粉末形貌对选区激光熔化316L不锈钢力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.02.031

金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 173-177.DOI: 10.13251/j.issn.0254-6051.2021.02.031

粉末形貌对选区激光熔化316L不锈钢力学性能的影响

张亚民¹, 吴姚莎¹, 杨均宝¹, 刘孝青²

1.中山火炬职业技术学院装备智造学院, 广东中山 528436;
2.广东正德材料表面科技有限公司, 广东中山 528437

收稿日期:2020-07-18 出版日期:2021-02-25 发布日期:2021-05-08
通讯作者: 吴姚莎,副教授,博士,E-mail:547656588@qq.com
作者简介:张亚民(1971—),男,实验师,主要研究方向为金属材料制备、材料表面与界面防护,E-mail:943039087@qq.com。
基金资助:
广东省普通高校青年创新人才类项目(2018GkQNCX058)

Effect of powder morphology on mechanical properties of selective laser melting 316L stainless steel

Zhang Yamin¹, Wu Yaosha¹, Yang Junbao¹, Liu Xiaoqing²

1. Institute of Intelligent Equipment Manufacturing, Zhongshan Torch Polytecnic, Zhongshan Guangdong 528436, China;
2. Gent Materials Surface Technology Guangdong Co., Ltd., Zhongshan Guangdong 528437, China

Received:2020-07-18 Online:2021-02-25 Published:2021-05-08

摘要/Abstract

摘要： 以气雾化316L不锈钢粉为原料,结合等离子球化和选区激光熔化技术制备了不锈钢块体,并用XRD、SEM、激光粒度仪、振实密度仪和万能力学试验机等对等离子球化粉体和选区激光不锈钢块的组织结构和性能进行了表征。结果表明:316L不锈钢粉经等离子球化处理后,不规则扁平状颗粒数量减少,球形颗粒数量增加,振实密度与松装密度的比值(HR值)从1.28减少到1.08,流动性得到明显改善。等离子球化颗粒经SLM成形后的块体物相组成与前驱粉体一致,均为典型的奥氏体不锈钢组织(γ-Fe+α-Fe)。与气雾化块体相比,等离子球化块体力学性能和致密性均有一定程度提高,这主要归因于经等离子球化处理后的前驱粉体致密度提高,球形度增加且流动性良好。

关键词: 316L不锈钢, 等离子球化, 选区激光熔化, 组织结构, 力学性能

Abstract: 316L stainless steel bulk was prepared with aerosolized powders by plasma spheroidization (PS) and selective laser melting (SLM) technologies. The microstructure and mechanical properties of the PS powder and the 316L stainless steel bulk were characterized by XRD, SEM, laser scattering, tap-density tester and universal mechanical testing machine. The results show that the PS powder has more spherical particles and less irregular flat ones than that of the aerosolized powder, and its HR value (the ratio of vibrational density to loose density) reduces from 1.28 to 1.08, which indicating that the fluidity has been improved significantly. The phase composition in the SLM bulk is the same as that of raw material powder, which are typical austenitic stainless steel structure(γ-Fe+α-Fe). Compared with that of the 316L stainless steel bulk prepared by aerosolized powder, the mechanical properties and compactness of the PS bulk have a certain degree of improvement, which mainly due to the higher density of the precursor powder prepared by PS and its increased sphericity and better fluidity.

Key words: 316L stainless steel, plasma spheroidization, selective laser melting, microstructure, mechanical properties

中图分类号:

TG142

张亚民, 吴姚莎, 杨均宝, 刘孝青. 粉末形貌对选区激光熔化316L不锈钢力学性能的影响[J]. 金属热处理, 2021, 46(2): 173-177.

Zhang Yamin, Wu Yaosha, Yang Junbao, Liu Xiaoqing. Effect of powder morphology on mechanical properties of selective laser melting 316L stainless steel[J]. Heat Treatment of Metals, 2021, 46(2): 173-177.

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粉末形貌对选区激光熔化316L不锈钢力学性能的影响

Effect of powder morphology on mechanical properties of selective laser melting 316L stainless steel

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