Abstract
The precipitation behavior of carbides and the shifting tendency of the Ms temperatures in the three kinds of cold die steel (JIS SKD 1, SKD 11 and SKD 12) under various cooling conditions from austenitizing temperature has been investigated using a scanning electron microscope (SEM) and a dilatometer.As a result of the slower cooling from the austenitizing temperature, the reaction of carbide precipitation occurs at grain boundaries, and then, within the grain of the prior austenite. The Ms temperature in each kind of steel shifts toward the higher temperature side following a decrease in the cooling rate from the austenitizing temperature.In this study, the relationship between the precipitation of the carbides and Ms temperature in the cold die steel has been clarified and finally, the evaluation of hardenability due to carbide precipitation is discussed using these measured Ms temperature data as the index.
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