-1）的動態(tài)再結(jié)晶行為。通過光學顯微鏡（OM）、掃描電子顯微鏡（SEM）和電子背散射衍射儀（EBSD）研究變形溫度和應(yīng)變量對合金熱變形過程中組織演變和動態(tài)再結(jié)晶（DRX）形核機制的影響。結(jié)果表明，根據(jù)加工硬化率曲線能夠準確確定DRX出現(xiàn)的臨界應(yīng)力和臨界應(yīng)變。合金的DRX晶粒體積分數(shù)隨變形溫度和應(yīng)變量的增加而增加。在高溫低應(yīng)變速率下，不連續(xù)動態(tài)再結(jié)晶（DDRX）和連續(xù)動態(tài)再結(jié)晶（CDRX）形核機制同時發(fā)生。隨著變形溫度的升高，CDRX形核機制減弱，而CDRX機制在高溫條件下占據(jù)主導。隨著應(yīng)變量的增加，合金中DDRX機制逐漸變強。熱變形后期，CDRX僅作為輔助形核機制發(fā)揮作用。另外，Σ3孿晶界的形成有助于DRX晶粒的形核。;The dynamic recrystallization behavior of a novel Ni-based superalloy was investigated by means of isothermal compression tests in the temperature range of 1040?1120 °C, and the strain range of 0.35?1.2 with a strain rate of 0.1 s-1. The microstructure evolution and nucleation mechanism of dynamic recrystallization (DRX) were investigated by optical microscope (OM), scanning electrical microscope (SEM), and electron backscattered diffraction (EBSD). Results show that the critical stress and strain for the initiation of DRX are determined from the work hardening rate curves. The volume fraction of DRX grains increases with increasing the temperature and strain. Both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) coexist at low deformation temperature and low strain. The effect of CDRX becomes weaker with increasing the deformation temperature, and DDRX is the dominant nucleation mechanisms of DRX at higher temperatures. With increasing strain, the effect of DDRX becomes stronger, and CDRX can only be considered as an assistant nucleation mechanism of DRX at the latter stage of deformation for the studied superalloy. Additionally, Σ3 twin boundary contributes to the nucleation of DRX grains."/>