中国激光, 2017, 44 (9): 0902001, 网络出版: 2017-09-07   

激光选区熔化成形TC4钛合金热处理后微观组织和力学性能 下载: 1600次

Microstructure and Mechanical Properties of TC4 Titanium Alloy Formed by Selective Laser Melting After Heat Treatment
肖振楠 1,2,*刘婷婷 1,2廖文和 1,2张长东 1,2杨涛 1,2
作者单位
1 南京理工大学机械工程学院, 江苏 南京 210094
2 南京理工大学数控成形技术与装备国家地方联合实验室, 江苏 南京 210094
摘要
研究了退火、两相区固溶、固溶时效三种热处理方法对激光选区熔化(SLM)技术成形TC4钛合金微观组织和力学性能的影响。结果表明, 在SLM成形TC4钛合金中形成了细针状马氏体组织, 几乎不存在β相, 强度较高, 塑性较差; 经过840 ℃/2 h/空冷(AC)退火处理后, TC4钛合金的显微组织由(α+β)相构成, 具有较高的强度和塑性; 经过940 ℃/1 h/水淬(WQ)固溶处理后, β相的含量增加, 晶粒长大, 形成交错的(α+β)网篮组织, 强度明显下降, 塑性提高; 经过940 ℃/1 h/WQ+540 ℃/4 h/AC固溶时效处理后, 形成了均匀弥散的(α+β)相, α相粗化, 强度降低, 塑性小幅提高。TC4钛合金经过热处理后, 内部残余应力减小, 变形开裂倾向降低。采用840 ℃/2 h/AC退火处理工艺, 可使SLM成形TC4钛合金获得较佳的强度/塑性匹配。
Abstract
The effects of three heat treatment methods which include annealing, solution hardening of two-phase regions, and solution and aging treatment on the microstructure and mechanical properties of TC4 titanium alloy formed by selective laser melting (SLM) are investigated. The results show that the fine acicular martensite is formed in the TC4 titanium alloy formed by SLM and there is nearly no β phase, which makes the TC4 titanium alloy have high strength and poor plasticity. After the 840 ℃/2 h/air-cooling (AC) annealing, the microstructure of TC4 titanium alloy is consisted of (α+β) phases, which makes TC4 titanium alloys have better strength and plasticity. After the 940 ℃/1 h/water-quenching (WQ) solution hardening, the staggered basket-weave (α+β) microstructure is obtained in TC4 titanium alloys, the strength decreases significantly and the plasticity increases because of the increase of β phase content and grain size. After 940 ℃/1 h/WQ+540 ℃/4 h/AC solution and aging heat treatment, the (α+β) phases are formed and uniformly dispersed, and the α phase coarsens, which result in the decrease of strength and the slight increase of plasticity. After heat treatment, the residual stress and the tendency of the strain cracking of TC4 titanium alloy decrease. The better strength/plasticity matching of TC4 titanium alloy formed by SLM can be obtained by the annealing heat treatment of 840 ℃/2 h/AC.

肖振楠, 刘婷婷, 廖文和, 张长东, 杨涛. 激光选区熔化成形TC4钛合金热处理后微观组织和力学性能[J]. 中国激光, 2017, 44(9): 0902001. Xiao Zhennan, Liu Tingting, Liao Wenhe, Zhang Changdong, Yang Tao. Microstructure and Mechanical Properties of TC4 Titanium Alloy Formed by Selective Laser Melting After Heat Treatment[J]. Chinese Journal of Lasers, 2017, 44(9): 0902001.

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