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- W2184829300 abstract "A numerical approach has been adopted to investigate the influence of porosity and surface/volume ratio on the cooling rate of sinter-hardening steels. Parallelepipeds (rectangular prisms) of constant cross section and different heights were compacted at two different densities (6.8 and 7.0 g/cm 3 ) from a hybrid traditional diffusion-bonded powder and sintered at 1120°C, for 25 minutes, in industrial sinter-hardening equipment. During sintering and fast cooling periods, the temperature at the core of 25 mm height rectangular prism has been recorded. Through a mathematical approach, the heat transfer coefficients at the boundaries of the prism have been calculated from the experimental temperature values. Due to asymmetric flow during fast cooling in the sintering furnace, the boundary condition on the upper surface was considered to be different from the lateral and the lower surfaces. After specifying the boundary conditions, the direct problem has been formulated in order to calculate the temperature distribution as a function of time inside parallelepipeds characterized by different surface/volume ratios. These equations were solved using a commercial finite volumes numerical code. The results obtained show that the cooling rate depends on density: the higher the density, the lower the cooling rate, i.e. the influence of porosity on material hardenability is positive." @default.
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- W2184829300 date "2004-01-01" @default.
- W2184829300 modified "2023-09-26" @default.
- W2184829300 title "INFLUENCE OF DENSITY AND SURFACE/VOLUME RATIO ON THE COOLING RATE OF SINTER-HARDENING MATERIALS" @default.
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