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对Ti-6Al-4V钛合金电子束焊接试样进行高温气体渗氢,研究了置氢对显微组织形态的影响,并对微量氢对Ti-6Al-4V疲劳寿命的影响进行考察。显微组织研究结果表明:置氢浓度低于0.120 wt%时,氢以固溶态存在于合金中,并未形成氢化物;位错在次生的α、β相区聚集,α/β相界往往是裂纹萌生的根源。疲劳实验结果表明:随置氢浓度的增加,疲劳寿命大幅下降;这是由于微量氢的存在降低了Ti-6Al-4V的韧性,并加速疲劳裂纹的扩展,从而降低了疲劳寿命。
The effects of hydrogen on the microstructure of Ti-6Al-4V titanium alloy electron beam welded samples were studied. The effects of hydrogen on the fatigue life of Ti-6Al-4V were investigated. The results of the microstructure study show that when the hydrogen concentration is lower than 0.120 wt%, the hydrogen exists in the solid solution in the alloy and no hydride is formed. The dislocations are aggregated in the secondary α and β phase regions, and the α / β phase Industry is often the root cause of crack initiation. The fatigue test results show that the fatigue life decreases greatly with the increase of hydrogen concentration. This is because the presence of trace hydrogen reduces the toughness of Ti-6Al-4V and accelerates the propagation of fatigue cracks, thus reducing the fatigue life.