Poisson's Ratio of Sintered Materials for Structural Machine Parts (特集自動車に関連する粉体および粉末冶金技術)

概要

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The relationships between Youngs modulus, shear modulus and Poissons ratio of sintered materials and porosity were investigated for use as practical P/M machine parts. Three types of steel powders were prepared and then compacted, sintered, and heat-treated under various conditions. Porosity had the greatest influence on Youngs modulus, shear modulus, and Poissons ratio. Especially, Poissons ratio was affected by the pore shape, which depended on the type of powder, sintering temperature and atmosphere, and heat treatment. For the more practical use of powder compositions, there was little influence by the sintering atmosphere on the Poissons ratio of the sintered and heat-treated materials. For a partially alloyed powder (Fe-4mass%Ni-1.5 mass% Cu-0.5 mass%Mo)+0.8mass%C powder, Poissons ratio versus porosity depended only on the sintering temperature at a porosity below 20%. In this case, a simpler approximate equation of Poissons ratio of the sintered and heat-treated specimen versus porosity was proposed as follows: ν=0.300-0.266P+0.579P2 at 1423 K (sintering temperature) or ν=0.304-0.264P+0.548P2 at 1523K
社団法人粉体粉末冶金協会の論文
2004-07-15