Formation and microstructural characterisation of S-phase layers in Ni-free austenitic stainless steels by low-temperature plasma surface alloying

被引：49

作者：

Buhagiar, Joseph ^{[1
]}

Li, Xiaoying ^{[1
]}

Dong, Hanshan ^{[1
]}

机构：

[1] Univ Birmingham, Coll Engn & Phys Sci, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

来源：

SURFACE & COATINGS TECHNOLOGY | 2009年 / 204卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

S-phase; Expanded austenite; Nickel free austenitic stainless steel; Plasma nitriding; Plasma carburising; Medical austenitic stainless steel; IN-VITRO; NITROGEN; CORROSION; CARBON; RESISTANCE; WEAR;

D O I：

10.1016/j.surfcoat.2009.07.030

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：330 / 335

页数：6

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