Delayed fracture behavior of ultra-high-strength mooring chain steel evaluated by potentiostatic hydrogen-charging combined with SSRT

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-05-28 DOI:10.1038/s41529-024-00477-3

Jiajiao Wei, Ke Hou, Feng Yang, Zhipeng Chang, Ju Li, Yunliang Shao, Mengjia Li, Xiaomei Yu, Jinyou Zheng, Yutao Zhou, Yongpeng Yang, Dehai Ping, Yong Liu, Min Li, Songjie Li

引用次数: 0

Abstract

The influence of hydrogen charging potentials on the hydrogen embrittlement susceptibility of R6 ultra-high strength mooring chain steel was investigated via constant potential hydrogen charging slow strain rate tensile tests combined with thermal desorption analysis. The results reveal that hydrogen charging leads to a 38.94% decrease in elongation, while the impact on tensile strength is relatively minor. Furthermore, the specimens experienced intergranular cracking at the critical potential of −1150 mV, with the size of the brittle region increasing as the negative charging potential becomes more negative. And, hydrogen atoms can cause local embrittlement of materials and increase KAM value.

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通过恒电位充氢结合 SSRT 评估超高强度系泊链钢的延迟断裂行为

通过恒电位充氢慢应变速率拉伸试验结合热脱附分析，研究了充氢电位对 R6 超高强度系泊链钢氢脆敏感性的影响。结果表明，充氢导致伸长率下降 38.94%，而对拉伸强度的影响相对较小。此外，试样在临界电位 -1150 mV 时出现晶间开裂，脆性区域的大小随着负充电电位的增加而增大。而且，氢原子会导致材料局部脆化并增加 KAM 值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies