The paper deals with classification of steel sheets on the base of strength and structural characteristics in automative industry. Experimental works were aimed to obtain the best strengthening parameters as work hardening and solid solution ferrite hardening are from interstitial carbon atoms during paint-baking of auto body. Hardening process from interstitial atoms is realized as two-step process. First step is BH (bake hardening) effect made by interaction of interstitial atoms with dislocations. The Cottrels atmosphere is obtained. Second step of BH effect is produced by precipitation hardening from microalloyed elements. WH (work hardening) effect is obtained by plastic deformations during sheet deep drawing. Experimental works referred to the achievement such plastic material properties after cold rolling, annealing and skin-pass rolling, which classify the material ZStE 220 BH after this treatment to drawing categories on the level DQ - DDQ. The optimal treatment conditions, which are result of experimental works, for maximization of sum (WH+BH) effects are the following: summary cold rolling deformation Gold = 65 %, annealing temperature Tmal = 700 degree C at the maximum sum (WH+BH) = 86 MPa.


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    Title :

    Influence of plastic deformation and annealing conditions on BH effect development


    Contributors:
    Kvackaj, T. (author) / Pokorny, I. (author)


    Publication date :

    2003


    Size :

    9 Seiten, 10 Bilder, 12 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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