氢处理对TC4钛合金组织及室温变形性能的影响

来源期刊：中国有色金属学报2008年第5期

论文作者：孙中刚 侯红亮 李红 王耀奇 李晓华 李志强 周文龙

文章页码：789 - 789

关键词：TC4钛合金；氢处理；力学性能

Key words：TC4 titanium alloys; hydrogen treatment; mechanical properties

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 的生成；合金在马氏体和氢的共同作用下，经过相变点以上及两相区淬火后，屈服强度σ_0.2大幅下降，抗压强度升高，极限变形率提高；相变点以上淬火降低幅度高于两相区，在氢含量为0.44%时，σ_0.2降低了30%，极限变形提高了20%。

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%.