期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138341
关键词
Additive manufacturing; Hydrogen embrittlement; High-energy X-ray diffraction; Martensitic transformation
类别
资金
- National Key Research and Development Program of China [2017YFA0403804]
- National Natural Science Foundation of China (NSFC) [51601013, 51527801]
- State Key Laboratory for Advanced Metals and Materials [2018Z-25]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
The microstructures and mechanical properties of additively manufactured (AM) maraging steel were investigated before and after hydrogen charging. The hydrogen-charged specimen suffers severe hydrogen embrittlement and its strength and plasticity decline obviously. The mechanism of ductile-to-brittle transition of AM maraging steel after hydrogen charging was studied by in situ high energy X-ray diffraction and electron backscatter diffraction techniques. Martensitic transformation occurs in the hydrogen-charged specimen under low stress. The premature phase transformation along with hydrogen-induced microcracks resulting in the brittle fracture of the hydrogen-charged specimen.
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