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通过慢应变速率拉伸试验研究了奥氏体化温度对25CrNi2MoVNb钢的氢脆敏感性的影响。奥氏体化温度从880℃升高到1200℃,25CrNi2MoVNb钢的原奥氏体晶粒尺寸从6μm长大到204μm。随奥氏体化温度升高,奥氏体晶粒长大会导致氢脆敏感性增加,但同时屈服强度下降会导致氢脆敏感性降低。在本试验条件下,奥氏体化温度为1100℃时,25CrNi2MoVNb钢的原奥氏体晶粒尺寸为57μm,氢脆敏感性最低。
The effect of austenitizing temperature on the hydrogen embrittlement susceptibility of 25CrNi2MoVNb steel was studied by slow strain rate tensile test. The austenitizing temperature increased from 880 ℃ to 1200 ℃. The original austenite grain size of 25CrNi2MoVNb steel increased from 6μm to 204μm. As the austenitizing temperature increases, austenite grain growth will lead to an increase in hydrogen embrittlement susceptibility, but at the same time the decrease in yield strength will result in a decrease in hydrogen embrittlement susceptibility. Under the experimental conditions, the original austenite grain size of 25CrNi2MoVNb steel is 57μm when austenitizing temperature is 1100 ℃, and the hydrogen embrittlement sensitivity is the lowest.