Effects of Heat Treatment on the Microstructure Evolution and Mechanical Properties of Selective Laser Melted TC4 Titanium Alloy

被引：35

作者：

Liu, Xiaohang ^{[1
,2
]}

Cui, Wanqi ^{[1
,2
]}

Wang, Yunru ^{[1
,2
]}

Long, Yihao ^{[1
,2
]}

Liu, Fulin ^{[1
,2
]}

Liu, Yongjie ^{[1
,2
]}

机构：

[1] Sichuan Univ, Failure Mech & Engn Disaster Prevent Key Lab Sich, Chengdu 610207, Peoples R China

[2] Sichuan Univ, Coll Architecture & Environm, MOE Key Lab Deep Earth Sci & Engn, Chengdu 610065, Peoples R China

来源：

METALS | 2022年 / 12卷 / 05期

关键词：

additive manufacturing; selective laser melted; Ti-6Al-4V; microstructure evolution; mechanical properties; heat treatment; ADDITIVELY MANUFACTURED TI-6AL-4V; FATIGUE PERFORMANCE; FRACTURE-TOUGHNESS; TI6AL4V ALLOY; TEMPERATURE; PARAMETERS; BEHAVIOR;

D O I：

10.3390/met12050702

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of heat treatments on microstructure and basic mechanical properties of selective laser melted (SLM) TC4 titanium alloy were investigated in detail. The results demonstrated that a lot of acicular alpha/alpha ' and beta phases exist in the SLM TC4 titanium alloy. With the increase in the aging treatment temperature, the metastable alpha ' phase of SLM TC4 was decomposed into alpha + beta laths. Moreover, the alpha/alpha ' phase and beta phase grew coarser, leading to a gradual decrease in strength, that is, plasticity and hardness increased and decreased, respectively. In terms of solid-solution aging treatment, the beta phase was transformed into the alpha ' martensite phase in the solid-solution treatment, and the aging treatment induced the decomposition of the metastable alpha ' phase into alpha + beta laths. The strength and hardness of SLM TC4 alloy increased as the temperature increased. The optimal mechanical properties could be obtained by water quenching after holding at 960 celcius for 1 h and then air cooling after holding at 600 degrees C for 8 h.

引用

页数：16

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