-1）的動(dòng)態(tài)再結(jié)晶行為。通過(guò)光學(xué)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(duì)合金熱變形過(guò)程中組織演變和動(dòng)態(tài)再結(jié)晶（DRX）形核機(jī)制的影響。結(jié)果表明，根據(jù)加工硬化率曲線能夠準(zhǔn)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?jǐn)?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(dòng)態(tài)再結(jié)晶（DDRX）和連續(xù)動(dòng)態(tài)再結(jié)晶（CDRX）形核機(jī)制同時(shí)發(fā)生。隨著變形溫度的升高，CDRX形核機(jī)制減弱，而CDRX機(jī)制在高溫條件下占據(jù)主導(dǎo)。隨著應(yīng)變量的增加，合金中DDRX機(jī)制逐漸變強(qiáng)。熱變形后期，CDRX僅作為輔助形核機(jī)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."/>