Abstract
The hot compressive deformation behavior of 20CrMnTiH steel was studied using a Gleeble-3500 thermomechanical simulator at temperatures ranging from 600 °C to 650 °C at a strain rate of 5 s−1 and in a strain range of 30% to 70%. The effects of the ausforming temperature, strain rate and strain on the martensite microstructure were studied. The results show that in the absence of recrystallization, when the strain rate is large, the deformation temperature of the supercooled austenite is lowered, the deformation amount is increased, the martensite structure is refined, and the microhardness is increased. The deformation of supercooled austenite can create nanostructured lath martensite with high microhardness.
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