期刊
APPLIED SURFACE SCIENCE
卷 254, 期 21, 页码 6779-6782出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.04.069
关键词
stainless steel; Nd : YAG pulsed laser; nano-crystalline; amorphous
Thin surface layers consisting of nano-crystalline and amorphous phases on the surface of stainless steel have been attained under the Nd:YAG pulsed laser irradiation. The phases and microstructures were investigated by X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM). The phase compositions of the surface determined by XRD were alpha-Fe (ferrite) and gamma-Fe (austenite) or only gamma-Fe in the near surface region on the bases of the different laser power densities. The nano-crystalline grains with sizes of 4-100 nm could result from high cooling rate and crystallization in amorphous region by homogeneous and heterogeneous nucleation. The formation of the amorphous phase was attributed to the higher cooling rates. (C) 2008 Elsevier B. V. All rights reserved.
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