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S-phase, or expanded austenite, is a corrosion resistant diffused hardened layer which can be created in austenitic stainless steels and cobalt–chromium(Co-Cr) alloys. It is a precipitate-free metastable supersaturated solid solution of nitrogen or carbon or both. S-phase layers formed on biomedical grade austenitic stainless steels have demonstrated significantly enhanced in-vitro wear and corrosion...
Plasma surface nitriding of 17-4 PH martensitic precipitation hardening stainless steels was conducted at 350 °C, 420 °C and 500 °C for 10 h using a DC plasma nitriding unit, and the surface properties of the plasma surface engineered samples were systematically evaluated. Experimental results have shown that the surface properties of the plasma nitrided layers in terms of hardness, wear resistance,...
During use, bio-implant materials like Ti-alloys need to endure and resist corrosion–wear. Here, a synergy between corrosion and wear takes place; wear is increased by the action of corrosion and corrosion is increased by the action of wear. In this paper, the corrosion response of SP700 (Ti–4.5Al–3V–2Fe–2Mo) and Ti–6Al–4V alloys, with and without surface treatments are described. Both kinds of alloy...
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