Abstract: Nickel/nickel iron-based alloys are widely used in the manufacturing of hot end components for aircraft engines， gas turbines， advanced ultra-supercritical power plants， and other equipment due to their excellent oxidation resistance/corrosion resistance and high-temperature mechanical properties. Phosphorus （P） microalloying is one of the effective ways to improve their high-temperature creep strength and increase creep fracture life while maintaining the same main elements contents. P has extremely low solubility and low activity in nickel/nickel iron-based alloys. During solidification process， it is easy to accumulate at the front of the solid/liquid interface and is difficult to form compounds. By affecting the solidification and thermal deformation behavior， it changes the microstructural characteristics and thus affects the final mechanical properties. This article summarizes the distribution characteristics of phosphorus during the solidification process and its impact on solute segregation and solidification microstructure， the influence of solidification microstructure changes on subsequent thermal deformation behavior， the phosphorus segregation behavior during heat treatment and aging processes and its effect on microstructure， the influence mechanism of phosphorus segregation characteristics and microstructure changes on mechanical properties and deformation mechanisms. The results show that P tends to become enriched at the solid/liquid interface front during solidification， thereby promoting element segregation. After heat treatment， P segregates at grain boundaries or phase interfaces， optimizing the morphology of grain boundary precipitates and enhancing grain boundary strength. The influence of P on the hot deformation behavior arises from the dual effects of solute drag by phosphorus atoms and the promotion of recrystallization nucleation by MC carbides. The influence of P on the hor deformation behavior is related to the state of alloy. The appropriate P content can improve the creep rupture strength of alloys； however， this beneficial effect is constrained by both the alloy system and the magnitude of creep stress. Based on the results mentioned above， this paper established the influence mechanism of P in the entire process of casting， forging， and component performance. It also briefly introduces the current problems and further research directions.

Key words: Phosphorus； Nickel/nickel Iron-based Alloys； Solidification Behavior； Hot Deformation Behavior, Mechanical Properties

摘要： 镍/镍铁基合金以其优异的抗氧化/腐蚀和高温力学性能而被广泛用于制造航空发动机、燃气轮机、先进超超临界电站等装备的热端部件，磷（P）微合金化是主元素含量保持不变的前提下改善其高温蠕变强度，增加蠕变断裂寿命的有效途径之一。P在镍基合金中溶解度极低且活性低，凝固过程中易在固/液界面前沿富集且不易形成化合物，通过影响凝固和热变形行为改变组织特征并影响最终的力学性能。全文概述了P在凝固过程中的分布特征及其对溶质分凝和凝固组织的影响，凝固组织变化对后续热变形行为的影响，热处理态及时效过程中P偏聚行为及其对组织的作用规律，P偏聚特征和组织变化对力学性能及其变形机制的影响规律和作用机制。结果显示，凝固过程中P易在固/液界面前沿富集，并促进元素偏析；在热处理后，P易偏聚于晶界或相界面，优化晶界析出相形貌，提升晶界强度；P对合金热变形行为的影响来源于磷原子固溶拖曳及MC碳化物促进再结晶形核的双重影响，该影响在不同状态合金中的差异性作用导致P对热变形行为的影响与合金状态相关；适量的P能够提升合金的蠕变持久强度，但该有益作用受制于合金体系和蠕变应力值。基于上述结果，本文初步建立了P对全工艺流程和部件最终性能的影响规律和作用机制，并指出了目前研究中存在的问题及进一步的研究方向。

关键词: 磷, 镍/镍铁基合金, 凝固行为, 热变形行为, 力学性能