球状黒鉛鋳鉄の高温における引張強さと硬さの関係

概要

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Static tension tests at room temperature to 500°C and Vickers hardness tests at room temperature to 700°C were performed on the as-cast and heat-treated materials of spheroidal graphite cast iron. The regression equation that could estimate the tensile strength from Vickers hardness at elevated-temperatures was calculated and investigated. The main results obtained are summarized as follows.The tensile strength at an elevated-temperature decreased with increasing temperature for both the as-cast and heat-treated materials. Vickers hardness decreased with increasing temperature, which was the same as the tensile strength, and it decreased more rapidly when the temperature was above 600°C. However, the effects of normalizing and austempering heat-treatment on the tensile strength and hardness were remarkably noticed. A straight line relationship was established between tensile strength (σB) and hardness (HV) for various materials in the temperature range from room to 500°C, and the tensile strength was calculated by the following regression equation.The regression equation of σB and HV; σB(MPa)=2.80+2.586HV(kgf/mm2)
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