固溶时效处理对Ti-5322钛合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.12.005

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 24-28.DOI: 10.13251/j.issn.0254-6051.2020.12.005

固溶时效处理对Ti-5322钛合金组织与性能的影响

王安东, 张禄祥, 陈彩凤, 毛勇全, 倪磊

江苏大学材料科学与工程学院, 江苏镇江 212013

收稿日期:2020-07-15 出版日期:2020-12-25 发布日期:2021-01-14
作者简介:王安东(1975—),男,副教授,主要研究方向为高性能金属材料,E-mail:wadujs@163.com
基金资助:
国家自然科学基金(51102118); 江苏省科技支撑项目(重点项目)(BE2014007-1,BE2014007-4)

Effect of solution and aging treatment on microstructure and tensile properties of Ti-5322 alloy

Wang Andong, Zhang Luxiang, Chen Caifeng, Mao Yongquan, Ni Lei

School of Materials Science and Engineering, Jiangsu University, Zhengjiang Jiangsu 212013, China

Received:2020-07-15 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 通过对Ti-5322合金板材进行固溶时效处理,发现在相变点以下的α+β两相区温度固溶时,初生α相随固溶温度的升高而减少,β相所占体积分数升高;在相变点以上的β单相区温度固溶时,初生α相全部溶入β基体之中,温度越高,晶粒越粗大。在510~590 ℃时效处理过程中,细小弥散的板条状次生α相在β基体内析出,起到了析出强化作用,且随着时效温度的升高,次生α相长大,所占体积分数减少,导致合金的强度下降,塑性升高。对Ti-5322合金热处理后的试样进行室温拉伸试验,发现与β单相区温度固溶时效相比,合金在α+β两相区温度固溶及不同温度时效处理后强度与塑性的匹配更加优良,因此选择在两相区进行固溶处理是最合适的,最佳工艺为870 ℃×1 h固溶+550 ℃×6 h时效。

关键词: Ti-5322钛合金, 固溶处理, 时效强化

Abstract: Through solution and aging treatment, the microstructure and tensile properties of Ti-5322 alloy were studied. The results show that when the solution treatment temperature is below the transformation point, the primary α phase decreases with the increase of solution treatment temperature, and the volume fraction of the β phase increases. When the solution treatment temperature is above the transformation point, the primary α phase is completely dissolved into the β phase, and the higher the temperature, the coarser the grains. During the aging at 510-590 ℃, the secondary α phase plates precipitate in the β matrix, which plays a precipitation strengthening role. As the aging temperature increases, the secondary α phase grows up and its volume fraction is reduced, leading to a decrease in the strength and an increase in the plasticity of the alloy. The room temperature tensile test shows that compared with the solution treatment in β single-phase region then aging, the strength and plasticity of the alloy are more excellent after solution treatment in the α+β two-phase region and aging, so it is most suitable to select the solution treatment in the two-phase region, and the optimum process is solution at 870 ℃ for 1 h and aging at 550 ℃ for 6 h.

Key words: Ti-5322 alloy, solution treatment, aging strengthening

中图分类号:

TG146.2

王安东, 张禄祥, 陈彩凤, 毛勇全, 倪磊. 固溶时效处理对Ti-5322钛合金组织与性能的影响[J]. 金属热处理, 2020, 45(12): 24-28.

Wang Andong, Zhang Luxiang, Chen Caifeng, Mao Yongquan, Ni Lei. Effect of solution and aging treatment on microstructure and tensile properties of Ti-5322 alloy[J]. Heat Treatment of Metals, 2020, 45(12): 24-28.

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固溶时效处理对Ti-5322钛合金组织与性能的影响

Effect of solution and aging treatment on microstructure and tensile properties of Ti-5322 alloy

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