Method for making a steel part of multiphase microstructure

Details Method for making a steel part of multiphase microstructure Method for making a steel part of multiphase microstructure

C - Chemistry, Metallurgy

21

D

C21D 1/18 (2006.01) C21D 1/673 (2006.01) C21D 7/13 (2006.01) C23C 2/26 (2006.01)

Patent

CA 2623146

The invention concerns a method for making a steel part of multiphase microstructure, said microstructure comprising ferrite and being homogeneous in each of the zones of said part, including the following steps: cutting a blank in a steel strip whereof the composition is typical of that of multiphase microstructure steel; heating said blank until a holding temperature T1 higher than Ac1 but lower than Ac3 is reached, and maintaining said holding temperature T1 for a dwell time M adjusted so that the steel after the blank has been heated includes an austenite proportion not less than 25 % of the surface; transferring said heated blank into a shaping equipment so as to shape by heat process said part; and cooling the part inside the equipment at a cooling speed V such that the steel microstructure after the part has been cooled is a multiphase microstructure, said microstructure comprising ferrite and being homogeneous in each of the zones of said part.

L'invention a pour objet un procédé de fabrication d'une pièce en acier présentant une microstructure multi-phasée, ladite microstructure comprenant de la ferrite et étant homogène dans chacune des zones de ladite pièce, comprenant les étapes consistant à : découper un flan dans une bande en acier dont la composition est typique de celle des aciers de microstructure multi- phasée ; chauffer ledit flan jusqu'à atteindre une température de maintien T1 supérieure à Ac1 mais inférieure à Ac3, et le maintenir à cette température de maintien T1 pendant un temps de maintien M ajusté de manière à ce que l'acier après chauffage du flan comprenne une proportion d'austénite supérieure ou égale à 25 % surfacique ; transférer ledit flan chauffé au sein d'un outillage de mise en forme de manière à former à chaud ladite pièce ; et refroidir la pièce au sein de l'outillage avec une vitesse de refroidissement V telle que la microstructure de l'acier après refroidissement de la pièce soit une microstructure multi-phasée, ladite microstructure comprenant de la ferrite et étant homogène dans chacune des zones de ladite pièce.

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