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应用压缩实验研究置氢Ti-6Al-4V合金的室温力学行为,采用OM、SEM分析了氢对钛合金组织的影响和断口形貌特征,探讨了置氢钛合金组织和室温变形行为之间的相关性.结果表明:氢的固溶强化作用使置氢Ti-6Al-4V合金硬化效应增加,但适量的氢可以显著降低其压缩屈服强度和弹性模量,且断裂时发生的变形量增加,此时合金组织为α+β的双态组织,当合金中产生粗大的β晶粒时,断裂时发生的变形量显著降低;氢的加入促进了合金中斜方马氏体α″的生成;置氢Ti-6Al-4V合金的室温压缩断口为延性沿晶断裂或脆性沿晶断裂和解理型穿晶断裂两种断裂方式的混合断口.
The compressive experiment was used to study the room-temperature mechanical behavior of Ti-6Al-4V alloy. The effect of hydrogen on the microstructure and fracture morphology of the Ti-6Al-4V alloy was analyzed by OM and SEM. The results show that the solid solution strengthening effect of hydrogen increases the hardening effect of Ti-6Al-4V alloy, but the amount of hydrogen can significantly reduce the compressive yield strength and elastic modulus, At this time, the microstructure of the alloy is α + β dual-phase structure. When the coarse β grains are formed in the alloy, the amount of deformation occurred at the time of rupture is significantly reduced. The addition of hydrogen promotes the formation of rhombic martensite α " The room temperature compression fracture of hydrogen-setting Ti-6Al-4V alloy is a mixed fracture of two kinds of fracture modes of ductile or brittle intergranular fracture and cleavage-type transgranular fracture.