摘要
利用恒载荷试样和 ＷＯＬ试样研究了 Ｎｉ３Ａｌ＋ＮｉＡｌ双相合金中氢致裂纹形核的规律以及氢致滞后断裂归一化门槛应力σｃ／σｆ与试样中可扩散氢含量 ｗｈｏ的关系.结果表明，氢致裂纹择优在 ＮｉＡｌ相中或 Ｎｉ３Ａｌ／ＮｉＡｌ相界面处形核扩展；Ｎｉ３Ａｌ能阻碍氢致裂纹扩展.恒载荷实验表明，氢致滞后断裂门槛应力随可扩散氢含量的对数线性下降，即σｃ／σｆ＝０.５８－０.０４２ｌｎ Ｈｏ。
The rule of hydrogen-induced crack nucleating and the threshold stress for hydrogen-induced delayed failure as a function of diffusible hydrogen concentration were studied. The results show that hydrogen-induced crack nucleated preferencially in NiAl phase and/or at Ni(3)AI/NiAl interface. Ni3Al could arrested hydrogen-induced crack propagating. The normalized threshold stress for hydrogen-induced delayed failure decreases linearly with the logarithm of the diffusible hydrogen concentration W-H0, i.e. sigma(c)/sigma(f)=0.58-0.042 ln w(H0).
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第10期1049-1052,共4页
Acta Metallurgica Sinica
基金
国家重点基础研究专项基金G1999065000
国家自然科学基金59895150
