Mechanism of hydrogen embrittlement in a gamma-prime phase strengthened Fe-Ni based austenitic alloy

被引：33

作者：

Guo, Zifeng ^{[1
]}

Zhao, Mingjiu ^{[1
]}

Li, Caifu ^{[1
]}

Chen, Shenghu ^{[1
]}

Rong, Lijian ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Div Mat Special Environm, Shenyang 110016, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 555卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen embrittlement; gamma ' phase; Coherent interface; Planar slip; PLANAR SLIP BANDS; STAINLESS-STEELS; PLASTIC-DEFORMATION; LOW-TEMPERATURES; IRON-BASE; FRACTURE; MICROSTRUCTURE; NICKEL; DISLOCATIONS; PERFORMANCE;

D O I：

10.1016/j.msea.2012.06.036

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mechanism of hydrogen embrittlement (HE) in a gamma'-Ni-3(Al,Ti) phase strengthened Fe-Ni based austenitic alloy has been investigated in detail. Hot hydrogen charging experiment and tensile test reveal that the alloy with coherent gamma' phase exhibits a much higher decrease in reduction of area (RA) than that of the alloy in the solution-treated state. However, three-dimensional atom probe (3DAP) experiment shows that segregation of hydrogen atoms is not found at the coherent interface between the gamma' phase and the matrix, which indicates that the interface is not a strong hydrogen trap. Furthermore, high-resolution transmission electron microscopy (TEM) observation indicates that the interface coherency is maintained during the deformation, even tensile to fracture. It is found that macroscale slip band rupture and intergranular fracture are promoted by serious dislocation planar slip, which become the predominant features in the tensile-to-fracture sample after hydrogen charging. This phenomenon has been interpreted as a result of combined effects of the gamma' phase and hydrogen in the precipitation-strengthened Fe-Ni based austenitic alloy. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：77 / 84

页数：8