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Strain Rate Effects on Hydrogen Embrittlement Characteristics of Notched 4340 Steel

Published online by Cambridge University Press:  16 May 2014

Mobbassar Hassan Sk  and
Ruel A Overfelt
Mobbassar Hassan Sk
Affiliation:
National Center of Excellence for Research in the Intermodal Transport Environment, Materials Engineering, Auburn University, Auburn, AL 36849, United States Tel.: +1 334 844 5940; fax: +1 334 844 3400, [email protected] , [email protected]
Ruel A Overfelt
Affiliation:
National Center of Excellence for Research in the Intermodal Transport Environment, Materials Engineering, Auburn University, Auburn, AL 36849, United States Tel.: +1 334 844 5940; fax: +1 334 844 3400, [email protected] , [email protected]
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Abstract

The effect of strain rate on hydrogen embrittlement of low alloy 4340 steel was studied using double-notched tensile samples electrochemically charged in-situ with hydrogen in 1N H2SO4 + 5 mg/l As2O3 solution. The mechanical response of samples with prior austenitic grain sizes of 10 and 40 μm and martensitic hardness of 43-52 HRC were examined after hydrogen charging times of 0-20 min. Increasing the strain rate for hydrogen charged samples resulted in decreased failure strains and increased evidence of brittle fracture. Brittle fracture surfaces for the harder samples showed primarily intergranular fracture while softer samples exhibited predominantly quasi-cleavage.

Keywords

embrittlementgrain boundarieshardness
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1650: Symposium JJ – Materials Fundamentals of Fatigue and Fracture , 2014 , mrsf13-1650-jj04-02
Copyright
Copyright © Materials Research Society 2014 

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References

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