中国激光, 2011, 38 (1): 0103001, 网络出版: 2010-12-14
不锈钢薄壁零件选区激光熔化制造及影响因素研究 下载: 532次
Study on Process and Effective Factors of Stainless Steel Thin-Wall Parts Manufactured by Selective Laser Melting
摘要
为了实现薄壁零件的快速制造,在快速成型设备Dimetal-280上进行了选区激光熔化(SLM)成型工艺实验研究,分析了SLM中不同激光功率、扫描速度、铺粉装置、离焦量和层厚对成型效果的影响,在实验中获得了优化的工艺参数,并成型了变截面的薄壁零件,零件致密度达96.95%。在扫描电镜下观察了零件的表面及侧面,结果表明其层与层之间熔合良好;分析表明成型设备成型零件壁厚的绝对误差极限值在20 μm左右;薄壁零件顶部壁宽为101.3 μm,底部壁宽为142.0 μm,与设计值相差分别为21.3 μm和22.0 μm,与极限值相吻合;拉伸测试表明,抗拉强度范围为465~625 MPa,屈服强度范围为390~515 MPa,延伸率范围为23%~48%。
Abstract
For the rapid manufacturing of thin-wall parts, the process experiments of selective laser melting (SLM) have been carried out on Dimetal-280 system. The influence factors such as laser power, scanning speed, powder preparing setting, defocus length and powder layer thickness are experimented and analyzed, then a group of optimal process parameters have been gotten. In the experiment, a variable cross-section thin-wall part with density of 96.95% has been produced. The result shows that the metallurgical bonding layer by layer is excellent in the thin-wall part when investigated in scanning electron microscope; It is shown that the minimum absolute error in the wall thickness of manufacturing parts using the SLM equipment is about 20 μm. The top and bottom thickness of the SLM part wall are 101.3 and 142.0 μm, respectively, and the differences between designed and SLM part are 21.3 and 22.0 μm, respectively, which are identical with the minimum absolute error. Tensile strength test shows that the tensile strength is 465~625 MPa, yield strength is 390~515 MPa, and elongation is 23%~48%.
杨永强, 罗子艺, 苏旭彬, 王迪. 不锈钢薄壁零件选区激光熔化制造及影响因素研究[J]. 中国激光, 2011, 38(1): 0103001. Yang Yongqiang, Luo Ziyi, Su Xubin, Wang Di. Study on Process and Effective Factors of Stainless Steel Thin-Wall Parts Manufactured by Selective Laser Melting[J]. Chinese Journal of Lasers, 2011, 38(1): 0103001.