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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Structure and properties of an austenitic stainless steel AISI 316L grade ASTM F138 after low temperature plasma nitriding

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Author(s):
André Paulo Tschiptschin [1] ; Carlos Eduardo Pinedo [2]
Total Authors: 2
Affiliation:
[1] USP. Escola Politécnica. Departamento de Engenharia Metalúrgica e de Materiais
[2] Heat Tech Tecnologia em Tratamento Térmico e Engenharia de Superfície Ltda
Total Affiliations: 2
Document type: Journal article
Source: Rem: Revista Escola de Minas; v. 63, n. 1, p. 137-141, 2010-03-00.
Abstract

Austenitic stainless steels cannot be conventionally nitrided at temperatures near 550°C due to the intense precipitation of chromium nitrides in the diffusion zone. The precipitation of chromium nitrides increases the hardness but severely impairs corrosion resistance. Plasma nitriding allows introducing nitrogen in the steel at temperatures below 450°C, forming pre-dominantly expanded austenite (gN), with a crystalline structure best represented by a special triclinic lattice, with a very high nitrogen atomic concentration promoting high compressive residual stresses at the surface, increasing substrate hardness from 4 GPa up to 14 GPa on the nitrided case. (AU)

FAPESP's process: 03/10157-2 - Study the correlation between film deposition processes and the tribological properties of the resultant coatings
Grantee:Andre Paulo Tschiptschin
Support Opportunities: PRONEX Research - Thematic Grants