Abstract
AbstractThe feasibility of using high temperature stress relaxation to monitor the restoration process in hot deformed austenite has been studied. The stress relaxation technique was applied to determine the kinetics of softening in C–Mn and C–Mn–Nb steels, and the effects of temperature, axisymmetric compressive strain, strain rate, and reheating temperature are demonstrated and the results compared with the predicted values. In particular, the role of niobium in preventing recrystallisation is considered. The results show that the method is able to reveal the progress of static recrystallisation, and that the softening ratio at any given time can be predicted from the recorded relaxation curves. The effects of some particular experimental factors on the results are discussed, such as an applied stress during the softening and the longitudinal temperature gradient present in the specimens. The particular effectiveness of the technique for the investigation of fast restoration processes such as recovery a...
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