HIP温度对SLM制备TC4钛合金组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.06.027

金属热处理 ›› 2022, Vol. 47 ›› Issue (6): 138-142.DOI: 10.13251/j.issn.0254-6051.2022.06.027

HIP温度对SLM制备TC4钛合金组织和力学性能的影响

吕周晋¹, 李好峰¹, 车立达¹, 吴战芳¹, 翟一多¹, 崔晓敏¹, 李向阳²

1.钢研昊普科技有限公司, 北京 100081;
2.中国钢研科技集团有限公司, 北京 100081

收稿日期:2022-03-03 修回日期:2022-05-01 出版日期:2022-06-25 发布日期:2022-07-05
通讯作者: 车立达,高级工程师,博士,E-mail:chelida@hipex.cn
作者简介:吕周晋(1983—),男,工程师,硕士,主要研究方向为粉末冶金、热等静压技术,E-mail:lvzhoujin@hipex.cn。

Effect of HIP temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by SLM

Lü Zhoujin¹, Li Haofeng¹, Che Lida¹, Wu Zhanfang¹, Zhai Yiduo¹, Cui Xiaomin¹, Li Xiangyang²

1. Cisri Hipex Technology Co., Ltd., Beijing 100081, China;
2. China Iron & Steel Research Institute Group, Beijing 100081, China

Received:2022-03-03 Revised:2022-05-01 Online:2022-06-25 Published:2022-07-05

摘要/Abstract

摘要： 以激光选区熔化技术(SLM)成型TC4钛合金为研究对象,通过光学显微镜(OM)、扫描电镜(SEM)和电子万能试验机等测试分析方法,研究了热等静压处理温度对TC4钛合金材料微观组织和力学性能的影响。结果表明,SLM态TC4钛合金横截面微观组织由等轴状初生β晶粒组成,纵截面微观组织由呈外延生长的柱状初生β晶粒组成。晶粒内部以不同取向的针状α'马氏体相为主,纳米点状β相在初生马氏体间形核生长。在α+β两相区温度进行热等静压处理,TC4钛合金的组织由α相和β相组成。随着热等静压处理温度的升高,板条状α相粗化成短棒状,β相含量增加且发生一定粗化。随着热等静压处理温度的升高,材料的抗拉强度和屈服强度呈现降低的趋势,断面收缩率也呈下降趋势。热等静压处理工艺为910 ℃-110 MPa-2 h的TC4钛合金可获得最优的强韧性匹配。

关键词: 热等静压, 激光选区熔化, TC4钛合金, 微观组织, 力学性能

Abstract: Using optical microscope (OM), scanning electron microscope (SEM) and electronic universal testing machine, the effect of hot isostatic pressing (HIP) temperature on the microstructure and mechanical properties of the TC4 titanium alloy formed by laser selective melting (SLM) was investigated. The results show that the cross section microstructure of the TC4 titanium alloy by SLM is composed of equiaxed primary β grains, the longitudinal section microstructure is composed of columnar primary β grains with epitaxial growth. The inside of the grains is dominated by acicular α' martensite phases with different orientations, nano-dot β phase nucleates and grows between the primary martensite. The structure of the TC4 titanium alloy is composed of α phase and β phase when HIP is performed at temperature of the α+β phase region. With the increase of HIP temperature, the lath α-phase coarsens into short rod, the content of β phase increases and coarsens, the tensile strength and yield strength of TC4 shows a decreasing trend, section shrinkage also shows a decreasing trend. When HIP at 910 ℃ with a pressure of 110 MPa for 2 h, the TC4 titanium alloy obtains the best matching of strength and toughness.

Key words: hot isostatic pressing, selective laser melting, TC4 titanium alloy, microstructure, mechanical properties

中图分类号:

TG166.5

吕周晋, 李好峰, 车立达, 吴战芳, 翟一多, 崔晓敏, 李向阳. HIP温度对SLM制备TC4钛合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(6): 138-142.

Lü Zhoujin, Li Haofeng, Che Lida, Wu Zhanfang, Zhai Yiduo, Cui Xiaomin, Li Xiangyang. Effect of HIP temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by SLM[J]. Heat Treatment of Metals, 2022, 47(6): 138-142.

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HIP温度对SLM制备TC4钛合金组织和力学性能的影响

Effect of HIP temperature on microstructure and mechanical properties of TC4 titanium alloy prepared by SLM

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