摘要
The effect of hydrogen on hot deformability of Ti-6Al-4V alloy was investigated by isothermal hot compression test with temperature of 800℃and velocity of 0.1 mm/s. By optical microscopy (OM) and transmission electron microscopy (TEM), the influence of hydrogen on the microstructural features was systematically examined including the morphology ofαgrain, volume fraction ofαphase and dynamic recrystallization (DRX). The flow stress shows an initial decrease but a later increase with the increase of hydrogen content. The minimum of peak compression flow stress is obtained when 0.2% hydrogen is added into the alloy. The hydrogen-induced softening of Ti-6Al-4V alloy may be that hydrogen induces the increase of proportion of softβphase, the increase of DRX and the increase of extent of twins.
The effect of hydrogen on hot deformability of Ti-6Al-4V alloy was investigated by isothermal hot compression test with temperature of 800 ℃ and velocity of 0.1 mm/s. By optical microscopy （OM） and transmission electron microscopy （TEM）, the influence of hydrogen on the microstructural features was systematically examined including the morphology of a grain, volume fraction of a phase and dynamic recrystallization （DRX）. The flow stress shows an initial decrease but a later increase with the increase of hydrogen content. The minimum of peak compression flow stress is obtained when 0.2% hydrogen is added into the alloy. The hydrogen-induced softening of Ti-6Al-4V alloy may be that hydrogen induces the increase of proportion of soft β phase, the increase of DRX and the increase of extent of twins.
出处
《中国有色金属学会会刊：英文版》
CSCD
2006年第A03期2072-2076,共5页
Transactions of Nonferrous Metals Society of China
关键词
钛合金
氢
可加工性
变形性
再结晶作用
Ti-6Al-4V alloy：, hydrogen
flow stress
hot workability
microstructural evolution
