抄録
In order to clarify the quenching crack phenomenon in cast steel, a disk shaped low alloy cast steel specimen with an opening was quenched in polymer at 1123K. The behavior of quenching crack was checked by microstructure observation and analyzed by heat treatment simulation. Influence of the polymer density on the cooling process of low alloy cast steel materials was greatest in stages I and II of the cooling process. Transformation stress on martensite also has great influence, and qunching crack occurs less easily with decreasing martensite transformation rates. Heat treatment simulation clarified the causes and differences in mechanism for quenching crack. In addition, heat treatment simulation was also useful for predicting crack generation time and crack generation position in the specimen.
