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Processing and Characterization of Beads with Graded Layer Compositions Based on Zirconia and TRIP?Steel

A new and innovative coating process of metal matrix beads containing austenitic stainless steel and magnesia partially stabilized zirconia fabricated using a gel?casting process by alginate gelation is presented. The coated beads show a significantly improved energy absorption capability with 10.7?kJ?kg–1 at a strain of 20%. Pure steel only exhibits a SEA of 5.2?kJ?kg–1.A new and innovative coating process of metal matrix beads fabricated using a gel?casting process by alginate gelation is presented. The suspensions contain austenitic stainless steel and magnesia partially stabilizes zirconia. The prepared beads are coated using two different methods ? spraying and dipping. Sintered beads with the used spray coating have an adequate compressive strength (?550?MPa), good surface quality, homogeneous microstructure, and high energy absorption capability. At lower strains (up to 20%), the spray coated beads obtain much higher specific energy absorption (SEA) in comparison to pure steel beads and in comparison to non?coated MMC beads based on 90 vol% steel and 10 vol% zirconia: the coated beads show a significantly improved energy absorption capability with 10.7?kJ?kg?1 at a strain of 20%. Pure steel only exhibits a SEA of 5.2?kJ?kg?1.

» Author: Marie Oppelt, Thomas Leißner, Harry Berek, Christine Baumgart, Lutz Krüger, Urs Peuker, Christos G. Aneziris

» Reference: doi:10.1002/adem.201800615

» Publication Date: 17/10/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609203].

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