Microstructure and tensile properties of laser engineered net shaped reduced activation ferritic/martensitic steel
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819 (China)
- Key Laboratory of Fundamental Science for National Defence of Aerouautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136 (China)
Highlights: • A RAFM steel has been successfully manufactured by laser engineered net shaping (LENS), which is one of laser additive manufacturing technologies. • Columnar dendrites in vertical section and a mixture of equiaxed and columnar grains in horizontal section have been observed. • The anisotropic tensile properties are induced by LENS process, which can be eliminated well through the heat treatment. - Abstract: A laser additive manufacturing technique, laser engineered net shaping (LENS), was successfully applied to manufacture a reduced activation ferritic/martensitic (RAFM) steel with nominal composition of Fe-9Cr-0.11C-1.5W-0.4Mn-0.2V-0.12Ta (wt%). The as-deposited LENS-RAFM steels were normalized and tempered. The microstructures of as-deposited and heat treated LENS-RAFM steels were characterized by using optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The tensile tests of as-deposited and heat treated samples in different directions were carried out at room temperature and 873 K. The results showed that columnar dendrites grow epitaxially along the direction of deposition in vertical section (YOZ) and a mixture of equiaxed and columnar grains appears in horizontal section (XOY). No precipitates are observed in the as-deposited sample while Cr-rich M{sub 23}C{sub 6} and Ta-rich MX type carbides appear in the heat treated sample. The as-deposited sample showed anisotropic tensile properties which could be eliminated by heat treatment. The tensile strength of the LENS-RAFM steel is similar to conventional RAFM steels such as EUROFER 97 and CLAM.
- OSTI ID:
- 22805821
- Journal Information:
- Materials Characterization, Vol. 144; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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