KR20120135546A - Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same - Google Patents
Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same Download PDFInfo
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- 230000032683 aging Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910052706 scandium Inorganic materials 0.000 title description 2
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 title description 2
- 238000001953 recrystallisation Methods 0.000 claims abstract description 10
- 229910000542 Sc alloy Inorganic materials 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 4
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000006104 solid solution Substances 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 238000000265 homogenisation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
스칸듐 첨가 알루미늄 합금의 강도와 연신율 증가를 위한 용체화 처리 및 자연시효 단계를 포함하는 스칸듐 첨가 알루미늄 합금 제조방법이 제공된다.
본 발명에 따른 스칸듐 첨가 알루미늄 합금 제조방법은 스칸듐 첨가 알루미늄 합금 제조방법은 Al-Zn-(Mg)-(Cu)-(Zr)-(Ti)-Sc 합금의 주조 및 균질화 처리 단계 후 재결정 분율 및 vacancy-cluster 생성양을 제어하고 연신율을 증가시키기 위한 용체화 처리 단계; 및 상온에서 유지되는 동안 G.P zone으로 석출되어 강도를 증가시키기 위한 자연시효 단계를 포함하는 것을 특징으로 하며, 본 발명에 의하면, 본 공정은 일반적인 알루미늄 시효 공정에 비하여 인공시효 단계를 생략하고도 일정 수준의 요구 강도와 연신율을 얻을 수 있다.Provided is a method for preparing a scandium-added aluminum alloy comprising a solution treatment and a natural aging step for increasing the strength and elongation of the scandium-added aluminum alloy.
Scandium-added aluminum alloy manufacturing method according to the present invention is a scandium-added aluminum alloy manufacturing method is the recrystallization fraction after the casting and homogenization treatment step of Al-Zn- (Mg)-(Cu)-(Zr)-(Ti) -Sc alloy and a solution treatment step to control the amount of vacancy-cluster production and to increase the elongation; And it is characterized in that it comprises a natural aging step for increasing the strength by being precipitated in the GP zone while maintaining at room temperature, according to the present invention, the process is a certain level without omitting the artificial aging step compared to the general aluminum aging process The required strength and elongation can be obtained.
Description
본 발명은 스칸듐 첨가 알루미늄 합금 제조 공정시 인공시효 처리 단계를 거치지 않고 용체화 처리 이후 상온에서 일정시간 유지(자연시효)함으로서 강도와 연신율을 증가시킬 수 있는 제조 공정에 대한 것이다.The present invention relates to a manufacturing process that can increase the strength and elongation by maintaining a certain time (natural aging) at room temperature after the solution treatment without undergoing an artificial aging treatment step in the scandium-added aluminum alloy manufacturing process.
최근 유가의 불안정한 정세는 각종 수송기기들의 경량화를 요구하게 되었고 이를 충족시키기 위한 알루미늄 합금은 점차 고강도를 요구하고 있다. 특히 아연(Zinc)가 주요 첨가 원소인 A7000계열 합금은 주로 항공기 부품이나 미사일 구조체에 적용되어 사용되고 있다. 이러한 적용분야는 경량화에 관심이 집중되고 있어 기존의 합금보다 고강도 알루미늄 합금의 수요는 증대 될 것이다. 하지만 이러한 7000계열 알루미늄 합금은 석출 경화형 합금이기 때문에 용체화 처리 이후 일정시간 인공시효 처리 공정을 거쳐야 일정 수준의 강도를 얻을 수 있었다. 따라서 열처리에 따른 비용 부담이 커지는 단점이 있다.In recent years, the unstable situation of oil prices has required the weight reduction of various transportation equipment, and aluminum alloys to meet this demand increasingly high strength. In particular, A7000 series alloys, in which zinc is a major additive element, are mainly used for aircraft parts or missile structures. In this field of application, attention is focused on lightweighting, and thus the demand for high-strength aluminum alloys will increase. However, since the 7000 series aluminum alloy is a precipitation hardening alloy, a certain level of strength can be obtained after a aging treatment process after a solution treatment. Therefore, there is a disadvantage in that the cost burden due to heat treatment increases.
본 발명이 해결하려는 과제는 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 석출 경화형 합금에서 인공적인 시효처리 단계를 거치지 않고 용체화 처리 단계 및 자연시효 공정 단계만으로 강도 및 연신율의 동반 상승 효과를 얻을 수 있는 공정을 제안한 것이다. The problem to be solved by the present invention has been devised to solve the above problems, in the precipitation hardening alloy to obtain a synergistic effect of strength and elongation only through the solution treatment step and the natural aging step without going through the artificial aging step It is proposed a process that can.
상기 과제를 해결하기 위하여, 본 발명은 Al-Zn-(Mg)-(Cu)-(Zr)-(Ti)-Sc 합금의 주조 및 균질화 처리 단계 후 재결정 분율 및 vacancy-cluster 생성양을 제어하고 연신율을 증가시키기 위한 용체화 처리 단계; 및 상온에서 유지되는 동안 G.P zone으로 석출되어 강도를 증가시키기 위한 자연시효 단계를 포함하는 것을 특징으로 하는 스칸듐 첨가 알루미늄 합금 제조방법을 제공한다. In order to solve the above problems, the present invention controls the recrystallization fraction and the amount of vacancy-cluster generated after the casting and homogenizing step of Al-Zn- (Mg)-(Cu)-(Zr)-(Ti) -Sc alloy Solution treatment step for increasing elongation; And it provides a method for producing a scandium-added aluminum alloy comprising a natural aging step for increasing the strength by being precipitated in the G.P zone while maintaining at room temperature.
상술한 바와 같이 본 발명에 의하면, 본 공정은 일반적인 알루미늄 시효 공정에 비하여 인공시효 단계를 생략하고도 일정 수준의 요구 강도와 연신율을 얻을 수 있다. 압출재의 경우 인장강도 기준 650MPa 연신율 16% 의 특성을 가지며 단조재의 경우 인장강도 600MPa,연신율 17%의 특성을 갖는다. 참고로 7075합금 인공시효(T6)처리재의 인장강도, 항복강도, 연신율 요구 조건은 각각 압출재의 경우 559MPa, 500MPa, 7% 이며 단조재의 경우 510MPa, 431MPa, 7%이다. 따라서 이러한 범위의 강도 및 연신율의 재료가 요구되는 경우 본 공정에 의한 합금을 이용할 시 기존의 인공시효 공정을 실행함으로써 인해 요구되는 시간 및 비용을 감소시킬 수 있으며. 용체화 처리 및 상온시효 공정 제어를 함으로써 강도 및 연신율의 설계가 가능하다.As described above, according to the present invention, the present process can obtain a required level of strength and elongation even if the artificial aging step is omitted as compared with the general aluminum aging process. Extruded materials have a tensile strength of 650 MPa elongation of 16% and forging materials have a tensile strength of 600 MPa and elongation of 17%. For reference, the tensile strength, yield strength, and elongation requirements for 7075 alloy artificial aging (T6) treated materials are 559 MPa, 500 MPa, and 7% for extruded materials, and 510 MPa, 431 MPa, and 7% for forged materials, respectively. Therefore, when a material of such strength and elongation is required, the use of the alloy according to this process can reduce the time and cost required by performing the existing artificial aging process. It is possible to design strength and elongation by solution treatment and room temperature aging process control.
도 1은 재결정분율 제어 및 자연시효 처리에 의한 강도 및 연신율 증가를 위한 공정의 개략도,
도 2는 스칸듐 첨가 알루미늄 합금의 용체화 처리 이후 재결정 발생 예시도,
도 3은 스칸듐 첨가 알루미늄 합금의 용체화 처리 이후 자연시효에 의한 경도 증가,
도 4는 자연시효 시간에 따른 G.P zone의 생성과 그에 따른 강도 증가와의 상관 관계의 분석,
도 5는 재결정 분율에 따른 항복강도 및 연신율의 변화,
도 6은 알루미늄 7075 제품과 본 공정에 따라 제조된 합금의 기계적 특성 비교 그래프임. 1 is a schematic diagram of a process for increasing strength and elongation by recrystallization fraction control and natural aging treatment,
2 is a view illustrating recrystallization after solution treatment of a scandium-added aluminum alloy;
3 is the hardness increase by natural aging after the solution treatment of the scandium-added aluminum alloy,
4 is an analysis of the correlation between the generation of GP zone and the increase in strength according to the natural aging time,
5 is the change in yield strength and elongation according to the recrystallization fraction,
6 is a graph comparing mechanical properties of aluminum 7075 products and alloys prepared according to the present process.
상기 기술적 과제를 달성하기 위한 본 발명은 Al-Zn-Mg-(Cu)-Sc 합금에서 400~ 500 ℃ 온도 범위에서 용체화 처리를 하여 50~80 % 내외의 재결정이 발생하도록 제어하여, 재료의 연신율을 15% 이상 확보한 후, 이후 자연시효 공정을 통하여, Vacancy-cluster에서 G.P zone이 생성되도록 제어한다. 또한 퀀칭(quenching)은 수냉(water quenching)을 이용하였으며 20~40 ℃ 온도 범위의 상온에서 30시간 이상 유지하여 자연시효가 충분히 일어날 수 있도록 조건을 최적화하였다. 이러한 발명 공정은 이하에서, 본 발명의 바람직한 실시 예를 첨부한 도면들을 참조하여 상세히 설명한다.The present invention for achieving the above technical problem is controlled by the solution treatment in the Al-Zn-Mg- (Cu) -Sc alloy in the temperature range of 400 ~ 500 ℃ to generate a recrystallization of about 50 ~ 80%, After securing 15% or more of elongation, and then through a natural aging process, to control the GP zone to be generated in the Vacancy-cluster. In addition, quenching was used for water quenching, and the conditions were optimized to allow sufficient natural aging to occur at room temperature in the temperature range of 20 to 40 ℃ for more than 30 hours. This invention process is described in detail below with reference to the accompanying drawings, preferred embodiments of the present invention.
도 1은 본 발명 공정의 개략적인 공정도로서 주조 및 균질화 처리가 끝난 제품을 이용 압출 또는 단조등의 2차 가공을 거친 제품을 용체화 처리 - 자연시효의 공정 단계를 거친다. Figure 1 is a schematic process diagram of the process of the present invention is subjected to the process of the solution treatment-spontaneous aging of the product after the secondary processing, such as extrusion or forging, using a product that has been cast and homogenized.
도 2는 본 공정에서 용체화 처리 단계에서 생성된 재결정 영역을 보여주는 그림이다. 본 발명에서 제안한 온도 범위에서 용체화 처리를 통해서 적정 비율의 재결정 분율을 제어해주며 이를 통해 연신율을 확보하여 준다. 2 is a view showing the recrystallized region generated in the solution treatment step in this process. Through the solution treatment in the temperature range proposed by the present invention, the recrystallization fraction of the proper ratio is controlled and thus the elongation is secured.
도 3은 자연시효 시간에 따른 경도 변화를 나타내는 그림으로, 여기에서 A합금: Al-7Zn-2Mg-Cu-0.05Sc, B 합금:Al-7Zn-2Mg-Cu-0.1Sc, C 합금: Al-7Zn-2Mg-Cu-0.2Sc의 조성비이었다. 3 is a diagram showing the change in hardness according to the natural aging time, where A alloy: Al-7Zn-2Mg-Cu-0.05Sc, B alloy: Al-7Zn-2Mg-Cu-0.1Sc, C alloy: Al- It was a composition ratio of 7Zn-2Mg-Cu-0.2Sc.
도 3을 참조하면, 스칸듐의 첨가량이 다른 세 합금을 기준으로 실험하였을 때 세 합금 모두 상온에서 유지하는 시간이 길어질수록 경도가 증가하는 경향을 보였다. 이러한 증가 경향은 대략 70시간을 전후해서 일정 값을 유지하는 것으로 관찰되었다. 따라서 본 발명 합금의 자연시효는 최소 70시간 이상 상온에서 유지하여야 적정 강도에 이를 수 있다. Referring to FIG. 3, when the amount of scandium was tested based on three different alloys, hardness of the three alloys tended to increase as the time maintained at room temperature increased. This increasing tendency was observed to remain constant around 70 hours. Therefore, the natural aging of the alloy of the present invention can be attained at an appropriate strength at least 70 hours at room temperature.
도 4는 자연시효 시 G.P zone 발생량과 경도와의 관계를 분석하기 위해 DSC(Differential Scanning Calorymeter) 열 분석 및 자연시효 시의 경도 변화를 측정한 그래프이다. 여기에서 Hq: 수냉 후 G.P zone 생성에 의한 엔탈피 변화, Ht: t시간 상온시효 후 G.P zone 생성에 의한 엔탈피 변화, △Hv: t시간 상온시효 후 합금의 경도 - 수냉 후 합금의 경도이었다. Figure 4 is a graph measuring the hardness change during the DSC (Differential Scanning Calorymeter) thermal analysis and natural aging in order to analyze the relationship between the generation and hardness of GP zone during natural aging. Where H q : enthalpy change due to GP zone formation after water cooling, H t : enthalpy change due to GP zone generation after room temperature aging, ΔH v : hardness of alloy after room temperature aging for t hour-hardness of alloy after water cooling .
도 4의 결과를 참조하면, 상온시효 시간이 증가함에 따라 G.P zone 형성됨에 따라 열분석 시에는 상온시효 시간이 길어질수록 G.P zone 생성 엔탈피가 감소하며, 경도 증가를 나타내었다. Referring to the results of FIG. 4, as the room temperature aging time is increased, the G.P zone formation enthalpy decreases as the room temperature aging time increases, and the hardness increases.
도 5는 재결정 분율에 따른 항복강도 및 연신율 변화를 나타ㅐㄴ느 그래프이다. 5 is a graph showing the change in yield strength and elongation according to the recrystallization fraction.
도 5를 참조하면, 자연시효(natural aging)시간이 경과함에 따라 연신율이 증가하는 것을 알 수 있다.Referring to FIG. 5, it can be seen that the elongation increases as the natural aging time elapses.
도 6은 본 발명 공정을 통하여 제작된 압출재 및 단조재의 용체화처리 후 자연시효 처리재의 강도와 연신율을 보여주는 그래프이다. 6 is a graph showing the strength and elongation of the natural aging treatment material after the solution treatment of the extruded and forged material produced through the process of the present invention.
도 6을 참조하면, Al-Zn-Mg-Cu-Sc 합금을 이용 , 본 공정단계에 따라서 제작된 재료들의 강도와 연신율 특성은 보통 상용의 7000계열의 합금의 최종 T6처리(인공시효 처리)후의 특성과 항복강도는 유사하나, 연신율 부분에서는 매우 우수하다. 특히 본 발명은 인공시효 단계를 거치지 않고 용체화 처리 및 자연시효 처리를 통해 적정 강도와 연신율을 확보함으로써 인공시효 단계를 거치지 않고 사용할 수 있는 장점을 가지고 있다.Referring to FIG. 6, the strength and elongation characteristics of the materials manufactured according to this process step using Al-Zn-Mg-Cu-Sc alloys are usually measured after the final T6 treatment (artificial aging treatment) of commercially available 7000 series alloys. The properties and yield strengths are similar, but very good in terms of elongation. In particular, the present invention has the advantage that can be used without going through the artificial aging step by securing the appropriate strength and elongation through the solution treatment and natural aging treatment without going through the artificial aging step.
여기서, 상술한 본 발명에서는 바람직한 실시 예를 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자는 하기의 특허청구 범위에 기재된 본 발명의 기술 사항 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경할 수 있음을 이해할 수 있을 것이다.Herein, the present invention described above has been described with reference to a preferred embodiment, but those skilled in the art will variously modify the present invention without departing from the technical matters and scope of the present invention as set forth in the claims below. And can be changed.
Claims (4)
상온에서 유지되는 동안 G.P zone으로 석출되어 강도를 증가시키기 위한 자연시효 단계를 포함하는 것을 특징으로 하는 스칸듐 첨가 알루미늄 합금 제조방법.A solution treatment step for controlling the recrystallization fraction and the amount of vacancy-cluster produced and increasing the elongation after the casting and homogenizing step of Al-Zn- (Mg)-(Cu)-(Zr)-(Ti) -Sc alloy; And
Method for producing a scandium-added aluminum alloy, characterized in that it comprises a natural aging step to increase the strength by being deposited in the GP zone while maintaining at room temperature.
상기 용체화 처리단계는 과포화 고용체 및 재결정분율 제어를 위하여, 300 내지 550 ℃ 온도 범위에서 용체화 처리되는 것을 특징으로 하는 스칸듐 첨가 알루미늄 합금 제조방법.The method according to claim 1,
The solution treatment step is a scandium-added aluminum alloy manufacturing method, characterized in that the solution is subjected to a solution treatment in the temperature range of 300 to 550 ℃ for supersaturated solid solution and recrystallization fraction control.
상기 자연시효 공정은 20 내지 50℃ 범위의 상온에서 1~ 200시간 동안 진행되는 것을 특징으로 하는 스칸듐 첨가 알루미늄 합금 제조방법.The method according to claim 1,
The natural aging process is a scandium-added aluminum alloy manufacturing method, characterized in that proceed for 1 to 200 hours at room temperature in the range of 20 to 50 ℃.
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