通过系列热处理和热充氢实验，采用光学显微镜、SEM和拉伸试验等研究了不同温度时效处理对沉淀硬化马氏体不锈钢FV520B的氢脆敏感性的影响.结果表明：充氢后，FV520B钢表现出良好的抗氢脆性能；450℃低温时效后钢的氢脆敏感性较高，而630℃中温时效后，钢中由于析出较多的逆变奥氏体，阻碍氢扩散和裂纹扩展；充氢后表现出良好的抗氢脆性能.塑性损减率随钢中逆变奥氏体的增加而降低.
The hydrogen embrittlement of a precipitation-hardened martensitic stainless steel,FV520B,after different aging treatments was studied by using optic microscopy,Xray diffraction,SEM and mechanical testing.Hydrogen was introduced into the steel by thermal charging.The results showed that the steel exhibited an obvious hydrogen resistance.The hydrogen induced ductility loss of the steel aged at 630℃ was lower than that at 450℃,which is due to the existence of reverse austenite.The reverse austenite prevents the diffusion and aggregation of hydrogen atoms and restrains the propagation of cracks,therefore,improves the hydrogen resistance of the steel.The hydrogen induced ductility loss decreased with increase of the amount of reverse austenite in the steel.
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