期刊
ADDITIVE MANUFACTURING
卷 45, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.addma.2021.102075
关键词
Ferritic/martensitic steel; Electron beam melting; Additive manufacturing
资金
- Toshiba Energy Systems and Solutions Corporation
- Japan Society for the Promotion of Science [18H03834]
- Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research (CRDAMIMR), Tohoku University [18G0418, 19G0411]
- Grants-in-Aid for Scientific Research [18H03834] Funding Source: KAKEN
Low-carbon 9-12Cr heat-resistant ferritic/martensitic steels were fabricated by SEBM using two types of powders, showing high tensile strength and fine lath martensitic microstructure. The high N content in one of the components resulted in higher strength and enhanced mechanical properties. SEBM is a suitable and rapid method for fabricating low-C martensite steels for use in power plants without welding.
Low-carbon 9-12Cr heat-resistant ferritic/martensitic steels were fabricated by SEBM using two types of powders (Ar gas- and N gas-atomized powders). Both the as-built Ar- and N-components showed a tempered and fine lathlike ferritic/martensitic microstructure, high tensile strength (approximately 1300 and 1167 MPa for the as-built N-component and the as-built Ar-component, respectively), and tensile elongation of approximately 8%. The high N content (0.44 wt%) of the as-built N-component resulted in a refined lath martensite phase and promoted the precipitation of a fine M2X phase which give rise to higher strength. SEBM is a suitable and rapid method for fabricating low-C martensite steels with a fine lath martensitic microstructure and enhanced mechanical properties for use in power plants without employing welding.
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