Crack and blister initiation and growth in purified iron due to hydrogen loading

被引：94
|
作者：
Tiegel, Marie C. [1 ]
Martin, May L. [1 ]
Lehmberg, Annegret K. [1 ]
Deutges, Martin [1 ]
Borchers, Christine [1 ]
Kirchheim, Reiner [1 ,2 ]
机构：
[1] Univ Gottingen, Inst Mat Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka, Japan
来源：
ACTA MATERIALIA | 2016年 / 115卷
关键词：
Hydrogen induced cracking; Iron; Crack initiation; Inclusion; Blister; VACANCY FORMATION ENERGIES; REDUCING GRAIN-BOUNDARY; X80 PIPELINE STEEL; TRAPPING EFFICIENCY; SOLUTE SEGREGATION; DUCTILE FRACTURE; DISLOCATION LINE; ALLOYS; MICROSTRUCTURE; ADSORPTION;
D O I：
10.1016/j.actamat.2016.05.034
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Purified iron was loaded electrochemically with hydrogen in the presence of a hydrogen promoter, leading to the formation of cracks inside of the bulk and blisters on the surface. The mechanism for the crack initiation was investigated using SEM cross-section images and by investigating the fracture surface of a ruptured sample, where preexisting cracks were exposed for observation. Cracks were found to originate at inclusions. It was observed that blisters grow with time, leading to the conclusion that the underlying growth process is discontinuous. The surface morphology of the blisters consists of steps and in the underlying microstructure investigated by TEM shear bands were found. Hydrogen gas pressures in the range of half of the yield strength of iron were determined directly after hydrogen loading using density measurements. Therefore, the hydrogen gas pressure in the cracks was concluded to be the driving force for crack advance. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：24 / 34
页数：11
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