The high wearing resistance of the samples after hydrocooling and air cooling was partially attributed to martensite transformation and work-hardening.
Programmed cooling method: The glycerol and Dimethylsulfoxide, as cryoprotective agents, were mixed with COC1 cells suspensions at different concentration, respectively.
Through utilizing controlled cooling technique on large section bearing steel bar after rolling ,an ideal initiation structure sorbide can be attained.