摘要
研究了 4种含量的氢对Ti 2Al 2 5Zr钛合金疲劳性能的影响。结果表明 ,自然含氢量的材料具有最好的疲劳性能。而当疲劳载荷大于材料的屈服强度时 ,氢含量对疲劳寿命基本没有影响 ;低于屈服强度后 ,疲劳寿命随着氢含量的升高而下降。认为固溶的原子氢导致驻留滑移带软化 ,裂纹萌生提前 ,造成在较大△σ时充氢试样的疲劳寿命降低 ;而材料中氢化物对驻留滑移带 (PSB)的阻碍作用导致氢化物与基体分离而成为裂纹源 ,是小△σ下疲劳寿命降低的主要原因。
Four kinds hydrogen contents have been employed to investigate the effects of hydrogen on fatigue property of Ti 2Al 2 5Zr titanium alloy.The results show that the hydrogen has little effect on fatigue life when fatigue load is higher than yield strength.Fatigue lives of samples decrease with the increase of hydrogen content when fatigue load is lower than yield strength.Explanation for the decrease of fatigue lives is that interstitial hydrogen atoms soften the Persistent Slip Bands(PSB),and hydrides bolck the PSBs,as a result,cracks initiate in advance.
出处
《金属热处理》
CAS
CSCD
北大核心
2002年第12期10-13,共4页
Heat Treatment of Metals
关键词
钛合金
疲劳断裂
氢
氢化物
titanium alloy
fatigue fracture
hydrogen
hydride
