摘要
采用光学显微镜和电子背散射衍射技术(electron backscattered diffraction,EBSD),观察分析了激光选区熔化(selective laser melting,SLM)快速成形工艺在不同扫描角度下316L不锈钢的显微组织和晶体取向,研究了扫描角度与熔池生成、凝固的关系,以及与拉伸强度和延伸率的关系。结果表明,晶体的各向异性随激光扫描角度的变化而变化,扫描角度直接影响获得的熔池的稳定性和凝固过程中的温度梯度,同时也进一步影响最终晶体的均匀性,从而导致制件拉伸强度、延伸率发生变化。因此,可以通过改变扫描方向的角度来控制成形件的结构和力学性能。
The optical microscope and electron backscattered diffraction(EBSD) technology were used to observe and analyze the microstructure and crystal orientation of 316 L stainless steel under different scanning angles of selective laser melting(SLM). The relationship between scanning angle and molten pool formation, solidification, tensile strength and elongation was studied. The results show that the anisotropy of the crystal changes with the laser scanning angle. The scanning angle directly affects the stability of the obtained molten pool and the temperature gradient during solidification, and also further affects the uniformity of the final crystal. The results shows that the tensile strength and elongation of the workpiece changed. Therefore, the structure and mechanical properties of the shaped part can be controlled by changing the angle of the scanning direction.
作者
宗学文
王磊
高倩
刘文杰
周宏志
Zong Xuewen;Wang Lei;Gao Qian;Liu Wenjie;Zhou Hongzhi(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;College of Mechanical Engineering,Hunan Institute of Science and Technology,Yueyang,Hunan 414000,China)
出处
《应用激光》
CSCD
北大核心
2021年第3期421-430,共10页
Applied Laser
基金
国家自然科学基金(51875452)
陕西省重点研发计划项目(2019GY-102)。
