Hydrogen Interactions With Austenite in Pre-Strained TRIP Steel

摘要

The effects of hydrogen on laboratory heat treated TRIP steel with UTS of 880 MPa and elongation to failure of 33 pet engineering strain were investigated. Samples were tensile pre-strained at -20, 23, and 102℃ to induce varying amounts of austenite to martensite transformation and then subsequently hydrogen charged with 1 to 2 ppm. Several techniques were used to characterize the role of austenite on the susceptibility to hydrogen embrittlement: thermal desorption analysis (TDA), hydrogen microprint technique (HMT), tensile testing, and SEM. Results of the analysis will be used to describe and understand the fundamental mechanisms of hydrogen interaction with retained austenite in a TRIP steel microstructure and will be applicable to automotive or other applications where austenite is present and hydrogen pick-up may occur.