Abstract
Abstract The alloyed steels with superior hardenability was proposed instead of the conventional HY-TUF steel for manufacturing of the large components. The CCT diagrams of the steels under consideration were plotted using the dilatometer experiments with the constant cooling rates 0,1…30 °C/s. Only martensite and bainite transformation were observed during the continuous cooling. The optimal partitioning temperature was determined using the calculation algorithm and the experimental QP heat treatment was performed. The presence of 11…15% of the retained austenite in the microstructure of the steels was detected after the QP treatment.
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