【摘要】 用紧凑拉伸实验研究了铁素体-奥氏体双相不锈钢的氢致延迟开裂过程,发现氢致开裂应力强度因子门槛值K_H随γ量增加而增加,随充氢电流密度增加而下降。氢致裂纹在α相内{100}面形核,扩展连通,最后将γ相和晶界撕裂,γ相阻碍氢致延迟裂纹的扩展,在断裂方面起到“纤维韧化”的作用。更多还原

【Abstract】 Hydrogen induced cracking in a ferrite-austenite, duplex stainlesssteel has been investigated using compact tension tests. The stress intensity thre-shold K_H of the steel increases with increasing austenite content and decreases withincreasing current density during hydrogen charging. The hydrogen induced crack-ing initiates and propagates on {100} planes of the ferrite. The austenite plays a"fibre-tougthed" role during obstructing crack propagation.更多还原