Rolling contract fatigue testing of Thermomechanically processed M-50 steel
Butterfield, Fred A., III
McNelley, Terry R.
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The influence on rolling contact fatigue behavior of thermomechanical processing (TMP) to refine grain and soluble carbide size was studied in this work on VIM-VAR M-50 steel. Material was processed ( austenit ized and warmrolled) following the procedures developed by Larson, with subsequent austenit izat ion times and temperatures (for final hardening) based on Bres ' data. Rolling contact fatigue testing indicates virtual equivalence of the as-received ( spheroidize-annealed) and TMP specimens evaluated, with the TMP material clearly no better than the as-received condition in terms of fatigue life. This is believed to be the result of one or both of the following: (a) austenitizat ion (hardening) of TMP material at too long a holding time, with a microstructural equalization occurring between conditions; and (b) voids existing at the ends of the insoluble carbides in both as-received and TMP material, which act as possible sites for crack initiation in the matrix.
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