In this contribution, the current state of the knowledge for galvanized coatings on hot stamped steel is reviewed. The evolution of a galvanized coating on 22MnB5 steel during heating to the soaking temperature prior to hot stamping was investigated. The Zn-Fe phase formation in the coating occurring during the heat treatment was studied in detail. The stability of galvanized coating was assessed by studying the effect of different atmospheres during the heat treatment process. The results indicate that the evaporation of Zn can be prevented by heating the coated steel in an atmosphere that enables the formation of surface oxides. The formation of a thin Al oxide surface layer was found to be effective in preventing Zn evaporation at high temperatures. Furthermore, the influence of the galvanized coating on the formability of the 22MnB5 steel was investigated, with an emphasis on the liquid metal embrittlement of the high temperature austenitized steel.


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    Title :

    Galvanized coating evolution during hot stamping


    Additional title:

    Entwicklung der Verzinkungsschicht während des Presshärtens


    Contributors:


    Publication date :

    2011


    Size :

    8 Seiten, 7 Bilder, 15 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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