Hydrogen redistribution under stress-induced diffusion and corresponding fracture behaviour of a structural steel
Hydrogen redistribution under stress-induced diffusion and corresponding fracture behaviour of a structural steel
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结构钢应力诱导扩散下的氢再分布及相应的断裂行为
DOI：
10.1080/02670836.2017.1325562
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发表时间：
2017-01-01
影响因子：
1.8
通讯作者：
Volinsky, Alex A.
中科院分区：
文献类型：
--
作者：
Kan, B.;Yang, Z. X.;Volinsky, Alex A.
研究了960 MPa级马氏体钢在应力诱导氢扩散下的氢再分布及相应的断裂行为。进行了预充氢后的慢应变速率拉伸（SSRT）试验，并对断口进行了观察和分析。应变速率范围为10 - 6 ~ 10 - 4s-1。在具有0.62ppm的一定氢含量的预充样品中，在SSRT测试之前氢分布是均匀的。拉伸试验后，脆性断裂特征出现在断裂表面的中心，而韧性特征出现在周围区域。在10 - 4 ~ 5 × 10 - 6s-1应变速率范围内，脆性区尺寸随应变速率的降低而增大，当应变速率低于5 × 10 - 6s-1时，脆性区尺寸趋于稳定。根据现有的材料中氢含量数据，建立了应变速率与脆性区尺寸之间的关系，并进行了讨论。本文是金属合金中氢的专题研究的一部分
Hydrogen redistribution under stress-induced hydrogen diffusion and corresponding fracture behaviour of a 960 MPa grade martensitic steel were studied. Slow strain rate tensile (SSRT) tests after hydrogen pre-charging were performed and the fracture surface was observed and analysed. The strain rate ranged from 10−6to 10−4s−1. In the pre-charged sample with a certain hydrogen content of 0.62 ppm, hydrogen distribution was homogeneous before the SSRT test. After tensile testing, brittle fracture features appeared in the centre of the fracture surface, while ductile features appeared in the surrounding area. Brittle region size increased with the strain rate slowing down in the range from 10−4to 5 × 10−6s−1, while it stabilised at the strain rate slower than 5 × 10−6s−1. Relationship between the strain rate and the brittle region size was established and discussed based on the present data of hydrogen content in the material.This paper is part of a thematic issue on Hydrogen in Metallic Alloys