Microstructural and mechanical characterization of fiber laser welded quench-partitioning steels

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dc.authorid0000-0002-9378-3870
dc.contributor.authorCelik, Hafize
dc.contributor.authorSaray, Onur
dc.date.accessioned2026-02-08T15:15:47Z
dc.date.available2026-02-08T15:15:47Z
dc.date.issued2025
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractAdvanced high-strength steels (AHSS) are increasingly used in the automotive industry for lightweight components due to their superior mechanical properties. Quench and partitioning (QP) steels provide an optimal balance between strength and formability, but their susceptibility to liquid metal embrittlement (LME) during resistance spot welding presents challenges. Laser welding, with its low heat input and high efficiency, offers a promising solution for reducing LME risks while ensuring strong, reliable joints for automotive applications. This study investigates the microstructural changes and mechanical performance of laser-welded joints between QP and dual phase (DP) steels. The fusion zone (FZ) and supercritical heat-affected zone (HAZ) primarily exhibited martensitic microstructures, while the midcritical and subcritical HAZ contained tempered martensite and ferrite on the DP side and a combination of tempered martensite, ferrite, and retained austenite on the QP side. These microstructural transformations contributed to enhanced FZ and HAZ regions, resulting in defect-free welds. Fractures occurred within the softer base metal (BM) regions, exhibiting ductile fracture characteristics without significant strength loss. However, joint ductility was slightly reduced compared to BMs due to strain localization caused by microstructure and thickness variations. The results demonstrate that laser welding is an effective method for joining QP steels in automotive manufacturing.
dc.identifier.doi10.1515/mt-2024-0539
dc.identifier.endpage1399
dc.identifier.issn0025-5300
dc.identifier.issn2195-8572
dc.identifier.issue8
dc.identifier.scopus2-s2.0-105010270356
dc.identifier.scopusqualityQ2
dc.identifier.startpage1382
dc.identifier.urihttps://doi.org/10.1515/mt-2024-0539
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5964
dc.identifier.volume67
dc.identifier.wosWOS:001523989600001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWalter De Gruyter Gmbh
dc.relation.ispartofMaterials Testing
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzWOS_KA_20260207
dc.subjectadvanced high-strength steels (AHSS)
dc.subjectdual phase (DP) steels
dc.subjectfiber laser welding
dc.subjectmechanical and microstructural properties
dc.subjectquench - partitioning (QP) steels
dc.titleMicrostructural and mechanical characterization of fiber laser welded quench-partitioning steels
dc.typeArticle

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