Hydrogen-induced cracking mechanism of precipitation strengthened austenitic stainless steel weldment

被引：22

作者：

Yan, Yingjie ^{[1
]}

Yan, Yu ^{[1
]}

He, Yang ^{[1
]}

Li, Jinxu ^{[1
]}

Su, Yanjing ^{[1
]}

Qiao, Lijie ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Key Lab Environm Fracture MOE, Beijing 100083, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2015年 / 40卷 / 05期

基金：

美国国家科学基金会;

关键词：

Precipitation strengthened austenitic stainless steel; Electron beam weld; Microstructure; Hydrogen-induced cracking; ENVIRONMENT EMBRITTLEMENT; IRON-BASE; TENSILE PROPERTIES; MICROSTRUCTURE; FRACTURE; DEFORMATION; DIFFUSION; WELDS;

D O I：

10.1016/j.ijhydene.2014.12.020

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：

Precipitation strengthened austenitic stainless steels are widely used in hydrogen related applications. However, their applications may face hydrogen damage resulting in hydrogen-induced delayed failure. Results show that the weld is more sensitive to fracture and hydrogen-induced failure than the matrix. High density curved dislocations, abundant of large size precipitates and considerable gamma ' precipitates coarsening are found in the weld. Large size precipitates are found to be major hydrogen traps and preferential microcrack nucleation sites. The gamma ' precipitates coarsening make the weld more ductile than the matrix. With the decrease of the applied stress, hydrogen-induced cracking mechanism in the weld changes from brittle transgranular fracture to brittle intergranular fracture. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：2404 / 2414

页数：11

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