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Effect of Thermal Charging of Hydrogen on the Microstructure of Metastable Austenitic Stainless Steel
Author(s) -
Kim HanJin,
Phaniraj M. P.,
Kim JuHeon,
Lee YoungSu,
Kim DongIk,
Suh JinYoo,
Lee Joonho,
Shim JaeHyeok,
Park SeongJun
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600063
Subject(s) - materials science , austenite , hydrogen , microstructure , martensite , electron backscatter diffraction , metallurgy , austenitic stainless steel , ductility (earth science) , ultimate tensile strength , hydride , thermal desorption , composite material , analytical chemistry (journal) , desorption , metal , chemistry , creep , adsorption , corrosion , organic chemistry , chromatography
The tensile behavior of hydrogen‐charged 304‐type austenitic stainless steel, with and without prestrain, is investigated. The specimens are thermally charged with hydrogen in 15 MPa hydrogen gas at 300 °C for 72 h. Tensile behavior of the specimen is compared with the specimen aged in vacuum at 300 °C. The effect of the charging condition on the stability of microstructure is determined by characterizing prestrained specimens before and after charging. The hydrogen content in the specimens is determined using thermal desorption spectroscopy (TDS). Analysis of X‐ray diffraction (XRD) data and electron backscattered diffraction (EBSD) shows that the fraction of martensite increases after charging in hydrogen by 5–10%. The fracture surfaces of the uncharged and charged specimens are examined for characteristic features. Flow stress and ductility of the charged and prestrained and charged specimens are discussed in terms of the martensite fraction and hydrogen content.