The Effects of Austempering Heat Treatment Process Parameters on the Transformation Kinetics of Austenite to Bainite in AISI 52100 Steel Public
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A series of experiments were conducted to determine the isothermal kinetics of the austenite to bainite transformation in 52100 steel at 230 and 240 oC. The steel was austenitized at 850 oC for 30 minutes and quenched in liquid salt. The percent Bainite was determined using a linearized relationship with HRC data, and qualitative data for the microstructure was determined using x-ray diffraction (XRD). It was found that the bainitic transformation started and finished earlier at 240 oC. The HRC data indicated a complete transformation at about 40 minutes for both 230 and 240 oC trials, but XRD for both showed retained austenite after these points. XRD data indicates no retained austenite after 80 minutes, implying a complete transformation at 80 minutes rather than at 40 minutes.
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