Fusion zone microstructure evolution of fiber laser welded press-hardened steels. (August 2016)

• Record Type: Journal Article
• Authors: Saha, Dulal Chandra; Biro, Elliot; Gerlich, Adrian P.; Zhou, Norman Y.
• Is Part Of: Scripta materialia. Volume 121(2016)
• Page Start: 18
• Page End: 22
• Publication Date: 2016-08
• Subjects: Press-hardened steel -- Fiber laser welding -- Coating mixing -- Transmission electron microscopy -- Nanoindentation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.04.032
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Fusion zone microstructures of fiber laser welded Al-Si coated press-hardened steels at pre- and post-press-hardened conditions were analyzed using transmission electron microscopy (TEM). TEM and nanoindentation studies suggest that dislocation-free δ-ferrite phase formed in the weld metal (by ingress of the Al-Si surface coating into the fusion zone) exhibits lower nanohardness compared to α-ferrite transformed after press hardening. The nanoscale properties of δ-ferrite, α-ferrite, and martensite and their crystallographic orientation relationships are reported. Graphical abstract: