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Weidner A.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Krewerth D.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Witschel B.,Institute of Materials ScienceTechnical University Bergakademie Freiberg09599FreibergGermany | Emmel M.,Institute of GlassCeramic and Construction MaterialsTechnical University Bergakademie Freiberg09599FreibergGermany | And 5 more authors.
Steel Research International | Year: 2016

Non-metallic inclusions can affect significantly the mechanical properties of metallic materials. Mainly for safety relevant components, it is important to reduce size and number of non-metallic inclusions. Recent research work is focused on the development of new reactive, active, and functionalized filters for the reduction of non-metallic inclusions. A detailed knowledge on the genesis of inclusions is essential to improve the entrapment capability. The paper is focused on the microstructure of inclusions formed in cast steel 42CrMo4 after the application of two filter variants. Both, inclusions on the filter surface as well as inclusions in the as-cast steel are investigated using scanning electron microscopy. Their chemical composition and their crystal structure are identified by combined EBSD and EDS measurements. The three-dimensional morphology of the inclusions is analyzed by deep etching technique as well. Finally, the clusters and agglomerates exhibit a quite complex microstructure. Thus, the majority of inclusion clusters consists of alumina, spinel, mullite, MnS, and TiOx. This agrees well to the scenario of the evolution of inclusions described in the literature. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Halbauer L.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Zenker R.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Weidner A.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Buchwalder A.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany | Biermann H.,Institute of Materials EngineeringTechnical University Bergakademie Freiberg09599FreibergGermany
Steel Research International | Year: 2015

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. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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