热处理对SLM 316L不锈钢螺旋微丝微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.07.020

金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 103-107.DOI: 10.13251/j.issn.0254-6051.2021.07.020

热处理对SLM 316L不锈钢螺旋微丝微观组织和力学性能的影响

李斌¹, 董秀萍¹, 黄明吉²

1.北京工商大学人工智能学院, 北京 100048;
2.北京科技大学机械工程学院, 北京 100083

收稿日期:2021-01-27 出版日期:2021-07-25 发布日期:2021-12-10
通讯作者: 董秀萍,副教授,E-mail:dongxp@th.btbu.edu.cn
作者简介:李斌(1996—),男,硕士研究生,主要研究方向为金属橡胶三维建模,E-mail:libin@st.btbu.edu.cn。
基金资助:
国家自然科学基金(51975042);北京科技大学顺德研究生院科技创新专项资金(BK19AE007)

Effect of heat treatment on microstructure and mechanical properties of SLM 316L stainless steel spiral microwire

Li Bin¹, Dong Xiuping¹, Huang Mingji²

1. School of Artificial Intelligence, Beijing Technology and Business University, Beijing 100048, China;
2. School of MechanicalEngineering,University of Science and Technology Beijing, Beijing 100083, China

Received:2021-01-27 Online:2021-07-25 Published:2021-12-10

摘要/Abstract

摘要： 通过显微镜观察、拉伸试验和显微硬度试验分析了不同热处理参数对激光熔化(SLM)制成的螺旋微直径丝(SS316L-HMDW)的组织和力学性能的影响。结果表明:热处理后,SS316L-HMDW试样的微观组织发生明显变化,激光熔池消失,各向异性减小,力学性能提升;在不同保温时间下,SS316L-HMDW试样的晶粒尺寸随保温时间有不同程度地增加;随着热处理保温时间的增加,SS316L-HMDW试样的屈服极限和抗拉强度降低,伸长率增加,拉伸试样的断裂表面均为延性断裂,凹坑变大。经1200 ℃保温2 h热处理后,SS316L-HMDW试样的组织和力学性能均有显著变化,抗拉强度由585 MPa降低至398 MPa,屈服强度由40 MPa降低至25 MPa,伸长率明显增加至268%,试样的可塑性和韧性得到了增强。

关键词: 选择性激光熔融技术, 螺旋微丝, 热处理, 微观组织, 力学性能

Abstract: Effects of different heat treatment parameters on the structure and mechanical properties of the spiral micro-diameter wire (SS316L-HMDW) made by laser melting (SLM) were analyzed through microscope observation, tensile test and microhardness test. The results show that after heat treatment, microstructure of the SS316L-HMDW specimen changes significantly, and the laser melt pool disappears, which reduces the anisotropy and contributes to the improvement of mechanical properties. Under different holding time, the grain size of the SS316L-HMDW specimen increases in different degrees with the holding time; with the increase of heat treatment holding time, the yield limit and tensile strength of the SS316L-HMDW specimen decreases, the elongation increases, and all of the fracture surfaces of tensile test specimens are ductile fracture, and the dimples become larger. After heat treatment at 1200 ℃ for 2 h, the microstructure and mechanical properties of the SS316L-HMDW specimen change significantly. The tensile strength decreases from 585 MPa to 398 MPa, the yield strength decreases from 40 MPa to 25 MPa, and the elongation significantly increases to 268%. The plasticity and toughness of the specimens are enhanced.

Key words: selective laser melting, helical micro-diameter wire, heat treatment, microstructure, mechanical properties

中图分类号:

TG166

李斌, 董秀萍, 黄明吉. 热处理对SLM 316L不锈钢螺旋微丝微观组织和力学性能的影响[J]. 金属热处理, 2021, 46(7): 103-107.

Li Bin, Dong Xiuping, Huang Mingji. Effect of heat treatment on microstructure and mechanical properties of SLM 316L stainless steel spiral microwire[J]. Heat Treatment of Metals, 2021, 46(7): 103-107.

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热处理对SLM 316L不锈钢螺旋微丝微观组织和力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of SLM 316L stainless steel spiral microwire

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