Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 831, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142276
Keywords
Selective laser melting; Co-based superalloy; Hierarchical microstructure; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51931003]
- China Postdoctoral Science Foundation [2020M680223]
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In this study, the GH5188 Co-based superalloy was fabricated using selective laser melting (SLM) and showed a hierarchical microstructure with fine cells and excellent mechanical properties. Compared to forging and casting samples, the SLM-fabricated GH5188 superalloy exhibited superior performance in terms of nano-hardness, strength, and ductility, indicating promising potential for practical applications.
In this paper, the GH5188 Co-based superalloy was fabricated by selective laser melting (SLM), and its microstructure was systematically investigated. A typical hierarchical microstructure with a < 001 > texture along the building direction is formed during SLM, and each elongated grain consisted of extremely fine (<1 mu m) cells. Meanwhile, the cell boundaries were enriched with W, Cr, and Mn, while Ni was diluted, which formed fine M23C6/M6C eutectic carbides (similar to 80 nm). Nano-indentation tests and tensile tests were applied to test the mechanical properties. The as-SLM samples exhibited excellent performance as well as nano-hardness, strength, and ductility when compared to forging and casting samples. These results suggested promising potential for SLMfabricated GH5188 superalloy parts.
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