Effect of nanosized NbC precipitates on hydrogen-induced cracking of high-strength low-alloy steel

被引：22
|
作者：
Fan, En-dian [1 ]
Zhang, Shi-qi [1 ,2 ]
Xie, Dong-han [1 ]
Zhao, Qi-yue [1 ]
Li, Xiao-gang [1 ,3 ]
Huang, Yun-hua [1 ]
机构：
[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China
[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2021年 / 28卷 / 02期
基金：
中国国家自然科学基金;
关键词：
nanosized NbC precipitates; high-strength low-alloy steel; hydrogen-induced cracking; slow-strain-rate tensile; hydrogen charging;
D O I：
10.1007/s12613-020-2167-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigated the effect of nanosized NbC precipitates on hydrogen-induced cracking (HIC) of high-strength low-alloy steel by conducting slow-strain-rate tensile tests (SSRT) and performing continuous hydrogen charging and fracture analysis. The results reveal that the HIC resistance of Nb-bearing steel is obviously superior to that of Nb-free steel, with the fractured Nb-bearing steel in the SSRT exhibiting a smaller ratio of elongation reduction (I-delta). However, as the hydrogen traps induced by NbC precipitates approach hydrogen saturation, the effect of the precipitates on the HIC resistance attenuate. We speculate that the highly dispersed nanosized NbC precipitates act as irreversible hydrogen traps that hinder the accumulation of hydrogen at potential crack nucleation sites. In addition, much like Nb-free steel, the Nb-bearing steel exhibits both H-solution strengthening and the resistance to HIC.
引用
收藏
页码：249 / 256
页数：8
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