Mechanical characterisation of hydrogen-induced quasi-cleavage in a metastable austenitic steel using micro-tensile testing. (1st March 2016)

• Record Type: Journal Article
• Authors: Mine, Yoji; Koga, Kaoru; Kraft, Oliver; Takashima, Kazuki
• Is Part Of: Scripta materialia. Volume 113(2016)
• Page Start: 176
• Page End: 179
• Publication Date: 2016-03-01
• Subjects: Micromechanical characterisation -- Austenitic steels -- Hydrogen embrittlement -- Martensitic phase transformation -- Metastable phase; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.11.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Micro-tensile tests were performed using single- and twinned bi-crystals with and without hydrogen pre-charging in a metastable austenitic steel to elucidate the occurrence of hydrogen-induced quasi-cleavage. The hydrogen-charged specimens exhibited in the stress–strain behaviour a stress decrease in the plateau region after yielding. In this stage, a lamellar microstructure of martensite was formed within the parent austenite. Fracture occurred as quasi-cleavage along the habit planes of the martensite lamellae. A mechanism is proposed where the excess hydrogen generated by the martensitic transformation of hydrogen-containing austenite concentrates into the retained austenite between the martensite laths, promoting the localised deformation to fracture. Graphical abstract: