Effect of δ-ferrite on Susceptibility to Hydrogen Embrittlement of 304 Austenitic Stainless Steel in High-Pressure Hydrogen
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摘要: 将304奥氏体不锈钢在1 050℃进行固溶处理以改变δ铁素体组织的含量，并分别在高压氢气和氩气环境中进行了慢应变速率拉伸和疲劳裂纹扩展试验，研究了δ铁素体对试验钢氢脆敏感性的影响。结果表明：试验钢原始组织中存在较多的δ铁素体，经1 050℃固溶处理后，δ铁素体几乎完全消失；在高压氢气环境中，δ铁素体的存在降低了试验钢的塑性，增强了其氢脆敏感性；δ铁素体的存在为氢提供了快速扩散的通道，从而提高了试验钢的疲劳裂纹扩展速率。Abstract: 304 austenitic stainless steel was treated by solid solution at 1 050℃ to change the content of δ-ferrite structure, and then the slow strain rate tensile test and fatigue crack growth test were carried out in high-pressure hydrogen and argon, respectively. The effect of δ-ferrite on the susceptibility to hydrogen embrittlement of the tested steel was investigated. The results show that a ralatively large amount of δ-ferrite existed in original structure of the tested steel. After solid solution at 1 050℃, the δ-ferrite almost disappeared. In high-pressure hydrogen, the existence of δ-ferrite reduced the plasticity of the tested steel and enhanced the susceptibility to hydrogen embrittlement. The presence of δ-ferrite provided a fast diffusion channel for hydrogen and improved the fatigue crack growth rate of the tested steel.
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Keywords:
- austenitic stainless steel /
- δ-ferrite /
- hydrogen embrittlement /
- fatigue crack
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