Scratch Response of Hollow Cathode Radiofrequency Plasma-Nitrided and Sintered 316L Austenitic Stainless Steel
Source abstract
Abstract
Low-temperature plasma nitriding is a thermochemical surface treatment that promotes surface hardening and wear resistance enhancement without compromising the corrosion resistance of sintered austenitic stainless steels. Hollow cathode radiofrequency (RF) plasma nitriding was conducted to evaluate the influence of the working pressure and nitriding time on the microstructure and thickness of the nitrided layers. A group of samples of sintered 316L austenitic stainless steel were plasma-nitrided at 400 °C for 4 h, varying the working pressure from 160 to 25 Pa, and the other group was treated at the same temperature, varying the nitriding time (2 h and 4 h) while keeping the pressure at 25 Pa. A higher pressure resulted in a thinner, non-homogeneous nitrided layer with an edge effect. Regardless of the nitriding duration, the lowest pressure (25 Pa) promoted the formation of a homogenously nitrided layer composed of nitrogen-expanded austenite that was free of iron or chromium nitride and harder and more scratching-wear-resistant than the soft steel substrate.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Diamond and Carbon-based Materials Research · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Graduate Program in Materials Science and Engineering, University of Caxias do Sul, UCS, Rua Francisco Getúlio Vargas, 1130, Caxias do Sul 95070-560, RS, Brazil
Instituto Federal de Educação Ciência e Tecnologia do Rio Grande do Sul, IFRS, 1730 Avelino Antônio de Souza St, Caxias do Sul 95043-700, RS, Brazil
Surface Phenomena Laboratory, Escola Politécnica, University of Sao Paulo, Av. Prof. Mello Moraes, 2231, São Paulo 05508-030, SP, Brazil
Funding
Higher Education Personnel (CAPES) · National Council for Scientific and Technological Development (CNPq)
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