The Influence of Hydrogen on the Low Cycle Fatigue Behavior of Medium Strength 3.5NiCrMoV Steel Studied Using Notched Specimens

被引：9
|
作者：
Liu, Qian [1 ]
Atrens, Andrej [1 ]
机构：
[1] Univ Queensland, Mat Engn, St Lucia, Qld 4072, Australia
来源：
ADVANCED ENGINEERING MATERIALS | 2018年 / 20卷 / 02期
基金：
澳大利亚研究理事会;
关键词：
Hydrogen; Low cycle fatigue; Medium strength steel; Scanning electron microscopy; CRACK GROWTH; PLASTICITY; MECHANISM; FRACTURE; FAILURE;
D O I：
10.1002/adem.201700680
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of hydrogen on low cycle fatigue (LCF) of 3.5NiCrMoV steel electrochemically hydrogen charged in the acidified pH 2 0.1M Na2SO4 solution is studied. In the presence of hydrogen, the fatigue life decreases significantly by approximate to 70 to approximate to 80% by: (i) the crack initiation period is decreased; and (ii) the crack growth rate is accelerated. SEM observation indicates that in the presence of hydrogen, the fracture surface shows flat transgranular fracture with vague striations and some intergranular fracture at lower stresses. The fatigue crack growth rate increases with increasing cyclic stress amplitude and with hydrogen fugacity. Once the fatigue crack reaches a critical length, the specimen becomes mechanical unstable and fracture due to ductile overload occurs. The hydrogen contribution to the final fracture process is not significant.
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页数：12
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