镍基合金优良的耐高温、耐蚀、高强、高韧综合性能使其在多个领域广泛应用，但热加工及多因素交互作用环境下服役性能的控制与提升难题限制其发展。本项申请以Inconel625合金为对象，以稳定塑性成形温度区间与超临界环境下安全服役温度区间所表现出的温敏特性为切入点，重点研究热塑性屈服特性与高温疲劳失效特性的温度关联机制。通过中子原位衍射压缩、多温域热压缩及高温金相等实验研究热加工过程组织演变，验证镍基合金中发现的类似于钢铁强韧化机制的塑性诱导现象，揭示其特有的变形抗力大、成形温度区间窄及高温组织不稳定等与温度相关的热塑性特性；通过超临界应力腐蚀实验研究高温高压腐蚀环境下的服役行为，将力-化交互作用同合金固有的温敏特性建立关联，探明其在高温、腐蚀及应力等多因素交互作用下的组织与性能退化机制。通过温度驱动合金组织调控可实现双向优化，拓宽塑性成形温度窗口，同时精准控制并提升超临界环境下的安全服役寿命。

Nickel alloys were widely used in many fields for their excellent performance, such as high temperature resistance, corrosion resistance, high strength and toughness properties. However, the difficulties in controlling and enhancing in hot deforming technology and service performance in multiple factors interaction environment prevented its further development. In this work, based on the temperature-sensitive characteristics which were discovered in temperature range for plastic deformation and safe service in supercritical environment, Inconel 625 alloy was researched focusing on the so-called temperature mechanism between thermoplastic yield characteristics and high temperature fatigue failure characteristics. Based on in situ neutron diffraction compression test, multiple temperature range hot compress test and high temperature metallurgical test, microstructure evolution in hot deformation was investigated. Plasticity-induced phenomenon found in nickel-based alloy that similar to toughening mechanisms of steel was verified. Those special characteristics in deformation such as bigger deformation resistance, narrow temperature range for forming and microstructure instability in high temperature associated with temperature was revealed. Based on stress corrosion test and high temperature fatigue experiment, service behavior of alloy in supercritical environment was studied. Interaction between mechanic and chemistry was demonstrated in combination with the inherent temperature-sensitive properties of alloy, to explore the degradation mechanism of microstructure and properties attributed to interaction of many factors such as high temperature, corrosion and stress. Mutual optimization could be achieved by microstructure optimization under temperature driven. On the one hand, a steady forming temperature window could be expanded, on the other hand, safety of alloy service life in supercritical environment could be controlled precisely and enhanced significantly.