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Ye X.,China Three Gorges University | Ye X.,Xiangyang Heavy Equipment Material Co. | Liu S.,Xiangyang Heavy Equipment Material Co. | Chen S.,Xiangyang Heavy Equipment Material Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Heat treatment process of H13 steel after forging was tested. The results show that, treated with conventional spheroidizing annealing, the microstructure of the steel is coarse, microsegregation is serious, spheroidization is not complete, and most of the carbide is network. After high temperature normalizing+spheroidizing annealing, the microstructure is refined, the segregation of alloying elements and spheroidization rate of the carbides is improved, and the carbide is more evenly distributed in the ferritic matrix. When normalized at 1020°C, the segregation and network carbide structure is basically eliminated, and the spheroidization rate is up to 95%. Source


Liu S.,Xiangyang Heavy Equipment Material Co. | Ye X.,Xiangyang Heavy Equipment Material Co. | Ye X.,China Three Gorges University | Chen S.,Xiangyang Heavy Equipment Material Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Microstructure of the forged SKT4 die steel after conventional annealing and hydrogen diffusion annealing was coarse pearlite and blocky ferrite, and the micro-segregation was serious. The efficiency of the conventional annealing process on the final results was low. The optimized heat treatment process for the SKT4 die steel is normalizing and tempering. After the optimal heat treatment, the microstructure of the SKT4 die steel is fine ferrite and pearlite, and it can be significantly fined by the optimal process. The optimal process can reduce heat treatment cycle, improve the efficiency, and fining the microstructure but can eliminate the hydrogen brittleness. Source

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