Assessment of the cavitation erosion resistance in high nitrogen austenitic stainless steels: study of the wear mechanisms


Autoria(s): Grajales, Dairo Hernan Mesa; Garzon, Carlos Mario; Tschiptschin, Andre Paulo
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2010

Resumo

Specimens of a UNS S31803 steel were submitted to high temperature gas nitriding and then to vibratory pitting wear tests. Nitrided samples displayed fully austenitic microstructures and 0.9 wt. % nitrogen contents. Prior to pitting tests, sample texture was characterized by electron backscattering diffraction, EBSD. Later on, the samples were tested in a vibratory pit testing equipment using distilled water Pitting tests were periodically interrupted to evaluate mass loss and to characterize the surface wear by SEM observations. At earlier pit erosion, stages intense and highly heterogeneous plastic deformation inside individual grains was observed. Later on, after the incubation period, mass loss by debris detachment was observed. Initial debris micro fracturing was addressed to low cycle fatigue. Damage started at both sites, inside the grains and grain boundaries. The twin boundaries were the most prone to mass-loss incubation. Grains with (101) planes oriented near parallel to the sample surface displayed higher wear resistance than grains with other textures. This was attributed to lower resolved stresses for plastic deformation inside the grains with (101)

surface texture.

Identificador

Rem: Revista Escola de Minas, Ouro Preto, v.63, n.1, p.147-152, 2010

0370-4467

http://producao.usp.br/handle/BDPI/18425

http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&UT=000276843600029&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord

Idioma(s)

por

Publicador

ESCOLA DE MINAS

Relação

Rem: Revista Escola de Minas

Direitos

closedAccess

Copyright ESCOLA DE MINAS

Palavras-Chave #Pit erosion #high nitrogen stainless steels #grain boundary engineering #wear #meso-texture #BEHAVIOR #Engineering, Civil #Metallurgy & Metallurgical Engineering #Mining & Mineral Processing
Tipo

article

original article

publishedVersion