Abstract
Based on microstructure desired, ductile iron casting balls are treated by a multi-cycle quenching-partitioning-tempering (MQ-P-T) process, and such a complex process is performed by alternating water quenching and air cooling. The resultant microstructure is characterized and the effect of the heat treatments on the mechanical properties is evaluated. Compared to ductile iron casting iron samples, the hardness of MQ-P-T ductile iron balls has been significantly enhanced. After treated by MQ-P-T process, the impact performance of sample 1# reduces, while the impact performance of 2# and 3# increases. With the purpose of studying the root causes of the mechanical performance enhancement, this paper will further investigate the strengthening and toughening mechanism of MQ-P-T ductile iron casting balls by means of microscopic characterization technique, such as OM and XRD methods.
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