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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2012.tde-06032013-144147
Document
Author
Full name
Silvio André de Lima Pereira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Monteiro, Waldemar Alfredo (President)
Andrade, Arnaldo Homobono Paes de
Vatavuk, Jan
Title in Portuguese
Estudo da influência da deformação plástica na cinética de nitretação em aços inoxidáveis AISI 304 e 316
Keywords in Portuguese
aços inoxidáveis austeníticos
austenita expandida
encruamento
MEV
nitretação
Abstract in Portuguese
Foi estudado o comportamento da nitretação de aços inoxidáveis austeniticos AISI 304 e 316 através de comparação entre diferentes graus de deformações anteriores aos processos de nitretações gasosa, plasma e líquida. A microestrutura, espessura, microdureza e microcomposição química foram avaliadas por técnicas de microscopia óptica, microdureza, microscopia eletrônica de varredura e difração de raios x. Por meio destas técnicas observou-se que deformações plásticas prévias não influenciaram diretamente na espessura da camada nitretada. Uma maior profundidade de difusão pode ser observada nos aços AISI 304. Além disso, duas camadas distintas podem ser identificadas como resultado dos tratamentos, uma formada por uma matriz de austenita expandida pelos átomos de nitrogênio e outra abaixo com menor espessura expandida por átomos de carbono.
Title in English
Effect of cold working on nitriding process of aisi 304 and 316 austenitic stainless steel
Keywords in English
austetic stainless steel
cold working
expanded austenitic
nitriding
SEM
Abstract in English
The nitriding behavior of AISI 304 and 316 austenitic stainless steel was studied by different cold work degree before nitriding processes. The microstructure, thickness, microhardness and chemical micro-composition were evaluated through optical microscopy, microhardness, scanner electronic microscopy and x ray diffraction techniques. Through them, it was observed that previous plastic deformations do not have influence on layer thickness. However, a nitrided layer thicker can be noticed in the AISI 304 steel. In addition, two different layers can be identified as resulted of the nitriding, composited for austenitic matrix expanded by nitrogen atoms and another thinner imediatelly below expanded by Carbon atoms.
 
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2012PereiraEstudo.pdf (3.39 Mbytes)
Publishing Date
2013-03-26
 
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