Effect of grain size on hydrogen embrittlement in stable austenitic high-Mn TWIP and high-N stainless steels

被引：22
|
作者：
Noh, Han-Seop [1 ,3 ]
Kang, Jee-Hyun [2 ]
Kim, Sung-Joon [1 ]
机构：
[1] POSTECH, Grad Inst Ferrous Technol, Pohang 37673, South Korea
[2] Yeungnam Univ, Sch Mat Sci & Engn, Inst Mat Technol, Gyongsan 38541, South Korea
[3] POSCO, Tech Res Labs, Pohang 37859, South Korea
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2019年 / 44卷 / 45期
基金：
新加坡国家研究基金会;
关键词：
Austenitic steel; X-ray diffraction; TEM; Hydrogen embrittlement; Grain size; Dislocation density; X-RAY-DIFFRACTION; STACKING-FAULT ENERGY; INDUCED PLASTICITY; ENVIRONMENT EMBRITTLEMENT; DISLOCATION DENSITY; INTERNAL HYDROGEN; REDUCED AMOUNT; DEFORMATION; REFINEMENT; TENSILE;
D O I：
10.1016/j.ijhydene.2019.07.227
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Two stable austenitic steels, 20Cr-11Ni-5Mn-0.3N (wt%) stainless steel (STS) and 18Mn-1.5Al-0.6C (wt%) twinning-induced plasticity steel (TWIP), were investigated to understand the effect of grain size on hydrogen embrittlement (HE). Grain refinement promoted HE in the STS but suppressed HE in the TWIP. These opposite effects occurred because the steel composition affected deformation mechanism. Cr-N pair enhanced short-range ordering (SRO) in STS, which promoted planar slip and delayed mechanical twinning. In contrast, TWIP exhibited mechanical twinning which was more active in coarser grains. Final dislocation density after tensile deformation was increased by grain refinement in STS, but was decreased in TWIP. The damaging effects of hydrogen on strain energy at interfaces and on interfacial bonding strength were controlled by dislocation density; therefore, increase in dislocation density led to increase in susceptibility to HE. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：25076 / 25090
页数：15
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