通过系列热处理和热充氧实验,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钢表现出良好的抗氧脆件能;450℃低温时效后钢的氢脆敏感件较高,而630℃中温时效后,钢中由于析出较多的逆变奥氏体,阻碍氧扩散和裂纹扩展;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.
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