重型燃气轮机涡轮叶片用定向柱晶/单晶高温合金应用现状

Application status of directionally solidified/single crystal superalloys for heavy-duty gas turbine blades

摘要

重型燃气轮机（HDGT）高温涡轮叶片的设计寿命通常达到数万小时，其服役环境呈现高应力、长时热暴露及高盐/高硫等复杂介质诱发的热腐蚀耦合特征。本文系统综述了 HDGT 用定向柱晶（DS）与单晶（SC）镍基高温合金的研究现状与发展趋势。首先，明确了工业燃机“高温前级高性能化、低温后级经济化”的分级用材策略，指出其核心设计逻辑已由追求瞬时极限强度转向保障长期组织稳定性。其次，重点探讨了合金成分设计的演变，分析了以降低 Re 含量、优化 W/Mo 配比及提高 Cr 含量为特征的“低 Re 设计哲学”，旨在抑制长期服役中拓扑密排（TCP）相的析出并提升环境适应性。随后，针对 HDGT 叶片尺寸巨大的特点，梳理了大尺寸叶片制备中由尺度效应引发的热-溶质-应力多场协同失稳问题，以及枝晶偏析对服役性能的“组织继承效应”。最后，阐述了长寿命服役下蠕变、疲劳与环境损伤的多机制耦合演化规律，并重点展望了修复延寿技术在全寿命管理中的工程应用，指出其未来发展的核心：在不破坏原有单晶或定向晶体结构完整性的前提下，实现大尺寸叶片表层防护体系的重建与内部退化组织的高效恢复。突破大尺寸复杂结构叶片的铸造良率瓶颈、提升极端工况下的抗热腐蚀能力是当前面临的核心挑战。未来研究应聚焦于力学-环境性能的协同优化及基于物理机理的寿命预测模型，以支撑下一代高参数燃机的研制。

Abstract

The design life of turbine blades in heavy-duty gas turbines (HDGT) typically reaches tens of thousands of hours， operating under conditions characterized by high stress，prolonged thermal exposure and coupled hot corrosion induced by complex media such as high salt and high sulfur. This paper systematically reviews the current research status and development trends of directionally solidified columnar (DS) and single crystal (SC) nickel-based superalloys for HDGT applications. Firstly， the graded material allocation strategy of “ high performance for high-temperature front stages and cost-effectiveness for low-temperature rear stages” is clarified，noting that the core design logic has shifted from seeking instantaneous ultimate strength to ensuring long-term microstructural stability. Secondly， the evolution of alloy compositional design is emphasized， analyzing the “ low-Re design philosophy” characterized by reduced Re content， optimized W/Mo ratios and increased Cr levels to suppress the precipitation of topologically close-packed (TCP) phases and enhance environmental resistance. Furthermore， considering the massive scale of HDGT blades， the challenges in manufacturing large-scale components are discussed， specifically the thermal-solute-stress multi-field synergistic instability induced by scale effects and the “ microstructure inheritance effect” of dendritic segregation on service performance. Finally， this review elucidates the multi-mechanism coupled evolution of creep， fatigue and environmental damage under long-term service conditions，and highlights the prospective engineering applications of repair and life-extension technologies in life-cycle management. It emphasizes that the core of future development lies in reconstructing the surface protection systems of large-scale blades and efficiently restoring the degraded internal microstructures，without compromising the structural integrity of the original single crystal or directionally solidified substrates. It is pointed out that breaking through the bottleneck of casting yield for large-scale complex blades and improving hot corrosion resistance under extreme environments are the core challenges currently faced. Future research should focus on the synergistic optimization of mechanical-environmental performance and physics-based life prediction models to support the development of next-generation high-parameter gas turbines.

关键词

重型燃气轮机 / 定向凝固高温合金 / 单晶高温合金 / 成分设计 / 失效机制

Key words

heavy-duty gas turbine / directionally solidified superalloy / single crystal superalloy / compositional design / failure mechanism

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