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热处理对热等静压态TC4合金降温多道次变形微观组织的影响
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中北大学 材料科学与工程学院 山西省 太原市 030051

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国家自然科学基金(51675492)


Effect of heat treatment on microstructure of hot isostatic pressedTC4 alloy under multi-pass deformation
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College of Materials Science and Engineering,North University of China

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    摘要:

    采用Gleeble-1500D热模拟试验机,在应变速率0.001s-1 ~5s-1的条件下对热等静压态TC4合金进行降温多道次热压缩实验,总变形量为70%。热等静压态TC4合金采用935℃+60min+水冷固溶处理,分别在520℃+4/6h+水冷和560℃+4/6h+水冷下进行时效处理;多道次变形后热等静压态TC4合金分别在945℃+60min+水冷进行固溶处理和560℃+6h+水冷进行时效处理。结果表明:热等静压态试样组织随着时效温度的升高,板条状次生α相含量减少;而随着时效时间变长,等轴α相逐渐增多,组织主要以次生条状的α相与等轴α为主。多道次变形态试样,在应变速率为0.1s-1时,合金经过950→850℃降温多道次变形后再通过固溶-时效处理,获得了较为理想的三态组织。

    Abstract:

    The multi-pass thermal compression experiments of hot isostatic pressed TC4 titanium alloy were carried out on the Gleeble-1500D thermal simulator at strain rate of 0.001s-1~5s-1, the total deformation was 70%. The hot isostatic pressed TC4 titanium alloy was treated by 935℃+60 min+water quench solution treatment, and520℃+ 4/6h+water quench and 560+4/6h+water quench aging treatment, respectively. After multi-pass deformation, the samples were treated by solution treatment at 945℃ +60min+water quench and aging treatment at 560℃ +6h+water quench. The results show that the content of secondary α phase of hot isostatic pressed TC4 titanium alloy decreases with the increase of aging temperature, while the equiaxed α phase increases with the increase of aging time, and the microstructure mainly consists of secondary strip α phase and equiaxed α phase. Meanwhile, the ideal tri-modal microstructure(equiaxed α phase + secondary strip α phase + β transformation phase) of hot isostatic pressed TC4 titanium alloy can be obtained by solution and aging treatment during multi-pass deformation at the deformation temperature from 950℃ to 850℃and strain rate of 0.1s-1.

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张治民,刘海军,任璐英,闫江鹏,王强,薛勇.热处理对热等静压态TC4合金降温多道次变形微观组织的影响[J].稀有金属材料与工程,2020,49(4):1372~1378.[Zhang Zhimin, Liu Haijun, Ren Luying, Yan Jiangpeng, Wang Qiang, Xue Yong. Effect of heat treatment on microstructure of hot isostatic pressedTC4 alloy under multi-pass deformation[J]. Rare Metal Materials and Engineering,2020,49(4):1372~1378.]
DOI:10.12442/j. issn.1002-185X.20190565

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  • 收稿日期:2019-07-05
  • 最后修改日期:2019-11-14
  • 录用日期:2019-11-19
  • 在线发布日期: 2020-05-07
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