(1. 南昌航空大学 材料科学与工程学院，南昌 330063； 2. 澳大利亚国立大学 工程与计算机技术学院，堪培拉 2601； 3. 上海飞机制造有限公司 航空制造技术研究所，上海 201324)
摘 要: 研究激光3D打印80Ni20Cr合金的层-层正交和层-层同向两种不同层激光加工路径打印的合金样件微结构和力学性能。结果表明：合金样件具有细小的等轴晶组织和柱状晶组织，柱状晶粒沿着激光加工路径生长。合金样件成分为Cr溶质溶于Ni溶剂的固溶体，打印样件密度与理论密度接近。层-层正交工艺打印合金样件的孔隙率要低于层-层同向工艺打印合金样件的，微观硬度和拉伸性能也要优于采用层-层同向工艺打印合金样件的，其抗拉强度可达410 MPa，硬度可达406 HV0.2。
关键字: 3D打印；80Ni20Cr合金；微结构；力学性能；孔隙率
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China; 2. College of Engineering and Computer Science, Australian National University, Canberra 2601, Australia; 3. Aeronautical Manufacturing Technology Research Institute, Shanghai Aircraft Manufacturing Co., Shanghai 201324, China）
Abstract:80Ni20Cr alloy was manufactured by laser 3D printing technology using two different laser 3D printing routes, namely, layer-layer orthogonal and layer-layer with the same direction, and the microstructure and mechanical properties of 80Ni20Cr alloy were also studied. The results show that the microstructures of alloy components present small lamellar grains and columnar grains, and the columnar grains grow along the path of laser 3D printing route. The composition of the alloy components is Ni-Cr solid solution based Ni solvent. Moreover, the density of 80Ni20Cr alloy manufactured by laser 3D printing is close to the theoretical density of alloy. The porosity of 80Ni20Cr alloy fabricated by laser 3D printing technology using layer-layer orthogonal route is lower than that of layer-layer with the same direction, meanwhile, the average micro-hardness and tensile properties of 80Ni20Cr alloy components using layer-layer orthogonal route are also higher than that of using layer-layer with the same direction, and the tensile strength of alloy reaches up to 410 MPa, the hardness of alloy reaches up to 406 HV0.2.
Key words: 3D printing; 80Ni20Cr alloy; microstructure; mechanical properties; porosity
