期刊
APPLIED SURFACE SCIENCE
卷 256, 期 22, 页码 6782-6786出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2010.04.089
关键词
LSM; Stainless steel; Hexagon; Morphology; HRTEM; Microhardness
类别
资金
- China Postdoctoral Science Foundation [20090461069, 20090461070]
- Scientific Research Starting-Foundation of Jiangsu University [10JDG029, 10JDG030]
- National Natural Science Foundation of China [50735001, 50705038]
The laser surface melting (LSM) technique was adopted to modify the surface layer microstructure of the AISI 304 stainless steel in this paper. The results showed that the hexagonal morphologies have been successfully fabricated on the surface after LSM. These hexagons had side lengths of about 0.5-1 mu m and were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), field emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (HRTEM). It was proved by the XRD that the stainless steel surface mainly consisted of gamma-Fe, Cr2O3, Fe2O3 and some manganese oxides. The FESEM micrographs showed that the hexagonal oxides were regular hexagons in geometry. The HRTEM micrographs also indicated the presence of the hexagons on the surface of the stainless steel. The spacing values were calculated from the HRTEM micrograph and the SAED pattern, and the hexagonal oxide phases determined by these spacing values were consistent with those verified by the XRD. After LSM, the microhardness of the stainless steel was significantly improved. (C) 2010 Elsevier B.V. All rights reserved.
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