激光选区熔化成形Inconel718合金激光重熔工艺研究  

Study on Laser Remelting Process of Inconel718 Nickel Alloy by Selective Laser Melting

作　　者：郭帅东 卢林[1] 吴文恒[1] 王继芬[2] GUO Shuaidong;LU Lin;WU Wenheng;WANG Jifen(Shanghai Research Center of Materials Engineering for Additive Manufacturing,Shanghai Research Institute of Materials,Shanghai 200437,China;School of Resources and Environmental Engineering,Shanghai Polytechnic University,Shanghai 201209,China)

机构地区：[1]上海材料研究所上海3D打印材料工程技术研究中心,上海200437 [2]上海第二工业大学资源与环境工程学院,上海201209

出　　处：《上海第二工业大学学报》2022年第1期51-59,共9页Journal of Shanghai Polytechnic University

基　　金：上海市青年科技启明星计划(20QB1401100)资助。

摘　　要：采用激光选区熔化(selective laser melting,SLM)制备Inconel718合金,研究激光重熔工艺参数(重熔激光功率、重熔扫描速度)对其表面粗糙度、微观组织及力学性能的影响。结果表明:适当提升重熔激光功率可有效改善试样的表面质量、致密度和显微硬度,但过高的重熔激光功率导致孔洞、裂纹增加,晶粒粗化,从而显微硬度降低。在一定范围内,重熔扫描速度的增加会提升试样表面粗糙度和孔隙率,降低显微硬度。重熔激光功率为200 W,重熔扫描速度为960 mm/s时,试样表面粗糙度为2.596μm,孔隙率为0.073%,晶粒尺寸为0.63μm,显微硬度为306.58HV,抗拉强度为1078 MPa,屈服强度为817 MPa,相对最优。The effects of laser remelting process parameters(remelting laser power, remelting scanning speed) on the surface roughness,microstructure and mechanical properties of Inconel718 alloy were investigated by selective laser melting(SLM). The results show that an appropriate increase in remelting laser power can effectively improve the surface quality, density and microhardness of the specimens, while an excessive remelting laser power leads to an increase in holes and cracks, coarsening of grains and thus a decrease in microhardness. Within a certain range, an increase in remelting scan speed will increase the surface roughness and porosity of the specimen and reduce the microhardness. At a remelting laser power of 200 W and a remelting scan speed of 960 mm/s, the specimen have a surface roughness of 2.596 μm, a porosity of 0.073%, a grain size of 0.63 μm, a microhardness of 306.58 HV, a tensile strength of 1 078 MPa and a yield strength of 817 MPa, which are relatively optimal.

关 键 词：激光选区熔化 Inconel 718 激光重熔 显微组织 

分 类 号：TG132.3[一般工业技术—材料科学与工程]