CN100491581C - Low temperature boronizing process on hot work die steel surface - Google Patents
Low temperature boronizing process on hot work die steel surface Download PDFInfo
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- CN100491581C CN100491581C CNB2006101253703A CN200610125370A CN100491581C CN 100491581 C CN100491581 C CN 100491581C CN B2006101253703 A CNB2006101253703 A CN B2006101253703A CN 200610125370 A CN200610125370 A CN 200610125370A CN 100491581 C CN100491581 C CN 100491581C
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- boronizing
- die steel
- temperature
- low
- paste
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000005271 boronizing Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 235000019270 ammonium chloride Nutrition 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000005202 decontamination Methods 0.000 claims description 3
- 230000003588 decontaminative effect Effects 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims 1
- 239000002105 nanoparticle Substances 0.000 claims 1
- -1 potassium fluoroborate Chemical compound 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 125000002723 alicyclic group Chemical group 0.000 description 5
- 239000012190 activator Substances 0.000 description 3
- 235000011837 pasties Nutrition 0.000 description 3
- 238000005480 shot peening Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000002341 toxic gas Substances 0.000 description 3
- KRQUFUKTQHISJB-YYADALCUSA-N 2-[(E)-N-[2-(4-chlorophenoxy)propoxy]-C-propylcarbonimidoyl]-3-hydroxy-5-(thian-3-yl)cyclohex-2-en-1-one Chemical compound CCC\C(=N/OCC(C)OC1=CC=C(Cl)C=C1)C1=C(O)CC(CC1=O)C1CCCSC1 KRQUFUKTQHISJB-YYADALCUSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000863032 Trieres Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003961 penetration enhancing agent Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a low-temperature boronizing method of heat mould steel surface, which comprises the following steps: a. proceeding nanometer disposal for steel mould surface; b. removing dirt on the surface of steel sample; c. boronizing in the vacuum; d. cooling to indoor temperature; coating boronizing agent with thickness at 2-5mm; drying.
Description
Technical field
The present invention relates to a kind ofly carry out the low-temperature boriding treatment process at surface of hot die steel, can improve hardness, wear resistance, thermohardening, erosion resistance, oxidation-resistance and the thermal fatigue resistance of surface of hot die steel, increase substantially its work-ing life, high temperature life particularly enlarges the Application Areas of hot-work die steel.
Background technology
Hot-work die steel is widely used in hot-forging die, hot extruding die and transfer mold etc.These mold work conditions are very harsh, thereby need have hot strength, impelling strength, thermal fatigue resistance and abrasion resistance preferably.
Boride layer is a rising chemical heat treatment process owing to have advantages such as high hardness, wear resistance, thermohardening and erosion resistance and good in oxidation resistance.At present, the boronizing method that adopts in the production still mainly is traditional methods such as solid powder method, salt bath diffusion process and gas boronising.The solid powder method boronising heating of need casing, the heating duration. big energy-consuming. the penetration enhancer consumption is big.Increase the boriding process cost, and labour intensity is big, and labor condition is poor, can not adapt to the needs of modern production. liquid boriding is owing to the flowability that exists the borax salt bath is poor. and serious to corrosion of crucible, part is difficult to shortcomings such as cleaning, fails to be used widely industrial.Both at home and abroad the gas boriding of report mainly is the source of the gas problem, not only costs an arm and a leg as the boron trichloride and the diborane of boron source, and severe toxicity is arranged, and also has the danger of blast when adopting carrier gas, therefore still enters industrial applications.Also there are following two shortcomings in conventional boronising simultaneously: 1. boronising temperature height (850 ℃～1000 ℃), time are long, and it is bigger to distort after the heat treatment of workpieces; 2. boride layer fragility is big, and is not firm with matrix bond, peels off easily, thereby hindered further developing and using of boriding process significantly.
Chinese invention patent application number 85105278 " pressure boost adsorpotion low temprature boriding industrial art " discloses the very fast decomposition that a kind of method with pressure boost delays activator.Add hypersober, absorption stores that activator decomposed urges the permeation body. then by progressively decompression, promotes still undecomposed activator to continue decomposition, make be adsorbed urge the permeation body to take off gradually analysing.Guarantee to have all the time in the boronising jar continuous mobile and urged the permeation body, improved boronising speed.It is on existing boronizing technology basis, has realized precision component below steel stagnation point A1 point, particularly at the low-temperature boriding of 560～620 ℃ of scopes.
Chinese invention patent application number 200510027282.5 " technological process for surface low temperature boriding of low carbon steel " discloses a kind of processing method of surface low temperature boriding of low carbon steel, and characteristics are earlier nanometer to be carried out on the steel surface, carry out plasma low-temperature boriding subsequently.Its characteristics also are to feed the toxic gas of boracic.
The processing method of above-mentioned two kinds of low-temperature boridings all has a weak point to be to need to feed the toxic gas of boracic, influences bigger to environment and equipment.Above-mentioned low-temperature boriding process does not all relate to the low-temperature boriding on die steel surface simultaneously, can not carry out boronising to the specific part of test specimen.
Summary of the invention
The technical problem to be solved in the present invention is, overcome conventional boronising temperature height, workpiece deformation is big, the shortcoming that boronising speed is low, and overcome in the above-mentioned low-temperature boriding patent and to need to feed toxic gas, the weak point that has greater environmental impacts provides a kind of and is suitable for industrial application, boronising position and the good surface low-temperature boriding process for hot-work die steel of boronising speed-controllable, thereby makes the integral body of die steel or part have hot strength, impelling strength, hot tearing drag and abrasion resistance preferably.
The technical solution adopted in the present invention is: surface low-temperature boriding process for hot-work die steel, a, nanometer is carried out on the die steel surface handle, b, the die steel sample behind the nanometer is carried out surface decontamination handle, c, vacuum boronizing, cool to room temperature with the furnace at d; It is characterized in that: after sample carries out the surface decontamination processing, need the surface of boronising evenly to apply the boronizing paste of the about 2～5mm of a layer thickness, carry out vacuum boronizing after the drying at it.
Aforesaid surface low-temperature boriding process for hot-work die steel is characterized in that: the component of boronizing paste is norbide B
4C 20-25%, potassium fluoborate KFB
48-10%, iron powder Fe 60-65%, ammonium chloride NH
4Cl 1-2%, activated carbon 2-4%; By weight with above-mentioned raw materials composition and an amount of alicyclic organic and certain even also furnishing pasty state of clear water mediation; Feedstock composition: alicyclic organic: clear water=70: 15-20: 10-15.
Its concrete process is as follows:
A. at first before boronising, adopt surface mechanical attrition method or ultrasonic shot peening method, nanometer is carried out on the die steel surface handle; B. the die steel sample behind the nanometer is carried out degreasing and rust removal and handle, evenly apply the boronizing paste of the about 2～5mm of a layer thickness subsequently at specimen surface, the sample after the coating is through seasoning or 150～160 ℃ of oven dry; The sample that c. will scribble boronizing paste is put into the plasma heat treatment stove; Vacuumize, make the interior vacuum tightness of stove reach 10～50Pa; Opening power then, the ion aura heats input voltage and input current between electrode to produce; Feed argon gas simultaneously as work atmosphere, the flow of argon gas is sucked by negative pressure; The operating voltage of input is controlled at 800～1200V scope; The stove internal gas pressure is controlled at 300～800Pa scope after sending into argon gas; The boronising thermal treatment temp is 500～700 ℃, after being incubated 4～10 hours under this temperature, cools to room temperature with the furnace, takes out the die steel sample and the cleaning surface of surface boronizing at last.
The component of boronizing paste is an amount of B
4C, KFB
4, iron powder, ammonium chloride and activated carbon, above-mentioned raw materials and an amount of alicyclic organic and certain clear water are in harmonious proportion evenly and the furnishing pasty state.Compositional range is as follows:
B
4C (norbide) 20-25%, KFB
4(potassium fluoborate) 8-10%, Fe (iron powder) 60-65%,
NH
4Cl (ammonium chloride) 1-2%, activated carbon 2-4%.
Feedstock composition: alicyclic organic: clear water=70: 15-20: 10-15 (weight ratios).
Adopt hot-work die after present method is handled except that obtaining high rigidity infiltration layer and good wear resistance, it is low also to have the boronising temperature, workpiece deformation is little, boronising speed is fast, and boride layer is controlled, and the thermal fatigue property of boronising steel is higher, environmentally safe, characteristics that need not subsequent heat treatment can be accomplished local low-temperature boriding fast (to needing the place coating boronizing paste of boronising) to hot-work die simultaneously, therefore are well suited for the surface treatment of hot-work die steel.Adopt above-mentioned boronizing paste to be particularly suitable for the quick low-temperature boriding of interalloy chromium series hot die steel.
Embodiment
The low-temperature boriding processing step of embodiments of the invention is as follows:
1. at first before boronising, adopt surface grinding machine that H13 steel specimen surface is carried out nanometer and handle.Adopted existing SNC-1 metal-surface nano trier in the present embodiment, this machine is subsidiary cooling water circulating device, is provided with a container in the machine, and its back side is fixed with a preparation and makes the soft steel sample that nanometer is handled on container cover; The small ball that the nanometer shot-peening is used is housed in the container, and the diameter of small ball is 6mm, has 250; Container cover is closed sealing, and vacuumize; Actuating motor then, motoring ring test machine high speed rotating, and make nanometer shot-peening small ball strenuous exercise implement nanometer to metallic surface self by vibration machine to handle, the treatment time is 1.5 hours.
2. the H13 steel sample after above-mentioned nanometer being handled carries out degreasing and rust removal to be handled, subsequently specimen surface evenly the boronizing paste of the about 2～5mm of coating one layer thickness (the paste component is 23%B
4C, 9%KFB
4, 64% iron powder, 1% ammonium chloride and 3% activated carbon, 70 parts of above-mentioned raw materials compositions are in harmonious proportion evenly and the furnishing pasty state with 18 parts alicyclic organic and 12 parts clear water), the sample after the coating is through seasoning or 150 ℃ of oven dry; Subsequently sample is put into existing LD-5 type plasma heat treatment stove; Vacuumize, make that vacuum reaches 50Pa in the stove, opening power then, the ion aura heats input voltage and input current between electrode to produce; Feed argon gas simultaneously as work atmosphere, the flow of argon gas is sucked by negative pressure; The operating voltage of input is controlled at 920V; The stove internal gas pressure is controlled at the 500Pa scope after sending into argon gas; The boronising thermal treatment temp is 580 ℃, cools to room temperature in insulation under this temperature with the furnace after 8 hours, takes out the die steel sample of surface boronizing at last.
After testing, the thickness of its nanometer layer of sample of gained is 25～32 microns in the processing step the first step, and crystal grain is of a size of 15～100 nanometers in this layer.After testing, the die steel sample after plasma low-temperature boriding is handled, its surface boronizing layer thickness is 50～100 nanometers, main phase structure is Fe
2B, this diffusion layer organization densification, its surface microhardness is 1700～2300HV
0.2
The surface treatment of hot-work die steel usually has the demand of boronising in the local rather than integral body of test specimen, adopt method of the present invention to accomplish local low-temperature boriding fast (to needing the place coating boronizing paste of boronising) to hot-work die, thereby saved the time of boronising, can reduce the cost of handling test specimen.Therefore be well suited for the surface treatment of hot-work die steel.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101253703A CN100491581C (en) | 2006-12-08 | 2006-12-08 | Low temperature boronizing process on hot work die steel surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101253703A CN100491581C (en) | 2006-12-08 | 2006-12-08 | Low temperature boronizing process on hot work die steel surface |
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| Publication Number | Publication Date |
|---|---|
| CN1970825A CN1970825A (en) | 2007-05-30 |
| CN100491581C true CN100491581C (en) | 2009-05-27 |
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|---|---|---|---|
| CNB2006101253703A Expired - Fee Related CN100491581C (en) | 2006-12-08 | 2006-12-08 | Low temperature boronizing process on hot work die steel surface |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560508A (en) * | 2012-03-01 | 2012-07-11 | 上海理工大学 | Method for modifying surface of metal material by using surface mechanical attrition treatment |
| CN105821406B (en) * | 2012-04-09 | 2018-08-10 | 天津大学 | Application of the ultrasonic shot peening in Alloying on Metal Planes |
| CN104946994B (en) * | 2015-06-30 | 2017-01-25 | 上海瀚氏模具成型有限公司 | Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould |
| CN106048514A (en) * | 2016-06-27 | 2016-10-26 | 滁州帝邦科技有限公司 | Preparing method for wear-resisting steel used for water-cooling nozzle |
| CN109402332A (en) * | 2018-10-08 | 2019-03-01 | 河南精诚汽车零部件有限公司 | A kind of heat treatment process of aluminium alloy extrusion mould |
| CN110306152A (en) * | 2018-12-03 | 2019-10-08 | 盐城金刚星精密锻造有限公司 | A kind of pinion steel surface boronizing process |
| CN110438441B (en) * | 2019-09-12 | 2021-07-27 | 西安建筑科技大学 | A Si-Co-Y interpenetrating layer prepared by nano-assisted preparation of Ti alloy surface and preparation method thereof |
| CN110863172A (en) * | 2019-11-16 | 2020-03-06 | 北方民族大学 | A kind of Cr-Si-Zr-B infiltration agent and its application method on the surface of tantalum and tantalum alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1019231B (en) * | 1989-11-30 | 1992-11-25 | 科特电子公司 | Liquid metering and transfer valve assembly |
| CN1076970A (en) * | 1992-04-04 | 1993-10-06 | 朱孝华 | Boronising of metal for imitation |
| RU2210617C1 (en) * | 2001-11-29 | 2003-08-20 | Восточно-Сибирский государственный технологический университет | Combined carbon steel boronizing method |
-
2006
- 2006-12-08 CN CNB2006101253703A patent/CN100491581C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1019231B (en) * | 1989-11-30 | 1992-11-25 | 科特电子公司 | Liquid metering and transfer valve assembly |
| CN1076970A (en) * | 1992-04-04 | 1993-10-06 | 朱孝华 | Boronising of metal for imitation |
| RU2210617C1 (en) * | 2001-11-29 | 2003-08-20 | Восточно-Сибирский государственный технологический университет | Combined carbon steel boronizing method |
Non-Patent Citations (1)
| Title |
|---|
| 结构钢真空膏剂渗硼后的组织与性能. 王建等.兵器材料科学与工程，第19卷第6期. 1996 * |
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| CN1970825A (en) | 2007-05-30 |
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