ABSTRACT

In this study, the effect of Cr content on microstructure, mechanical properties and corrosion behaviour of Ti6Al4V alloy produced by selective laser melting (SLM) was investigated. The microstructure exhibited that α' martensite and β phase are obtained in SLM processed Ti6Al4V alloy and Ti6Al4V-Cr system alloys. The increment of Cr content results in the increment of β phase amount. The effect of Cr on the compressive strength and plastic deformation of Ti6Al4V alloy was evaluated by a compression test. The results indicate that the Ti6Al4V+5Cr alloy has a higher compressive strength and superior plastic deformation than that of the SLM processed Ti6Al4V alloy under optimum printing parameters. Meanwhile, the Ti6Al4V+8Cr alloy possesses the best plastic deformation and corrosion resistance. The Ti6Al4V-Cr system alloys, due to the combination of good mechanical properties and corrosion resistant, can be potentially applied in automotive, naval architecture and offshore facility manufacturing.

摘要

本研究研究了 Cr 含量对选区激光熔化 (SLM) 制备的 Ti6Al4V 合金组织、力学性能和腐蚀行为的影响。显微组织表明在SLM加工的Ti6Al4V合金和Ti6Al4V-Cr系合金中形成α'马氏体和β相。Cr含量的增加导致β相量的增加。通过压缩试验评价Cr对Ti6Al4V合金抗压强度和塑性变形的影响。结果表明，在最佳印刷参数下，​​Ti6Al4V+5Cr合金比SLM加工的Ti6Al4V合金具有更高的抗压强度和优越的塑性变形。同时，Ti6Al4V+8Cr合金具有最好的塑性变形和耐腐蚀性。Ti6Al4V-Cr系合金，