Effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel

Abstract

Abstract: To provide data for improved modelling of the behaviour of steel components in a simultaneous forming and quenching process, the effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel were investigated. It was found that plastic deformation of austenite at high temperatures enhances ferrite formation significantly, and consequently the dilatation decreases markedly even at a cooling rate of 280 degreesC/s. The created ferritic-martensitic microstructure possesses clearly lower hardness and strength than the martensitic structure. Elastic stresses cause the preferred orientation in martensite to be formed so that diametric dilatation can increase by nearly 200% under axial compression.

Key words:

M. C.Somani, L.P.Karjalainen, M. Oldenburg, M.Eriksson. Effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel[J]. J Mater Sci Technol, 2001, 17(02): 203-206.

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Effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel

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