常温から700℃までの引張り応力下の鋳鉄の機械的性質

概要

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An investigation was conducted to clarify the stress-strain properties of gray cast iron at elevated temperatures up to 700°C under tensile stress. Hardness at elevated temperatures was also measured to examine the correlation between the stress-strain properties and the hardness of matrix. Elastic modulus of cast iron under tensile stress at both elevated temperature and room temperature decreased linearly as tensile stress increased. Hardness of cast iron decreased as temperature rose and this downward propensity of hardness was very different in different temperature ranges. In the range from room temperature to 100°C, hardness decreased to a certain degree, it decreased slightly in the range 100∼400°C, and then rapidly in the 400∼700°C. Hardness and elastic modulus at elevated temperatures showed similar tendencies according to the testing temperatures. They showed relatively little change at temperatures below 400°C, but decreased markedly above 400°C. Diagrams of total and permanent strain ε, εp and stress σ-strain ε of cast iron under tensile stress can be expressed well by the following empirical formulae. εp=βeασ, ε = (σ+E0βeασ-mβeασ·σ)⁄(E0-mσ) where α and β are constant, m and E0 are respectively the coefficient of Young's modulus at zero stress level of cast iron.
日本鋳造工学会の論文