ａ）、破壊靱性値（ＫIC）、摩
耗量（ＣＣＰＡ法）を測定した結果を表３に示す。Example 2 A raw material composition mainly composed of WC having the composition and particle size distribution shown in Table 3 was sintered according to a conventional method to obtain a cemented carbide for cold forging tools. The resulting hardness for each sample (H R A), fracture toughness (K IC), Table 3 shows the results of measuring the amount of wear (CCPA method).
【００１５】[0015]
【表３】 [Table 3]
【００１６】得られた超硬合金試料を用い、冷間鍛造工
具として表４の条件でハブボルト加工を行い、表５の結
果を得た。寿命は加工個数（４個）で表す。Using the obtained cemented carbide sample, hub bolt processing was performed as a cold forging tool under the conditions of Table 4, and the results of Table 5 were obtained. The life is represented by the number of processed pieces (4 pieces).
【００１７】[0017]
【表４】 [Table 4]
【００１８】[0018]
【表５】 [Table 5]
【００１９】（実施例３）表６に示される組成と粒度分
布を有する、ＷＣを主体とする原料組成物を、常法に従
い焼結して圧延ロール用超硬合金を得た。得られた各試
料について硬度（ＨR Ａ）、破壊靱性値（ＫIC）、摩耗
量（ＣＣＰＡ法）を測定した結果を表６に示す。Example 3 A raw material composition mainly composed of WC having the composition and particle size distribution shown in Table 6 was sintered according to a conventional method to obtain a cemented carbide for a rolling roll. The resulting hardness for each sample (H R A), fracture toughness (K IC), shown in Table 6 the results of measuring the amount of wear (CCPA method).
【００２０】[0020]
【表６】 [Table 6]
【００２１】得られた６インチモルガンロールにてバネ
用高級綱線材（φ８．０ｍｍ）の仕上げ圧延を行った。
圧延材温度９００℃、線速８０ｍ／ｓｅｃ、圧延荷重３
トンとした。表７の結果を得た。The 6-inch Morgan roll thus obtained was used to finish-roll a high-grade steel wire rod (φ8.0 mm).
Rolling material temperature 900 ° C, linear velocity 80m / sec, rolling load 3
Tons. The results shown in Table 7 were obtained.
【００２２】[0022]
【表７】 [Table 7]
【００２３】上記表７で寿命とは、１カリバー当りの圧
延可能量を示す。上記実施例１〜３の各試料（本発明合
金と比較合金）について摩耗量とＫICとの関係を図１に
示した。これより本発明合金は比較合金と比べて同一の
靱性であっても摩耗は少ないことが分かる。In Table 7 above, the term "life" refers to the amount of rolling possible per caliber. FIG. 1 shows the relationship between the wear amount and K IC for each of the samples of Examples 1 to 3 (the alloy of the present invention and the comparative alloy). This shows that the alloy of the present invention has less wear than the comparative alloy even if it has the same toughness.
【００２４】[0024]
【発明の効果】本発明によると、耐衝撃性を低下させる
ことなく、耐摩耗性を著しく向上させることができるの
で、本発明の合金は特に圧延ロール、鉱山、土木工具、
鍛造工具等の耐衝撃工具に用いるのに適する。According to the present invention, since the wear resistance can be remarkably improved without lowering the impact resistance, the alloy of the present invention is particularly suitable for rolling rolls, mines, civil engineering tools,
Suitable for use with impact resistant tools such as forging tools.
【図面の簡単な説明】[Brief description of drawings]
【図１】 図１は、本発明の合金と比較合金の破壊靱性
値ＫICと摩耗量（ＣＣＰＡ）との関係を示すグラフであ
る。FIG. 1 is a graph showing the relationship between the fracture toughness value K IC and the wear amount (CCPA) of the alloy of the present invention and the comparative alloy.
Claims (2)
相の残部が周期律表のＩＶａ、Ｖａ、ＶＩａ族元素（Ｗ
を除く）の炭化物、窒化物及び炭窒化物の少なくとも１
種により構成され、結合相がＣｏ、Ｎｉ及びＦｅの少な
くとも１種からなり、その含有量が超硬合金の５〜３０
重量％である超硬合金であって、該合金中のＷＣ粒径
が、４．５〜７．５μｍの粒子が５０〜７５％、１．５
〜４．５μｍの粒子が１５〜４０％（ただしＷＣ全体を
１００％としたときの面積比）の範囲にあり、（４．５
〜７．５μｍのＷＣ合計面積）／（１．５〜４．５μｍ
のＷＣ合計面積）＝２／１〜５／１の関係を満たし、か
つ１μｍ以下のＷＣ粒子の面積比が３％以下の耐衝撃工
具用超硬合金。1. 95% by weight or more of the hard phase is WC, and the balance of the hard phase is IVa, Va, or VIa group element (W
At least 1) of carbides, nitrides and carbonitrides
The binder phase is composed of at least one of Co, Ni and Fe, and the content thereof is 5 to 30 of the cemented carbide.
% Cemented carbide, wherein the WC particle size in the alloy is 4.5-7.5 μm, 50-75%, 1.5
Particles of ˜4.5 μm are in the range of 15 to 40% (however, the area ratio when the entire WC is 100%),
WC total area of ~ 7.5 μm) / (1.5-4.5 μm
WC total area) = 2/1 to 5/1, and an area ratio of WC particles of 1 µm or less is 3% or less.
し、（４．５μｍ以上のＷＣ合計面積）／（１．５〜
４．５μｍのＷＣ合計面積）が６／１を超えない請求項
１に記載の耐衝撃工具用超硬合金。2. WC particles having a particle size of more than 7.5 μm are contained, and (WC total area of 4.5 μm or more) / (1.5 to
The cemented carbide for impact resistant tool according to claim 1, wherein a WC total area of 4.5 μm) does not exceed 6/1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7108581A JPH08302441A (en) | 1995-05-02 | 1995-05-02 | Cemented carbide for impact resistant tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7108581A JPH08302441A (en) | 1995-05-02 | 1995-05-02 | Cemented carbide for impact resistant tools |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08302441A true JPH08302441A (en) | 1996-11-19 |
Family
ID=14488448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7108581A Pending JPH08302441A (en) | 1995-05-02 | 1995-05-02 | Cemented carbide for impact resistant tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08302441A (en) |
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| WO1999010551A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A PICK-STYLE TOOL WITH A CERMET INSERT HAVING A Co-Ni-Fe-BINDER |
| WO1999010552A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A ROTARY EARTH STRATA PENETRATING TOOL WITH A CERMET INSERT HAVING A Co-Ni-Fe-BINDER |
| WO1999010550A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | An elongate rotary machining tool comprising a cermet having a co-ni-fe-binder |
| WO1999010553A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A CUTTING INSERT OF A CERMET HAVING A Co-Ni-Fe-BINDER |
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| WO1999010551A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A PICK-STYLE TOOL WITH A CERMET INSERT HAVING A Co-Ni-Fe-BINDER |
| WO1999010552A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A ROTARY EARTH STRATA PENETRATING TOOL WITH A CERMET INSERT HAVING A Co-Ni-Fe-BINDER |
| WO1999010550A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | An elongate rotary machining tool comprising a cermet having a co-ni-fe-binder |
| WO1999010553A1 (en) * | 1997-08-27 | 1999-03-04 | Kennametal Inc. | A CUTTING INSERT OF A CERMET HAVING A Co-Ni-Fe-BINDER |
| AU735278B2 (en) * | 1997-08-27 | 2001-07-05 | Kennametal Inc. | An elongate rotary machining tool comprising a cermet having a CO-NI-FE-binder |
| JP2001514326A (en) * | 1997-08-27 | 2001-09-11 | ケンナメタル インコーポレイテッド | Cermet with binder having improved plasticity, method of manufacture and use thereof |
| CN1092241C (en) * | 1997-08-27 | 2002-10-09 | 钴碳化钨硬质合金公司 | A cutting insert of a cermet having a Co-Ni-Fe-binder |
| CN1094989C (en) * | 1997-08-27 | 2002-11-27 | 钴碳化钨硬质合金公司 | A rotary earth strata penetrating tool with a cermet insert having a Co-Ni-Fe binder |
| WO2006119522A1 (en) * | 2005-05-13 | 2006-11-16 | Boehlerit Gmbh & Co. Kg. | Hard metal body with tough surface region |
| JP2007069227A (en) * | 2005-09-06 | 2007-03-22 | Mitsubishi Materials Corp | Build-up welding material, excavating tool which is hard-faced by using the same, and wear preventing plate |
| JP2016053589A (en) * | 2013-01-17 | 2016-04-14 | オメガ・エス アー | Component for timepiece movement |
| CN108048723A (en) * | 2017-11-17 | 2018-05-18 | 北京有色金属研究总院 | A kind of wide size distribution hard alloy and preparation method thereof |
| JPWO2020196590A1 (en) * | 2019-03-25 | 2020-10-01 | ||
| WO2020196590A1 (en) * | 2019-03-25 | 2020-10-01 | 三菱マテリアル株式会社 | Wc-based cemented carbide cutting tool having excellent defect resistance and chipping resistance, and surface-coated wc-based cemented carbide cutting tool |
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