316L不锈钢的激光粉末床熔融：激光抛光对表面形貌和腐蚀行为的影响

Laser Powder Bed Fusion of 316L Stainless Steel: Effect of Laser Polishing on the Surface Morphology and Corrosion Behavior.

作者信息

Liu Jun, Ma Haojun, Meng Lingjian, Yang Huan, Yang Can, Ruan Shuangchen, Ouyang Deqin, Mei Shuwen, Deng Leimin, Chen Jie, Cao Yu

机构信息

Zhejiang Provincial Key Laboratory of Laser Processing Robotics, College of Mechanical & Electrical Engineering, Wenzhou University, Wenzhou 325035, China.

Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China.

出版信息

Micromachines (Basel). 2023 Apr 14;14(4):850. doi: 10.3390/mi14040850.

DOI:10.3390/mi14040850

PMID:37421082

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10145978/

Abstract

Recently, laser polishing, as an effective post-treatment technology for metal parts fabricated by laser powder bed fusion (LPBF), has received much attention. In this paper, LPBF-ed 316L stainless steel samples were polished by three different types of lasers. The effect of laser pulse width on surface morphology and corrosion resistance was investigated. The experimental results show that, compared to the nanosecond (NS) and femtosecond (FS) lasers, the surface material's sufficient remelting realized by the continuous wave (CW) laser results in a significant improvement in roughness. The surface hardness is increased and the corrosion resistance is the best. The microcracks on the NS laser-polished surface lead to a decrease in the microhardness and corrosion resistance. The FS laser does not significantly improve surface roughness. The ultrafast laser-induced micro-nanostructures increase the contact area of the electrochemical reaction, resulting in a decrease in corrosion resistance.

摘要

近年来，激光抛光作为激光粉末床熔融（LPBF）制造金属零件的一种有效后处理技术，受到了广泛关注。本文采用三种不同类型的激光对LPBF制备的316L不锈钢样品进行抛光。研究了激光脉冲宽度对表面形貌和耐蚀性的影响。实验结果表明，与纳秒（NS）激光和飞秒（FS）激光相比，连续波（CW）激光实现的表面材料充分重熔显著改善了粗糙度。表面硬度增加，耐蚀性最佳。NS激光抛光表面的微裂纹导致显微硬度和耐蚀性降低。FS激光对表面粗糙度的改善不明显。超快激光诱导的微纳结构增加了电化学反应的接触面积，导致耐蚀性降低。