Projects per year
Abstract
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.
Original language | English |
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Pages (from-to) | 65-98 |
Number of pages | 34 |
Journal | International Materials Reviews |
Volume | 55 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Mar 2010 |
Keywords
- Co-Cr alloys
- Stainless steel
- S-phase
- Ni-Cr alloys
- Review
- Expanded austenite
- Surface engineering
Fingerprint
Dive into the research topics of 'S-phase surface engineering of Fe-Cr, Co-Cr and Ni-Cr alloys'. Together they form a unique fingerprint.Projects
- 2 Finished
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Towards Anti-Microbial Multifunctional Stainless Steel Surfaces: Active-Screen Plasma Surface Alloying with C, N, Ag and Cu
Engineering & Physical Science Research Council
1/01/08 → 30/06/11
Project: Research Councils
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The Cryogenic Nano Mechanical and Tribological Properties of Bulk and Surface Engineered Polymeric and Metallic Materials
Dong, H. & Bell, T.
Engineering & Physical Science Research Council
1/10/05 → 31/03/10
Project: Research Councils