焼結鋼のヤング率・引張強さと気孔率の関係およびそれら物性値間の相関について

概要

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Young's modulus (E) and tensile strength (S) of sintered steels depend mainly on porosity (P). The relations of P to E and S are described as E=(E_0-E_)exp(-b_E・P)+E_ and S=(S_0-S_)exp(-b_s・P)+S_, respectively, where E_0 and S_0 mean the mechanical properties at P=0, E_, b_E, S_, and b_s are experimental constants. The E_ and b_E are affected by pore characteristic, such as pore shape, size, and interconnection, and S_0, S_, and b_s depend on not only the pore characteristic but also metal matrix structure. The fitting curves of shear modulus and 0.2% proof stress used by the above relation of P also correspond to the measured values of them, respectively. And then, Poisson's ratio calculated by the above relatons of Young's and shear moduli correspond to the measured value in comparison with Poisson's ratio calculated by the fitting equation, the type of E=E_0 exp(-b_E・P), of each modulus. Furthermore, the relationship between ln(S-S_) and ln(E-E_) of sintered steels shows the positive linear correlation.
社団法人日本機械学会の論文
2006-06-25