期刊
ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 31, 期 1, 页码 19-26出版社
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-017-0668-2
关键词
Graded steel; Direct laser metal deposition; Electron backscatter diffraction (EBSD); Anisotropy of mechanical properties
资金
- National Key Research and Development Program of China [2016YFB1100204, 2013ZX06002-002]
- Shenyang Science and Technology [17-29-2-00, Y17-1-031, Z17-2-002]
- Youth Foundation of School of Stomatology, China Medical University [K101593-17-05]
Direct laser metal deposition is a kind of advanced rapid manufacturing technology, which can produce near net shape parts by depositing metal powders layer by layer. This study demonstrates fabrication, the anisotropy of mechanical properties and hardness of a graded steel. The characteristics of constituent phases, microstructure, mechanical anisotropy, and microhardness were investigated using electron backscatter diffraction, optical microscopy, tensile test machine, and microhardness tester. It was found that the graded steel is dense and free of cracks. The crystal structures of the as-built samples evolved in three grades from fcc structures to fcc ? bcc structures and then to bcc ? fcc structures. Samples in x and z directions showed obvious mechanical anisotropy. The samples machined in x direction showed higher strength and lower elongation than those machined in z direction due to the presence of lack-of-fusion pores and the higher metallurgical bonding between layers in the x direction. The microhardness of the as-built samples increased along the cross section from the substrate (159.7 HV) to the top surface (545.4 HV).
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