オーステンパ球状黒鉛鋳鉄の高温引張変形特性

概要

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The tensile deformation behavior of austempered spheroidal graphite cast iron were investigated by varying test temperature (from 300 K to 873 K) and strain rate. The microstructure of the materials used in this study is upper bainitic structure, typically consisted of bainitic ferrite and retained austenite. But after holding or testing at elevated temperature, the retained austenite decreased rapidly from about 25 % at 300 K to almost 0 % at 770 K. Therefore, for understanding the tensile character of this material, the study were carried out by using tensile test, optical microscopy, scanning electron microscopy and X-ray diffraction analysis. The results reveal an inverse dependence on test temperature below 550K, and also on the strain rate at about 473 K are worthy to notice. Based on the experimental data, the dominant factors of above-mentioned phenomenon were clarified and discussed in this report.
Japan Foundry Engineering Societyの論文