Sinter hardening of low-alloy steels: influence of part geometry and physical properties of the material Online publication date: Sat, 07-Apr-2007
by Gian Filippo Bocchini, Maria Rosa Pinasco, Barbara Rivolta, Giuseppe Silva, Enrica Stagno
International Journal of Materials and Product Technology (IJMPT), Vol. 28, No. 3/4, 2007
Abstract: Assuming that the cooling rate of parts depends on thermal conductivity of the material and on the surface/volume ratio, a two-ways study has been carried out. Firstly, the isothermal surfaces have been calculated by a numerical method on parallelepipeds of constant cross section and varying height and weight. Microstructures, depending on isothermal surfaces predicted by the numerical model, agree with microhardness and mechanical properties. A maximum weight of about 200 grams has been observed to be apt to a full sinter-hardening process and the surface/volume ratio seems to be the critical driving factor. Numerical analysis and experimental tests show that the thermal diffusivity of sintered steels increases as porosity increases.
Online publication date: Sat, 07-Apr-2007
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