Sinter hardening of low-alloy steels: influence of part geometry and physical properties of the material
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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