随着氢浓度增加, Ti-60合金中的初生α相的体积分数、(α+β)→β相变点及高温屈服强度均连续降低.高温拉伸时合金的最低屈服点出现在相应氢浓度下的(α+β)→β相变点处, 进一步增加氢含量反而使合金的屈服强度升高, 其原因是氢强化了相. Ti-60合金中氢浓度w(H)与(α+β)→β相变点满足方程: t(α+β)→β(℃)=815+210exp(-3w(H)). 900℃拉伸时, 0.3%的氢使合金的屈服强度降幅达70%
The effect of hydrogen charging on the microstructure (α+β)/βtransformation and the mechanical properties of Ti-60 alloy at high temperature have been investigated. The results show that the volume fraction of primaryαand the (α+β)/βtransformation temperature is continuously decreased with increasing hydrogen contents. The result also indicate that the yield strength at high temperature is also continuously decreased with hydrogen concentration, and the minimum yield strength occurs at a concentration which corresponds to the (α+β)/βtransition and that further increase in yield strength is due to the hardening effect of hydrogen addition in the βphase.
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