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采用金相显微镜,氢渗透试验和慢应变速率拉伸试验结合扫描电镜研究了微观组织对2205双相不锈钢氢渗透行为及氢脆敏感性的影响。微观组织分析表明,随着固溶处理温度升高,铁素体含量升高,奥氏体含量降低。氢渗透试验结果显示,随着铁素体含量升高,氢在2205双相不锈钢中的扩散系数增大。结合慢应变速率拉伸试验和断口形貌观察发现,950℃固溶处理的2205双相不锈钢的氢脆敏感性较高,呈现脆性断裂;而1050℃固溶处理试样中的铁素体和奥氏体含量较均衡,氢脆敏感性较低,呈韧性断裂特征。
The effects of microstructure on hydrogen permeation and hydrogen embrittlement susceptibility of 2205 duplex stainless steel were investigated by metallographic microscope, hydrogen permeation test and slow strain rate tensile test combined with scanning electron microscopy. Microstructure analysis shows that with the increase of solution treatment temperature, the content of ferrite increases and austenite content decreases. Hydrogen penetration test results show that with the increase of ferrite, the diffusion coefficient of hydrogen in 2205 duplex stainless steel increases. Combined with the slow strain rate tensile test and the fracture morphology observation, 2205 duplex stainless steel solution treated at 950 ℃ has high hydrogen embrittlement susceptibility and brittle fracture. However, the ferritic and Austenite content is more balanced, hydrogen embrittlement sensitivity is low, showing the characteristics of ductile fracture.