Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating

Advanced high-strength steels protected by zinc coatings have contributed to a reduction in CO<sub>2</sub> emissions in the automotive industry. However, the liquid metal embrittlement (LME) of the Fe/Zn couple induced by simultaneously acting stresses and high temperatures during resist...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Vojtech Kucera, Zuzana Zofkova, Christopher DiGiovanni, Liu He, Dalibor Vojtěch
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	liquid metal embrittlement resistance spot welding jet vapor deposition martensitic steel Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/aa9775966d7645ee8c8c30e6019905b6
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:aa9775966d7645ee8c8c30e6019905b6
record_format	dspace
spelling	oai:doaj.org-article:aa9775966d7645ee8c8c30e6019905b62021-11-25T18:22:09ZInvestigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating10.3390/met111118132075-4701https://doaj.org/article/aa9775966d7645ee8c8c30e6019905b62021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1813https://doaj.org/toc/2075-4701Advanced high-strength steels protected by zinc coatings have contributed to a reduction in CO<sub>2</sub> emissions in the automotive industry. However, the liquid metal embrittlement (LME) of the Fe/Zn couple induced by simultaneously acting stresses and high temperatures during resistance spot welding could be the cause of unexpected failure. We investigated the possible risk of LME in spot-welded martensitic steel with Zn jet vapor-deposited coating and its influence on weld strength. The weld nugget cross-sections were analyzed (optical microscopy, SEM-EDS), and their tensile shear strengths were compared with their uncoated counterparts. LME cracks were observed in all samples meeting the process window (6, 6.5, 7 kA) located at the edge of the sheet/electrode indentation area. The frequency and length of cracks increased with current, and the occurrence of Zn within cracks indicated the LME mechanism. The shear tests showed the Zn-coated sample underwent a decrease in tensile shear strength that was most evident at a welding current of 7 kA (13.2%). However, LME was excluded as a cause of lower strength. The decrease was attributed to the smaller nugget diameter and the thin slit of Zn coating remaining in the weld notch.Vojtech KuceraZuzana ZofkovaChristopher DiGiovanniLiu HeDalibor VojtěchMDPI AGarticleliquid metal embrittlementresistance spot weldingjet vapor depositionmartensitic steelMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1813, p 1813 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	liquid metal embrittlement resistance spot welding jet vapor deposition martensitic steel Mining engineering. Metallurgy TN1-997
spellingShingle	liquid metal embrittlement resistance spot welding jet vapor deposition martensitic steel Mining engineering. Metallurgy TN1-997 Vojtech Kucera Zuzana Zofkova Christopher DiGiovanni Liu He Dalibor Vojtěch Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
description	Advanced high-strength steels protected by zinc coatings have contributed to a reduction in CO<sub>2</sub> emissions in the automotive industry. However, the liquid metal embrittlement (LME) of the Fe/Zn couple induced by simultaneously acting stresses and high temperatures during resistance spot welding could be the cause of unexpected failure. We investigated the possible risk of LME in spot-welded martensitic steel with Zn jet vapor-deposited coating and its influence on weld strength. The weld nugget cross-sections were analyzed (optical microscopy, SEM-EDS), and their tensile shear strengths were compared with their uncoated counterparts. LME cracks were observed in all samples meeting the process window (6, 6.5, 7 kA) located at the edge of the sheet/electrode indentation area. The frequency and length of cracks increased with current, and the occurrence of Zn within cracks indicated the LME mechanism. The shear tests showed the Zn-coated sample underwent a decrease in tensile shear strength that was most evident at a welding current of 7 kA (13.2%). However, LME was excluded as a cause of lower strength. The decrease was attributed to the smaller nugget diameter and the thin slit of Zn coating remaining in the weld notch.
format	article
author	Vojtech Kucera Zuzana Zofkova Christopher DiGiovanni Liu He Dalibor Vojtěch
author_facet	Vojtech Kucera Zuzana Zofkova Christopher DiGiovanni Liu He Dalibor Vojtěch
author_sort	Vojtech Kucera
title	Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
title_short	Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
title_full	Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
title_fullStr	Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
title_full_unstemmed	Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating
title_sort	investigation of liquid metal embrittlement during resistance spot welding of martensitic steel with zn jet vapor-deposited coating
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/aa9775966d7645ee8c8c30e6019905b6
work_keys_str_mv	AT vojtechkucera investigationofliquidmetalembrittlementduringresistancespotweldingofmartensiticsteelwithznjetvapordepositedcoating AT zuzanazofkova investigationofliquidmetalembrittlementduringresistancespotweldingofmartensiticsteelwithznjetvapordepositedcoating AT christopherdigiovanni investigationofliquidmetalembrittlementduringresistancespotweldingofmartensiticsteelwithznjetvapordepositedcoating AT liuhe investigationofliquidmetalembrittlementduringresistancespotweldingofmartensiticsteelwithznjetvapordepositedcoating AT daliborvojtech investigationofliquidmetalembrittlementduringresistancespotweldingofmartensiticsteelwithznjetvapordepositedcoating
_version_	1718411279185477632

Investigation of Liquid Metal Embrittlement during Resistance Spot Welding of Martensitic Steel with Zn Jet Vapor-Deposited Coating

Ejemplares similares