The Use of Tool Steels: Experience and Research (Proc. of the 6h International Tooling Conference) (Eds. J. Bergström, G. Fredriksson, M. Johansson, O. Kotik, F. Thuvander), pp. 415-424, 2002


H.J. Böhm, T. Drabek, A. Eckschlager

Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria

Abstract - The thermomechanical behavior of high speed tool steels is studied by a continuum micromechanical approach. The simulations are based on three-dimensional unit cell models that contain a number of randomly positioned spherical carbides embedded in a thermoelastoplastic steel matrix. Models of this type allow effects of the geometrical arrangement of the primary carbides to be investigated for a wide range of loading conditions.
In the present study emphasis is put on modeling the thermal residual stresses caused by the thermal expansion mismatch between matrix and carbides. The predictions indicate that even though such thermal residual stresses can reach considerable magnitudes, their influence on the overall stiffness of tool steels typically is small and their effect on the strength also is minor.