Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Autor(es)

Mansur, Vinicius Machado ^[1] ; de Figueiredo Mansur, Raquel Alvim ^[1] ; de Carvalho, Sheila Medeiros ^[2] ; Mota de Siqueira, Rafael Humberto ^[1] ; Fernandes de Lima, Milton Sergio ^[1]

Afiliação do(s) autor(es)

^[1] Inst Adv Studies, Photon Divison, BR-12228001 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Fed Espirito Santo, Dept Mech Engn, BR-29075910 Vitoria, ES - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HELIYON; v. 7, n. 12 DEC 2021.
• Citações Web of Science: 0

Resumo

Dual Phase steels are one of the most used advanced high-strength materials in the industry, due to its combination of a ductile ferritic matrix and disperse hard martensite islands, which provide outstanding mechanical properties for components to be cold stamped. This work investigated fiber laser welding applicability in Dual Phase 600 1.6 mm thick steel sheets, evaluating potential welding impacts on properties of the material for industrial applications. A first set of bead-on-plate welds was generated to define best parameters for subsequent tests. A second set was prepared, consisting of butt joints welded in the optimized condition. Weld microstructure was characterized as 100% martensitic at fusion zone (FZ), with growing fractions of ferrite at Heat Affected Zone (HAZ) as one moves away from fusion line. Hardness is around 60% higher at FZ than at BM, being maximum at supercritical HAZ due to its highly refined microstructure and HAZ softening was not observed. Tensile and Erichsen cupping tests presented similar strength results between welded and non-welded specimens, with slight ductility reduction. Finally, numeric simulations based on Finite Element Analysis were carried out to estimate temperature evolution, phase proportions, residual stresses and distortion levels, achieving excellent agreement with experimental results. (AU)

• Processo FAPESP: 19/25229-7 - Fabricação de estruturas de satélites de pequeno porte com uso de lasers
• Beneficiário: Rafael Humberto Mota de Siqueira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/11309-0 - Estudo, desenvolvimento e aplicação de processo híbrido: Manufatura Aditiva (Ma) + High Speed Machining/Grinding (HSM/G)
• Beneficiário: Reginaldo Teixeira Coelho
• Modalidade de apoio: Auxílio à Pesquisa - Temático