Effect of grain size on the hydrogen embrittlement sensitivity of a precipitation strengthened Fe-Ni based alloy
Effect of grain size on the hydrogen embrittlement sensitivity of a precipitation strengthened Fe-Ni based alloy
复制标题
晶粒尺寸对沉淀强化Fe-Ni基合金氢脆敏感性的影响
DOI：
10.1016/j.msea.2013.11.062
复制
发表时间：
2014-01-31
期刊：
影响因子：
6.4
通讯作者：
Rong, Lijian
中科院分区：
文献类型：
--
作者：
Chen, Shenghu;Zhao, Mingjiu;Rong, Lijian
通过热充氢试验和拉伸试验研究了不同晶粒度的沉淀强化Fe-Ni基合金的氢脆敏感性。结果表明，尽管小晶粒试样的氢浓度高于大晶粒试样，但随着晶粒尺寸的减小，试样的氢敏感性降低。断口形貌特征表明，随着晶粒尺寸的减小，沿晶断裂不太明显，这与氢通过移动位错向晶界的运输有关。在变形过程中，预计在滑移带中的位错的数量是成正比的晶粒尺寸，导致较低的氢浓度被积累在晶界处的小晶粒试样。(C)2013爱思唯尔有限公司版权所有。
The hydrogen embrittlement (HE) sensitivity of a precipitation strengthened Fe-Ni based alloy with various grain sizes was investigated by hot hydrogen charging experiment and tensile test. The results showed that HE sensitivity was reduced with decreasing grain size, even though the hydrogen concentration in the small-grained specimen was higher than the large-grained specimen. Fractographic features showed that intergranular fracture was less pronounced with decreasing grain size, which was related to the transport of hydrogen to the grain boundary by moving dislocations. During deformation, the number of dislocations expected in the slip bands was proportional to the grain size, leading to that a lower hydrogen concentration being accumulated at the grain boundary in the small-grained specimen. (C) 2013 Elsevier B.V. All rights reserved.