Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/215472 |
Resumo: | Continuous cooling bainitic steels has been widely used in industrial processes owing to its excellent mechanical properties and toughness. Although the surface properties of them are acceptable for many purposes, for their use in mechanical components like gears, it is necessary to improve their surface properties. Plasma nitriding treatments was carried out of a DIN 18MnCrSiMo6-4 steel at 500 °C, with three different nitrogen gas composition: 76, 24 and 5 vol.% nitrogen in hydrogen, for 3, 6 and 9 hours. The surfaces were characterized concerning the microstructure, microhardness, fracture toughness, nitrogen concentration and carbon composition, phase composition and residual stress states. Based on the results presented, layer growth constants (k) for different nitrogen gas composition was determined. The carbon profiles of samples indicate that there was decarburization during the plasma nitriding. The nitrided samples with thicker compound layers presented a fracture behavior dominated by the formation of Palmqvist cracks. X-ray phase analysis indicated the formation of biphasic compound layer on the surface of all nitrided samples with 76 and 24 vol.% nitrogen, while the nitrided samples with 5 vol.% nitrogen indicated the formation of monophasic compound layer. The diffusion zone presented compressive residual stresses with highest values near the surface. |
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Dalcin, Rafael LucianoOliveira, Leonardo FonsecaSoares, Carla Adriana TheisRocha, Alexandre da Silva2020-11-25T04:07:19Z20201516-1439http://hdl.handle.net/10183/215472001118605Continuous cooling bainitic steels has been widely used in industrial processes owing to its excellent mechanical properties and toughness. Although the surface properties of them are acceptable for many purposes, for their use in mechanical components like gears, it is necessary to improve their surface properties. Plasma nitriding treatments was carried out of a DIN 18MnCrSiMo6-4 steel at 500 °C, with three different nitrogen gas composition: 76, 24 and 5 vol.% nitrogen in hydrogen, for 3, 6 and 9 hours. The surfaces were characterized concerning the microstructure, microhardness, fracture toughness, nitrogen concentration and carbon composition, phase composition and residual stress states. Based on the results presented, layer growth constants (k) for different nitrogen gas composition was determined. The carbon profiles of samples indicate that there was decarburization during the plasma nitriding. The nitrided samples with thicker compound layers presented a fracture behavior dominated by the formation of Palmqvist cracks. X-ray phase analysis indicated the formation of biphasic compound layer on the surface of all nitrided samples with 76 and 24 vol.% nitrogen, while the nitrided samples with 5 vol.% nitrogen indicated the formation of monophasic compound layer. The diffusion zone presented compressive residual stresses with highest values near the surface.application/pdfengMaterials research : ibero-american journal of materials. São Carlos, SP. Vol. 23, no. 5 (2020), e20200269, 11 p.AçoNitretação a plasmaResistência à fraturaAnálise de tensõesFratura (Engenharia)DIN 18MnCrSiMo6-4 steelPlasma nitridingLayer growth constantFracture toughnessPhase composition and residual stress analysisResponse of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixturesinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001118605.pdf.txt001118605.pdf.txtExtracted Texttext/plain46779http://www.lume.ufrgs.br/bitstream/10183/215472/2/001118605.pdf.txt3609d97e641385fafff5beee21d824caMD52ORIGINAL001118605.pdfTexto completo (inglês)application/pdf1949295http://www.lume.ufrgs.br/bitstream/10183/215472/1/001118605.pdfe597f06c30d3e81ab742ed3dc1b0462aMD5110183/2154722021-03-09 04:46:38.614959oai:www.lume.ufrgs.br:10183/215472Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-03-09T07:46:38Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
title |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
spellingShingle |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures Dalcin, Rafael Luciano Aço Nitretação a plasma Resistência à fratura Análise de tensões Fratura (Engenharia) DIN 18MnCrSiMo6-4 steel Plasma nitriding Layer growth constant Fracture toughness Phase composition and residual stress analysis |
title_short |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
title_full |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
title_fullStr |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
title_full_unstemmed |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
title_sort |
Response of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel to different plasma nitriding gas mixtures |
author |
Dalcin, Rafael Luciano |
author_facet |
Dalcin, Rafael Luciano Oliveira, Leonardo Fonseca Soares, Carla Adriana Theis Rocha, Alexandre da Silva |
author_role |
author |
author2 |
Oliveira, Leonardo Fonseca Soares, Carla Adriana Theis Rocha, Alexandre da Silva |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Dalcin, Rafael Luciano Oliveira, Leonardo Fonseca Soares, Carla Adriana Theis Rocha, Alexandre da Silva |
dc.subject.por.fl_str_mv |
Aço Nitretação a plasma Resistência à fratura Análise de tensões Fratura (Engenharia) |
topic |
Aço Nitretação a plasma Resistência à fratura Análise de tensões Fratura (Engenharia) DIN 18MnCrSiMo6-4 steel Plasma nitriding Layer growth constant Fracture toughness Phase composition and residual stress analysis |
dc.subject.eng.fl_str_mv |
DIN 18MnCrSiMo6-4 steel Plasma nitriding Layer growth constant Fracture toughness Phase composition and residual stress analysis |
description |
Continuous cooling bainitic steels has been widely used in industrial processes owing to its excellent mechanical properties and toughness. Although the surface properties of them are acceptable for many purposes, for their use in mechanical components like gears, it is necessary to improve their surface properties. Plasma nitriding treatments was carried out of a DIN 18MnCrSiMo6-4 steel at 500 °C, with three different nitrogen gas composition: 76, 24 and 5 vol.% nitrogen in hydrogen, for 3, 6 and 9 hours. The surfaces were characterized concerning the microstructure, microhardness, fracture toughness, nitrogen concentration and carbon composition, phase composition and residual stress states. Based on the results presented, layer growth constants (k) for different nitrogen gas composition was determined. The carbon profiles of samples indicate that there was decarburization during the plasma nitriding. The nitrided samples with thicker compound layers presented a fracture behavior dominated by the formation of Palmqvist cracks. X-ray phase analysis indicated the formation of biphasic compound layer on the surface of all nitrided samples with 76 and 24 vol.% nitrogen, while the nitrided samples with 5 vol.% nitrogen indicated the formation of monophasic compound layer. The diffusion zone presented compressive residual stresses with highest values near the surface. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-11-25T04:07:19Z |
dc.date.issued.fl_str_mv |
2020 |
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http://hdl.handle.net/10183/215472 |
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1516-1439 |
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001118605 |
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url |
http://hdl.handle.net/10183/215472 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Materials research : ibero-american journal of materials. São Carlos, SP. Vol. 23, no. 5 (2020), e20200269, 11 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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