A study on the susceptibility of high strength tempered martensite steels to hydrogen embrittlement (HE) based on incremental step load (ISL) testing methodology

Incremental step load (ISL) technique was used to determine the material susceptibility of three different grades of tempered martensite steels 35CrMo4, 41Cr4 and 36NiCrMo4 to hydrogen embrittlement (HE). In addition to testing the steel grades in air, the environmental hydrogen embrittlement suscep...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-02, Vol.716, p.189-207
Main Authors: Das, Tuhin, Rajagopalan, Sriraman K., Brahimi, Salim V., Wang, Xiang, Yue, Stephen
Format: Article
Language:English
Subjects:
Cementite
Chromium steels
Desorption
Hydrogen
Hydrogen embrittlement
Incremental step load test
Interfaces
Manganese
Material susceptibility
Morphology
Studies
Tempered martensite
Test procedures
Thermal desorption analysis
Transmission electron microscopy
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Summary:Incremental step load (ISL) technique was used to determine the material susceptibility of three different grades of tempered martensite steels 35CrMo4, 41Cr4 and 36NiCrMo4 to hydrogen embrittlement (HE). In addition to testing the steel grades in air, the environmental hydrogen embrittlement susceptibilities (EHE) of each material were determined by in-situ charging of hydrogen at three different cathodic potentials −0.85 VSCE, −1VSCE and −1.2VSCE to obtain the entire threshold curves for these materials. Overall investigation implies that 35CrMo4 is more susceptible than 41Cr4 and 36NiCrMo4. The fracture surface morphology in case of 35CrMo4 is entirely intergranular at −1VSCE and −1.2VSCE showing the severity of embrittlement. The higher matrix-cementite interfaces along with high cementite and low manganese sulphide (MnS) inclusion content of 36NiCrMo4 influencing the hydrogen transport kinetics within the material are responsible for the lower material susceptibility. The thermal desorption analyses (TDA) further corroborate the observations.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.01.032