Thermomechanical processing of M-50 steel.
Larson, Keith Robert Jr.
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Thermomechanical processing of AISI M-50 bearing steel was accomplished by an initial austenitize and quench followed by reheating and warm-rolling to a true strain of 2.0. Warm-rolling was successfully conducted at 650, 700, or 750°C. The effect of austenitizing temperature on grain size and residual carbides was evaluated following austenitizing at temperatures from 1090 to 1250°C. Grain growth was noted with increasing austenitizing temperature, especially for temperatures above 1150°C. Evaluation of the effect of warm-rolling on both carbide refinement and composition was performed using scanning electron microscopy. Comparison of as-received M-50 and the warm-rolled product were made. Temper carbides, those precipitated during the warm-rolling process, are refined by the processing. Residual carbides, those not dissolved in the initial austenitizing treatment, were only slightly refined in the rolling process. Stress-strain testing was conducted on both as-received and warm rolled materials and the increased strength observed were correlated with refined carbide and grain structures resulting from the warm-rolling.
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