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首页> 外文会议>2002 ASME Pressure Vessels and Piping Conference, Aug 5-9, 2002, Vancouver, British Columbia, Canada >HYDROGEN EMBRITTLEMENT TESTING OF 2.25Cr-1Mo STEEL USING LARGE THICK SPECIMEN
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HYDROGEN EMBRITTLEMENT TESTING OF 2.25Cr-1Mo STEEL USING LARGE THICK SPECIMEN

机译：大厚度试样对2.25Cr-1Mo钢的氢脆化测试

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A large 3.5 inch thick compact tension specimen(CT) was hydrogen pre-charged in an extra high capacity autoclave in order to introduce hydrogen into steel, then hydrogen cracking tests were conducted for an extended period of time in ambient air. The anticipated out gassing from the specimen was significantly less in the 3.5T-CT specimen than in the conventional l.0T-CT specimen. The residual hydrogen after 2 weeks of exposure to ambient air was as much as 80%(≥2 ppm) of the original hydrogen introduced. The threshold stress intensity factor for the onset of cracking(=k_(IH)) for the high toughness, recently manufactured 2.25Cr-1Mo steel was severely degraded to K_(IH) =42 MPam~(1/2) (46 ksii~(1/2)n)under ultra slow strain rate (dK/dt=0.005 MPam~(1/2)/sec.(0.006 ksii~(1/2)n/sec)) and subcritical cracking continued over 100 hours. The crack growth rate was kept almost constant regardless of slow change of increase or decrease in K. On the other hand, the temper embrittled 60's 2.25Cr-1Mo steel showed brittle, unstable fracture at very low stress intensity factor (K_(IC-H) =33 MPam~(1/2)(36 ksii~(1/2)n)) with no subcritical crack occurring before the fracture event. The fracture point K_(IC-H) turned out to be as low as 10% of the fracture toughness K_(IC). Finally, comparisons were made between 2.25Cr-lMo and 2.25Cr-lMo-l/4V steels by tests of small specimens, since the 2.25Cr-1Mo-l/4V steel substantially retains hydrogen for its lowest diffusion coefficient. The degree of hydrogen embrittlement is higher at room temperature for both steels.
机译：为了将氢气引入钢中，将一个3.5英寸厚的大型致密拉伸试样（CT）预装氢气，以便将氢气引入钢中，然后在环境空气中进行长时间的氢气裂化测试。在3.5T-CT样品中，预期的样品放气量比常规的1.0T-CT样品少。暴露于环境空气2周后的残留氢高达引入的原始氢的80％（≥2ppm）。新生产的2.25Cr-1Mo钢的高韧性开裂的阈值应力强度因子（= k_（IH））严重退化为K_（IH）= 42 MPam〜（1/2）（46 ksii〜 （1/2）n）在超慢应变速率下（dK / dt = 0.005 MPam〜（1/2）/ sec。（0.006 ksii〜（1/2）n / sec））和亚临界裂纹持续了100多个小时。无论K的增减缓慢变化如何，裂纹扩展速率都几乎保持恒定。另一方面，在非常低的应力强度因子下，回火脆化的60年代2.25Cr-1Mo钢表现出脆性，不稳定的断裂（K_（IC-H ）= 33 MPam〜（1/2）（36 ksii〜（1/2）n）），在断裂之前没有发生亚临界裂纹。结果表明，断裂点K_（IC-H）低至断裂韧性K_（IC）的10％。最后，通过对小试样进行测试，对2.25Cr-1Mo和2.25Cr-1Mo-1 / 4V钢进行了比较，因为2.25Cr-1Mo-1 / 4V钢由于其最低的扩散系数而基本上保留了氢。两种钢在室温下的氢脆程度都较高。

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