Effect of Chronium on Hydrogen Environment Embrittlement of Fe-Cr Alloys
Effect of Chronium on Hydrogen Environment Embrittlement of Fe-Cr Alloys
复制标题
铬对铁铬合金氢环境脆化的影响
DOI：
10.2320/jinstmet1952.67.4_161
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发表时间：
2003
影响因子：
--
通讯作者：
K. Yokogawa
中科院分区：
文献类型：
--
作者：
S. Fukuyama;Lin Zhang;M. Wen;K. Yokogawa
采用专门设计的设备，在室温1.1~39.3 MPa氢气和0.6 MPa氩气中研究了铬含量高达30的FeCr合金的拉伸性能。得到的结果如下。 1、Cr含量达30的退火FeCr合金随着氢气压力的增加，退火合金的伸长率和断面收缩率降低，而氢气对0.2屈服强度和抗拉强度没有影响。氢环境脆（HEE）在铬含量为4～8时最小，当铬含量超过12时，HEE随着铬含量的增加而增加。认为当应力应变图中最大载荷点附近发生塑性变形时，氢在表面形成的裂纹迅速扩展。 2、16~30Cr含量的FeCr合金在748 K时效时效后16~20铬含量合金的氢敏感性大于退火态合金，HEE行为与退火态合金相同。在铬含量为25～30的时效合金中，随着氢压和铬含量的增加，抗拉强度、伸长率和断面收缩率均大幅下降，而氢对0.2屈服强度没有影响。认为748 K时效增强了解理断裂敏感性，且塑性变形较小的氢形成的小裂纹很容易诱发解理断裂，因此748 K时效提高了HEE敏感性。
Tensile properties of FeCr alloys of chromium content up to 30 were investigated from 1.1 to 39.3 MPa of hydrogen and in 0.6 MPa of argon at room temperature by using a specially designed equipment. The results obtained are as follows. 1. Annealed FeCr alloys of Cr content up to 30 Elongation and reduction of area of the annealed alloys decreased with increase in hydrogen pressure, while hydrogen showed no effect on 0.2 proof stress and tensile strength. Hydrogen environment embrittlement (HEE) was minimized at 4~ 8 of chromium content, and HEE increased with increase in chromium content above 12. It is considered that the crack formed by hydrogen on the surface propagated rapidly, when plastic deformation occurred near the maximum load point in stressstrain diagram. 2. FeCr alloys of 16~30Cr content aged at 748 K Hydrogen susceptibility of aged alloys of 16 to 20 chromium content from was larger than that of annealed alloys, and HEE behavior was the same as that of annealed ones. In the aged alloys of 25 to 30 chromium content, the tensile strength, elongation and the reduction of area greatly decreased with increase both in hydrogen pressure and chromium content, while hydrogen showed no effect on 0.2 proof stress. It is considered that the aging at 748 K enhanced the cleavage fracture sensitivity, and a small crack formed by hydrogen with small plastic deformation induced the cleavage fracture easily, thus the aging at 748 K increased the HEE sensitivity.