短时过热对DD6镍基单晶高温合金蠕变性能的影响  

Investigation on Effect of Short-term Overheating on Creep Properties of Nickel-based Single-crystal Superalloy DD6

作　　者：崔若尧 潘冬星 刘志成[1] 许文斌 程昊 章的 王晓钢[1] CUI Ruoyao;PAN Dongxing;LIU Zhicheng;XU Wenbin;CHENG Hao;ZHANG Di;WANG Xiaogang(State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle,College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Zhuzhou 412002,China)

机构地区：[1]湖南大学机械与运载工程学院汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《材料开发与应用》2024年第5期79-85,共7页Development and Application of Materials

基　　金：国家科技重大专项资助项目(Y2019-VIII-0007-0168);国家自然科学基金资助项目(52122505)。

摘　　要：多引擎旋翼机在飞行过程中可能遇到因单发失效(OEI)而造成其余发动机工作功率激增的情况,由此带来的短时过热效应可能影响航空发动机涡轮叶片的服役性能,尤其是涡轮叶片材料的蠕变性能。本研究聚焦于短时过热效应对常见镍基单晶高温合金DD6蠕变性能的影响,通过含有OEI阶段的非等温蠕变试验对短时过热效应进行评估,并对合金经过OEI处理后的微观组织进行表征和分析。研究结果表明:OEI引入的短时过热会导致合金在OEI作用阶段内的应变突增,并改变其随后的蠕变进程。短时过热会导致DD6合金中的主要强化相γ′相的体积分数显著降低,且其降低幅度与γ′相是否筏化具有紧密的相关性。A rotorcraft aircraft with multiple engines may encounter one engine inoperative(OEI)situation during flight,leading to a surge in the operating powers of the remaining aero-engines.This will cause the turbine blades to suffer short-term overheating,which may affect the service performance and creep life of the blade material.To understand the effect of short-term overheating on the creep property of the nickel-based single-crystal superalloy DD6,widely used in turbine blades,we conduct the non-isothermal creep test considering the OEI stage to study the influence of short-term overheating,and analyze the microstructure of the material after OEI treatment.The test results show that overheating will cause a sudden strain increase in the OEI term and change the subsequent creep process.The short-term overheating causes a significant decrease in the volume fraction of theγ'phase,and the decrease is closely related to whether theγ'phase becomes rafted.

关 键 词：DD6高温合金 短时过热 非等温蠕变 单发失效 蠕变性能 

分 类 号：TG132.32[一般工业技术—材料科学与工程]