Establishment of Continuous Cooling Transformation Curve and Microstructure Transformation for Rare Earth Alloyed High Carbon Wear Resistant Steel
The transformation structure and critical points of phase transformation for rare earth alloyed high carbon wear resistant steel as well as continuous cooling transformation(CCT)curve of undercooled austenite at different cooling rates are studied by metalloscope,field emission scanning electron microscopy and quenching dilatometer.The results showed that the critical points of phase transformation were Ac1=742.6℃,Ac3=816.5℃and Ms=307.0℃.When cooling rate is less than 0.4℃/s,the microstructure is a small amount of ferrite+pearlite;when cooling rate is 0.4℃/s,the microstructure is single-phase pseudo eutectoid pearlite;when cooling rate is greater than 0.5℃/s,the microstruc-ture is gradually transformed to martensite;when cooling rate is greater than 4℃/s,there is only the microstructure of martensite+retained austenite in the steel.
rare earth alloyed high carbon wear resistant steelCCT curvemicrostructure transformation
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