Journal
MATERIALS TODAY COMMUNICATIONS
Volume 17, Issue -, Pages 1-14Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mtcomm.2018.07.011
Keywords
Steel; Hydrogen embrittlement; Martensite
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Funding
- Baosteel-Australia Joint Research & Development Centre (BAJC) [BA13037, BA16010]
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This work addresses the influence of microstructure on the hydrogen embrittlement of advanced high-strength steels. With sufficient hydrogen, fracture initiates at the ultimate tensile stress, but initiation is at the specimen surface. Fracture initiation is typically intergranular, transgranular or quasi-cleavage. These micro-fracture modes suggest that planar defects are important, such as prior austenite grain boundaries and lath and block boundaries. Fracture propagation is by shear fracture indicating a major influence of hydrogen-dislocation interactions. These hydrogen assisted fractures occur at a fast rate, probably approaching the speed of sound, that is at fracture velocities greater than 1000 m/s.
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