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Electron Beam Welding of Cold Rolled High‐Alloy TRIP/TWIP Steel Sheets
Author(s) -
Halbauer Lars,
Zenker Rolf,
Weidner Anja,
Buchwalder Anja,
Biermann Horst
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500086
Subject(s) - twip , welding , materials science , electron beam welding , metallurgy , microstructure , recrystallization (geology) , alloy , annealing (glass) , heat affected zone , ultimate tensile strength , scanning electron microscope , cathode ray , composite material , austenite , electron , geology , paleontology , physics , quantum mechanics
High‐alloy cold rolled TRIP/TWIP steels have a remarkable potential for crash‐relevant structures. Electron beam welding (EBW) can be regarded as being predestined for this purpose due to, among other factors, its locally limited heat input. The aim of this work is the characterization of the influence of the welding conditions on the chemical composition, the microstructure, and the mechanical properties of high‐alloy cold rolled TRIP/TWIP steels. Three CrMnNi steels are cold rolled and welded with different beam intensities. The microstructure of the weld seams (WS) and the heat‐affected zones (HAZs) is characterized by means of light microscopy and scanning electron microscopy (SEM). The mechanical properties of the welded joints are evaluated by hardness measurements and tensile testing. The weld seams are defect‐free and surrounded by narrow HAZs. The microstructures inside the HAZs exhibited recrystallization and reverse annealing effects and constituted the failure‐relevant area of the weld.