Relations of Porosity to Young's Modulus and Tensile Strength and Correlations between Those Mechanical Properties of Sintered Steels

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  • 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
  • ショウケツコウ ノ ヤングリツ ヒッパリ ツヨサ ト キコウリツ ノ カンケイ オヨビ ソレラ ブッセイチ カン ノ ソウカン ニ ツイテ

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Abstract

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= (E0-Esub) exp (-bE·P) +Esub and S= (S0-Ssub) exp (-bs·P) +Ssub, respectively, where E0 and S0 mean the mechanical properties at P=0, Esub, bE, Ssub, and bs are experimental constants. The Esub and bE are affected by pore characteristic, such as pore shape, size, and interconnection, and S0, Ssub, and bs 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=E0 exp (-bE·P), of each modulus. Furthermore, the relationship between ln (S-Ssub) and ln (E-Esub) of sintered steels shows the positive linear correlation.

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