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Ti-6Al-4V合金不同工艺条件下水冷过程中的组织演变
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作者单位:

1.沈阳航空航天大学;2.沈阳理工大学

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基金项目:

国家 863 项目 (2015AA03A501) 和辽宁省科技厅项目 (2015020189)


Microstructural evolution during water cooling after different processing conditions in Ti-6Al-4V alloy
Author:
Affiliation:

1.Shenyang Aerospace University;2.Shenyang Ligong University

Fund Project:

the National 863 project of China (2015AA03A501) and Liaoning Provincial Science and Technology Plan Project (2015020189)

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    摘要:

    了解Ti-6Al-4V合金不同工艺条件下水冷过程中的组织演变,以便获得最佳力学性能是非常重要的。使用热模拟机对Ti-6Al-4V合金进行了热模拟。结果表明,固溶处理后获得了全部马氏体组织。固溶后水冷,由于α′和 α″的存在,造成了硬度增加。当试样在850℃等温水冷后获得了层片状组织,硬度进一步增加。当试样在850℃变形后水冷,等轴的组织出现了,由于晶界强化的缘故,硬度达最高值(Hv584)。当试样在850℃变形后经过600℃等温水冷后,组织由α相、层片状α/β和等轴的组织构成。变形后的冷却和等温造成了α相宽度和等轴组织的增加。等轴晶粒在324-706 nm的范围内。这造成了硬度的降低。

    Abstract:

    It is important to understand the microstructural evolution during water quenching after different processing conditions in order to obtain optimum mechanical properties of Ti-6Al-4V alloy. The thermal simulation of Ti-6Al-4V alloy was conducted using a thermomechanical simulator. The results have shown that a fully martensitic microstructure was obtained after solution treatment. Water-quenching after solution resulted in hardness increase, and this was attributed to the presence of α′ and α″. The lamellar structure formed when the specimen was water-quenched after isothermal holding at 850℃, and the hardness further increased. Colony appeared after deformation at 850℃ subsequent water quenching, and the hardness reached the maximum value (Hv584). This was attributed to the grain boundaries strengthening. The microstructure composed of α phase, lamellar colonies α/β and colony when the specimen was isothermal held at 600℃ after deformation at 850℃. Cooling and isothermal holding after deformation resulted in an increase of the width of α phase and colony. It offered a range of 324-706 nm for equiaxed grains. This resulted in the hardness decrease.

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张润奇,蔡一钦,李壮,李晋宇,周琦,崔席俊. Ti-6Al-4V合金不同工艺条件下水冷过程中的组织演变[J].稀有金属材料与工程,2020,49(9):3005~3011.[Run-qi Zhang, Yi-qin Cai, Zhuang Li, Jin-yu Li, Qi Zhou, Xi-jun Cui. Microstructural evolution during water cooling after different processing conditions in Ti-6Al-4V alloy[J]. Rare Metal Materials and Engineering,2020,49(9):3005~3011.]
DOI:10.12442/j. issn.1002-185X.20190615

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  • 收稿日期:2019-07-23
  • 最后修改日期:2019-10-10
  • 录用日期:2019-10-11
  • 在线发布日期: 2020-10-15
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