激光功率对SLM增材制造316不锈钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.01.024

金属热处理 ›› 2024, Vol. 49 ›› Issue (1): 154-159.DOI: 10.13251/j.issn.0254-6051.2024.01.024

激光功率对SLM增材制造316不锈钢组织与性能的影响

宋涛^1,2, 李子瑶¹, 彭雅芳¹, 王志武²

1. 湖北大学知行学院机械与自动化学院, 湖北武汉 430011;
2. 武汉大学机械与自动化学院, 湖北武汉 430072

收稿日期:2023-08-18 修回日期:2023-11-20 发布日期:2024-02-29
通讯作者: 王志武,教授,博士, E-mail:wzw1618@163.com
作者简介:宋涛(1989—),男,讲师,主要研究方向为金属材料组织性能分析,E-mail:songtao185880@163.com。
基金资助:
湖北省教育厅科学研究计划指导性项目(B2021409)

Effect of laser power on microstructure and properties of SLM additive manufactured 316 stainless steel

Song Tao^1,2, Li Ziyao¹, Peng Yafang¹, Wang Zhiwu²

1. College of Machinery and Automation, Zhixing College of Hubei University, Wuhan Hubei 430011, China;
2. School of Power and Mechanical Engineering, Wuhan University, Wuhan Hubei 430072, China

Received:2023-08-18 Revised:2023-11-20 Published:2024-02-29

摘要/Abstract

摘要： 利用不同激光功率的选择性激光熔化(SLM)增材制造技术制备了316不锈钢试样,利用光学显微镜、电子背散射衍射(EBSD)、维氏硬度计等分析了试样的晶体学特征和硬度。结果表明,随着激光功率的降低,试样析出相数量呈下降趋势,但输入能量低,熔池冷却速率高,枝晶的临界形核半径小,凝固时的形核率及形核数量高,有利于晶粒细化和等轴晶的生成,表现出高硬度。高激光功率下试样表现出高取向度的纤维织构,而低功率下表现出低取向度的立方织构。激光功率为320 W时,试样的主要织构为{110}<110>和{112}<111>;激光功率为290 W时,试样的主要织构为{112}<110>和{112}<111>;激光功率为260 W时,试样的主要织构为{001}<110>。

关键词: 增材制造, 316不锈钢, 激光功率, EBSD

Abstract: Specimens of 316 stainless steel were prepared by selective laser melting additive manufacturing technology under different laser powers. The crystallographic characteristics and hardness of the steel specimens were analyzed by means of OM, EBSD and Vickers hardness tester. The results show that with the decrease of laser power, the amount of precipitated phase decreases, but the input energy during manufacturing is low, the cooling rate of molten pool is high, the critical nucleation radius of dendrite is small, the nucleation rate and the number of nucleation are high during solidification, which is conducive to the grain refinement and the formation of equiaxial crystal, showing a high hardness value. The steel shows fiber texture with high degree of orientation under high laser power, while cube texture with low degree of orientation under low laser power. The main texture of the steel under laser power of 320 W is {110}<110> and {112}<111>, that under laser power of 290 W is {112}<110> and {112}<111>, and that under laser power of 260 W is {001}<110>.

Key words: additive manufacturing, 316 stainless steel, laser power, electron backscattered diffraction

中图分类号:

TG249

宋涛, 李子瑶, 彭雅芳, 王志武. 激光功率对SLM增材制造316不锈钢组织与性能的影响[J]. 金属热处理, 2024, 49(1): 154-159.

Song Tao, Li Ziyao, Peng Yafang, Wang Zhiwu. Effect of laser power on microstructure and properties of SLM additive manufactured 316 stainless steel[J]. Heat Treatment of Metals, 2024, 49(1): 154-159.

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激光功率对SLM增材制造316不锈钢组织与性能的影响

Effect of laser power on microstructure and properties of SLM additive manufactured 316 stainless steel

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