中国激光, 2019, 46 (12): 1202006, 网络出版: 2019-12-02   

激光诱导电弧复合增材制造316不锈钢的组织和性能 下载: 1011次

Microstructure and Properties of 316 Stainless Steel Produced by Laser-Induced Arc Hybrid Additive Manufacturing
作者单位
大连理工大学材料科学与工程学院辽宁省先进连接技术重点实验室, 辽宁 大连 116024
摘要
为了改善和提高不锈钢TIG电弧增材制造零件的成形质量和力学性能,加入小功率激光对TIG电弧进行诱导增强,对比激光加入前后的电弧形态,研究不同激光功率下制得的增材制造墙体的抗拉强度及微观组织。结果表明:激光的诱导作用能够压缩电弧,稳定堆积过程,提高堆积速度,实现墙体的低热输入堆积,提高墙体的力学性能;墙体的微观组织主要是柱状树枝晶;热量的积累使得墙体从下到上的枝晶间距逐渐增大,墙体从下到上的硬度值逐渐降低;墙体最顶部为等轴树枝晶;激光诱导电弧复合增材制造的316不锈钢墙体由奥氏体和铁素体组成。
Abstract
A low-power laser is used to induce a TIG arc for improving the surface quality and mechanical properties of the stainless steel components produced via TIG arc additive manufacturing; the arcs before and after laser radiation are compared. Further, the tensile strength and microstructure of the components are investigated at different laser powers. The results denote that the laser induced effect can compress the arc and stabilize the deposition process, resulting in high-speed deposition. The proposed methodology results in low heat input and improves the mechanical properties of the wall. A columnar dendrite microstructure of the wall is considered. The distance between the dendrites from the bottom to the top gradually increases, whereas the hardness decreases. The top of the wall exhibits an equiaxed dendrite microstructure. The 316 stainless steel produced by laser-induced arc additive manufacturing comprises austenite and ferrite.

李旭文, 宋刚, 张兆栋, 刘黎明. 激光诱导电弧复合增材制造316不锈钢的组织和性能[J]. 中国激光, 2019, 46(12): 1202006. Xuwen Li, Gang Song, Zhaodong Zhang, Liming Liu. Microstructure and Properties of 316 Stainless Steel Produced by Laser-Induced Arc Hybrid Additive Manufacturing[J]. Chinese Journal of Lasers, 2019, 46(12): 1202006.

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