一种镍基高温合金的低周疲劳性能  

Low cycle fatigue behavior of a new nickel-base superalloy

作　　者：杨功显[1,2] 徐永锋[2] 江雷[2] 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：《材料热处理学报》2012年第8期45-52,共8页Transactions of Materials and Heat Treatment

摘　　要：研究了一种镍基高温合金在不同温度下的低周疲劳性能,分析了疲劳断口。结果表明,该合金循环应力响应行为表现出对温度和外加总应变幅很强的依赖关系,不同的循环应力响应行为可归因于位错、强化相和合金元素间复杂的交互作用。合金疲劳寿命与温度、外加总应变幅、氧化损伤程度有关。疲劳断裂行为受外加应变幅和氧化影响很大。Cyclic deformation response and low cycle fatigue behavior a nickel-base superalloy at different temperatures were investigated. The results show that the alloy exhibits cyclic hardening, softening or stability, which depends on the testing temperature and total strain amplitude. The cyclic stress response behavior carl be rationalized based on the mechanisms associated with interactions between dislocations, strengthening phases and solute atoms. The fatigue life is closely relative to the temperature, the total strain amplitude, the degree of oxidation damage. The external strain amplitude and oxidation have a great influence on the fatigue fracture behavior.

关 键 词：镍基高温合金 高温低周疲劳 循环应力响应 裂纹萌生和扩展 

分 类 号：TG146.1[一般工业技术—材料科学与工程]