Microstructure and mechanical properties of 316L stainless steel manufactured by multi-laser selective laser melting (SLM)

选择性激光熔化 材料科学 微观结构 激光器 压痕硬度 单晶 多孔性 复合材料 延伸率 Crystal(编程语言) 选择性激光烧结 激光扫描 冶金 极限抗拉强度 光学 结晶学 烧结 物理 程序设计语言 化学 计算机科学
作者
Lin Zhao,Jianfeng Zhang,Jinlei Yang,Juan Hou,Jianjian Li,Jun Lin
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier BV]
卷期号:913: 147053-147053 被引量:3
标识
DOI:10.1016/j.msea.2024.147053
摘要

The microstructure and mechanical properties of 316L stainless steel samples manufactured by dual-laser selective laser melting technology, were investigated in compare with that of the single-laser scanning samples. It was found that the porosity of the dual-laser overlap samples was lower than that of single laser forming samples due to the different laser energy density absorbed by the powders. Furthermore, it was found that the crystal structure and crystal orientation of both zones were similar. From the TEM observation, it was noted that the number density of nano-oxides in the overlap zone was higher than that in the single laser forming zone. This reason was suggested as the difference of the oxygen content inside the melt pool during the forming process. The strength and microhardness of the single-laser samples was lower than that of the dual-laser overlap samples, but the elongation was higher. By analyzing the strengthening mechanism, it was revealed that Orowan strengthening was the main reason for the difference. These results could guide the large-size component manufactured using the muti-laser selective laser melting technology.
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