期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.09.092
关键词
Selective laser melting; Cr3C2/Fe nanocomposites; Carbides; Tensile strength
类别
资金
- National Natural Science Foundation of China [51505166, 51531003]
- National Key Research and Development Program Additive Manufacturing and Laser Manufacturing [2016YFB1100101]
- Program for RUST Academic Frontier Youth Team
This paper presents a study on the formation, microstructure and mechanical property of Cr3C2/Fe nano composites using selective laser melting (SLM). Scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile tests were conducted to investigate the influence of Cr3C2 particulates on the microstructure and mechanical properties. It was found that the porosity decreased when volumetric energy density increased from 27 to 37 J/mm(3), then rose to 55 J/mm(3). The results showed that the Cr3C2 particulates decomposed completely during SLM process and interacted with Fe matrix to form (alpha-Fe, Cr) solid solution and M(Fe, Cr)(23)C-6 carbides. In addition, due to the characteristic of rapid solidification, very fine grains were obtained throughout the composites. The tensile tests showed that the ultimate tensile strength could reach up to 1158 MPa.
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