Thermomechanical treatment as an effective method has been carried out in order to obtain a better combination of high strength and excellent toughness. In this work, the hot deformation behavior of 86CrMoV7 steel has been studied, and then the process of ausforging has been designed. The microstructures and mechanical properties of 86CrMoV7 steel by (1) direct quenching after forging (ausforging) and tempering, (2) quenching-and-tempering and spheroidizing annealing have been investigated. The results show ausforging-and-tempering provides high strength but same toughness as classical quenchingand-tempering.
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