长期时效对燃气轮机叶片用镍基高温合金微观组织的影响  

The Effect of Long-Term Thermal Exposure on the Microstructure of A Directionally Solidified Nickel-Base Superalloy

作　　者：杨功显[1,2] 徐永锋[2] 江雷[2] 邹军涛[1] 梁淑华[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]东方汽轮机有限公司材料研究中心,四川德阳618000

出　　处：《西安理工大学学报》2012年第4期453-458,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51174161);陕西省科技统筹创新计划基金资助项目(2012KPCQ01-14);陕西省电工材料与熔渗技术重点实验室基金;陕西省重点学科建设资金资助项目

摘　　要：研究了燃气轮机叶片用镍基高温合金在800℃、850℃和900℃下分别长期时效1 000 h、3 000 h和5 000 h后的组织。结果表明,γ'沉淀相生长动力学遵循LSW熟化理论,长期时效过程中一次碳化物MC主要退化为M23C6型碳化物,且未发现有害相TCP相,表明合金具有良好的热稳定性。Microstructural evolution of a nicle-base directionally solidified superalloy during long-term thermal exposure at 800℃,850℃ and 900℃ for 1000 h,3000 h and 5000 h is investigated in this research.The results obtained from the growth kinetics of γ′ precipitates in this superalloy are presented.It has been found that the overall kinetic of coarsening follows a linear trend in this system,as predicted by Lifshitz,Slyozov and Wagner（LSW） theory.The carbide product of primary MC degeneration in this alloy is mainly M23C6.The TCP phases are not found during thermal exposure,which confirms this alloy has a good thermal stability.

关 键 词：镍基高温合金 长期时效 γ'沉淀相 碳化物 

分 类 号：TG113.12[金属学及工艺—物理冶金]