Abstract
Hot deformation behavior and microstructure evolution of Nb contained 316LN steel were investigated after isothermal compression experiment in the temperature range of 950 to 1200 °C and strain rate range of 0.01 to 1 s−1. The activation energy Q of deformation were calculated by the analysis of the true strain true stress curves, and the results show that the Q value varies between 309 KJ mol−1 and 672 KJ mol−1; the Q value decreases with increasing temperature, decreasing strain rate and decreasing strain. The microstructure evolution showed that dynamic recovery (DRV) is the main softening mechanism under deformation conditions with low temperature and high strain rate (Z value > 41.8), dynamic recrystallization (DRX) is the dominant softening mechanism when the temperature is high and strain rate is low (41.8 > Z value > 35.4). In addition, the critical condition for the initiation of dynamic recrystallization (DRX) was established, and this could provide guidance on the formulation of grain refinement process. Furthermore, the DRX mechanism was demonstrated by EBSD (electron backscattered diffraction) and TEM (transmission electron microscopy) analysis. It suggested that continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) are two main DRX mechanisms for Nb contained 316LN. The twin palys an improtant role in both kinds of DRX mechanisms.
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