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首页> 外文期刊>ISIJ international >Effect of Hydrogen Partial Pressure on Fatigue Crack Growth Rate of Type304 Stainless Steel in H2/Ar Mixed Gas with Wide Range of Pressures
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Effect of Hydrogen Partial Pressure on Fatigue Crack Growth Rate of Type304 Stainless Steel in H2/Ar Mixed Gas with Wide Range of Pressures

机译：氢分压对宽压力范围H 2 / Ar混合气体中304型不锈钢疲劳裂纹扩展速率的影响

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摘要

Fatigue crack growth testing was carried out on Type304 stainless steel (Type304SS) at room temperature (RT) in mixed gasses controlled to various pressure levels of up to 70 MPa in order to measure changes in embrittlement sensitivity due to hydrogen partial pressure. At P _(H2) less than 3 MPa, as hydrogen partial pressure decreases, the crack growth rate (da/dN) of Type304SS decreased, and at P _(H2)=5×10~(?5) MPa (50 Pa), it was 2.8 times higher than that in the air. The hydrogen partial pressure whose da/dN equals the rate in the air, which is the lower limit critical hydrogen partial pressure, was not observed. On the other hand, at P _(H2)=3 MPa or higher, the da/dN reached approximately 20 times higher than in the air. There was an upper limit of the da/dN which no longer increases after hydrogen partial pressure reaches a certain level. From a conservative judgment, it is able to plan the fatigue life considering the da/dN at P _(H2)=3 MPa as the upper limit; approximately 20 times higher than in the air.
机译：疲劳裂纹扩展测试是在室温（RT）的混合气体中对304型不锈钢（304SS型）进行的，混合气体控制在最高70 MPa的各种压力水平下，以测量由于氢分压引起的脆化敏感性变化。在P _（H2）小于3 MPa时，随着氢分压的降低，304SS型的裂纹扩展速率（da / dN）降低，在P _（H2）= 5×10〜（？ 5）MPa（50 Pa），是空气中的2.8倍。未观察到da / dN等于空气中的比率的氢分压，其为下限临界氢分压。另一方面，在P _（H 2）＝ 3MPa或更高时，da / dN达到空气中的约20倍。 da / dN的上限在氢分压达到一定水平后不再增加。根据保守的判断，可以将p_（H2）= 3MPa的da / dN作为上限来计划疲劳寿命。大约比空气高20倍。

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