期刊
SURFACE & COATINGS TECHNOLOGY
卷 204, 期 3, 页码 330-335出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.07.030
关键词
S-phase; Expanded austenite; Nickel free austenitic stainless steel; Plasma nitriding; Plasma carburising; Medical austenitic stainless steel
资金
- EPSRC, UK [EP/C53606/1]
- NSFC, China [50735006]
The feasibility of generating S-phase surface layers in nickel-free austenitic stainless steels by plasma surface alloying with nitrogen (at 430 degrees C), carbon (at 430 degrees C and 500 degrees C) and both carbon and nitrogen (at 430 degrees C) has been investigated. The structure, microstructure and composition of the plasma-alloyed surfaces were characterised by X-ray Diffraction (XRD), microscopy, Glow Discharge Optical Emission Spectroscopy (GDOES) and Transmission Electron Microscopy (TEM). The experimental results have demonstrated for the first time that the S-phase can be produced in the surface of nickel-free austenitic stainless steel by low-temperature plasma surface alloying. TEM analysis has revealed that when alloyed with carbon no precipitates can be found within the carbon-rich S-phase layer; however, when alloyed with nitrogen or both carbon and nitrogen some nitride precipitates (Mn(3)N(2) and Cr(2)N) were found within the nitrogen-rich S-phase layer. Based on experimental results, the response of Ni-free austenitic stainless steel to plasma surface alloying has been compared to the Ni-containing counterpart, and the role of nickel in the formation of S-phase in austenitic stainless steels has been discussed. (C) 2009 Elsevier B.V. All rights reserved.
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