(1. 南昌航空大學 材料科學與工程學院，南昌 330063； 2. 澳大利亞國立大學 工程與計算機技術(shù)學院，堪培拉 2601； 3. 上海飛機制造有限公司 航空制造技術(shù)研究所，上海 201324)
摘 要: 研究激光3D打印80Ni20Cr合金的層-層正交和層-層同向兩種不同層激光加工路徑打印的合金樣件微結(jié)構(gòu)和力學性能。結(jié)果表明：合金樣件具有細小的等軸晶組織和柱狀晶組織，柱狀晶粒沿著激光加工路徑生長。合金樣件成分為Cr溶質(zhì)溶于Ni溶劑的固溶體，打印樣件密度與理論密度接近。層-層正交工藝打印合金樣件的孔隙率要低于層-層同向工藝打印合金樣件的，微觀硬度和拉伸性能也要優(yōu)于采用層-層同向工藝打印合金樣件的，其抗拉強度可達410 MPa，硬度可達406 HV0.2。
關(guān)鍵字: 3D打印；80Ni20Cr合金；微結(jié)構(gòu)；力學性能；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
