Influence of carbon content on the primary solidification mode of high strength steels in resistance spot welding conditions. (15th July 2016)

• Record Type: Journal Article
• Authors: Krajcarz, Florent; Gourgues-Lorenzon, A.-F.; Lucas, E.
• Is Part Of: Scripta materialia. Volume 120(2016)
• Page Start: 98
• Page End: 102
• Publication Date: 2016-07-15
• Subjects: Advanced high strength steels -- Welding -- Solidification microstructure -- Rapid solidification -- Thermokinetic modelling; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.04.011
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The primary solidification mode of resistance spot welds made of advanced high strength steels has been investigated as a function of carbon content. Electron backscatter diffraction and dendrite morphology analysis showed for the first time a transition from primary solidification into δ-ferrite (C ≤ 0.22 wt%) to primary solidification into austenite (C ≥ 0.29 wt%) with increasing carbon content. The description of this transition by using the so-called "interface response function" model is not fully satisfactory and strongly depends on input model parameters. Epitaxial growth from the heat-affected zone or from the slowly solidified zone could influence the solidification path. Graphical abstract: