S‐phase surface engineering of Fe‐Cr, Co‐Cr and Ni‐Cr alloys
Author: Dong, H
Source: International Materials Reviews, Volume 55, Number 2, March 2010 , pp. 65-98(34)
Publisher: Maney Publishing
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Stainless steel, Co‐Cr and Ni‐Cr alloys have played an important role in many industrial sectors to combat environmental degradation. However, low hardness and poor wear properties have impeded their tribological and tribochemical applications. Conventional thermochemical treatments can be used to significantly harden these passive alloys but at the expense of their corrosion resistance due to precipitation induced depletion of Cr in the matrix. Research in 1980s led to the discovery of a new expanded austenite phase, i.e. so called S‐phase with combined improvement in wear and corrosion resistance. Recent research has revealed that S‐phase can be formed not only in stainless steels but also in Co‐Cr alloys and Ni‐Cr alloys. It is the purpose of this paper to critically review the S‐phase surface engineering of stainless steels, Co‐Cr alloys and Ni‐Cr alloys. Particular attention will be paid to the structure, formation conditions, supersaturation, hardening mechanisms and metastability of S‐phase. Based on the discussion of the chemical, mechanical, tribological and tribochemical properties of S‐phase, the importance of the S‐phase surface engineering technology is demonstrated by examples. Finally, future directions towards more stable and thicker S‐phase layers will be discussed.
Document Type: Original Article
Affiliations: School of Metallurgy and Materials, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham B15 2TT, UK
Publication date: 2010-03-01
International Materials Review has four previous titles in the archive. Please see the original title Metallurgical Reviews for volumes 1 to 16, International Metallurgical Reviews for volumes 17 to 20, and International Metals Reviews for volumes 21 to 31.
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