文献类型：会议论文

英文题名：Effect of laser parameters on the mechanical properties of in situ synthesized TiN/Ti₃Al composite coatings on Ti6Al4V

作者：Liu, Zhengdao[1];Xu, Jinsha[1];Zhang, Xiancheng[1];Xuan, Fu-Zhen[1];Wang, Zhengdong[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

会议论文集：International Symposium on Structural Integrity (ISSI2011)

会议日期：OCT 27-30, 2011

会议地点：Hefei, PEOPLES R CHINA

语种：英文

外文关键词：Composite coating; Laser nitriding; Microhardness; Elastic modulus; Fracture toughness

摘要：A novel method was developed to synthesize the TiN reinforced Ti3Al intermetallic matrix composite (IMC) coatings on Ti6Al4V substrate. This method can be divided into two steps, namely deposition of Al coating on Ti6Al4V substrate by using plasma spraying and laser nitriding in nitrogen atmosphere. The effects of nitrogen flow rate and laser scanning speed used in laser nitriding on the mechanical properties of the TiN/Ti3Al composite coatings, such as microhardness, elastic modulus and fracture toughness, were investigated. Results showed that the mechanical properties of coatings were strongly dependent on laser parameters. With increasing nitrogen flow rate or decreasing scanning speed, the amount and density of TiN phase in the coating increased, leading to increased microhardness and elastic modulus, and decreased fracture toughness.