The Effect of Quench Rate on the Properties and Morphology of Ferrous Martensite.
RENSSELAER POLYTECHNIC INST TROY N Y SCHOOL OF ENGINEERING
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The effect of high quench rate on the M sub s temperature, percent transformed, martensite morphology and austenite hardness has been studied for several Fe-Ni-C steels. For these steels the quench rate was varied only in the austenite region. The M sub s temperature was found to increase with increased quench rate for both high and low carbon steels while the percent transformation increased or decreased depending upon the morphology of the steel. Parallel aligned plate structures were observed which resemble a twinned lath morphology. It was demonstrated that the actual difference between this morphology and a true lath structure. The morphology changes were compared to the measured changes in martensite properties in order to identify the mechanism of the morphology shift. It was concluded that for these alloys the morphology was controlled by the austenite shear mode.
- Properties of Metals and Alloys