Fatigue Crack Growth of Cold Worked 304L Stainless Steel in Gaseous Hydrogen

T.C. Chen; C.T. Hsieh; L.W. Tsay

doi:10.4028/www.scientific.net/AMM.378.140

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 378Fatigue Crack Growth of Cold Worked 304L Stainless...

Fatigue Crack Growth of Cold Worked 304L Stainless Steel in Gaseous Hydrogen

Abstract:

The fatigue crack growth behaviors of cold worked 304L stainless steel (SS) in air and gaseous hydrogen were evaluated, and further compared with the base plate. Cold rolling caused a rise in surface hardness and induced austenite to martensite transformation of 304L SS. Despite of testing environment, the fatigue crack growth rate (FCGR) of the cold worked specimen was higher than that of the base metal. Furthermore, both kinds of specimens were susceptible to hydrogen-accelerated crack growth. Mainly quasi-cleavage fracture related with the strain-induced martensite together with separation along twin boundaries accounted for the accelerated crack growth of the specimens in hydrogen.