Abstract
The thermal parameters of 3Cr2Mo plastic die steel were tested, and a two-dimensional finite element model was established in this paper. The temperature fields of 3Cr2Mo plastic die steel with the thickness 120 mm were calculated and analysed under three different quenching processes. The results showed that for the third process, the cooling velocity was faster when the temperature was >500°C, which was not in the bainite and martensite transformation zone. In addition, the fast cooling rate effectively avoided the pearlite appearance. When the temperature was <500°C, the cooling velocity under the third cooing process was slower, which alleviated the big transformation stress. The hardness and the microstructures were tested after the third cooling process and tempering. The microstructures after tempering were all tempered sorbite, and the tempering hardness difference was ≤3 HRC. The study provided references for 3Cr2Mo large plastic die steel online prehardening process formulation and optimisation.
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