(1. 大连理工大学 材料科学与工程学院，大连 116085；2. 北京航空制造工程研究所，北京 100024)
摘 要: 应用压缩实验研究置氢TC4钛合金在不同热处理条件下的显微组织及室温变形性能。利用金相显微镜、X射线衍射仪和扫描电镜等手段分析置氢的微观组织、相组成和断口特征。结果表明：氢作为β稳定元素，降低了合金的相变点，促进斜方马氏体
关键字: TC4钛合金；氢处理；力学性能
（1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:The microstructures and room temperature mechanical properties of hydrogenated TC4 Ti alloy under different heat treatments were studied. The microstructures, composition of phase and the character of the fracture surface were investigated by optical microscope, X-ray diffraction and scanning electron microscope (SEM). The results show that hydrogen as stable element decreases the phase transformation temperature(Tβ) and promote the generation of orthorhombic martensite . When the alloys are quenched above Tβ and in two phase temperature region, the yield strength(σ0.2) decreases dramatically and both the compressive strength and the limited deformation rate(εlim.) increases due to the combination effect of martensite and hydrogen. The changes for specimens quenched over Tβ exhibit more obviously than in two phase temperature region. The deformation limit of specimen containing 0.44%H increases by 20% while σ0.2 decreases by 30%.
Key words: TC4 titanium alloys; hydrogen treatment; mechanical properties
