单、多轴混合加载下GH4169合金的高温疲劳特性  

FATIGUE CHARACTERISTICS FOR GH4169 SUPER-ALLOY UNDER UNIAXIAL/MULTIAXIAL LOADING AT HIGH TEMPERATURE

作　　者：尚德广[1] 陈建华[1] 孙国芹[1] 蔡能[1] 王建国[2] 王连庆[2] 

机构地区：[1]北京工业大学机电学院,北京100022 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《金属学报》2005年第8期785-790,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目10172010

摘　　要：利用拉扭薄壁管疲劳试样,在应变控制拉扭循环加载下对高温合金材料GH4169的多轴循环特性进行了实验研究.高温疲劳实验过程中,采用单、多轴混合加载路径对薄壁管疲劳试件进行加载,通过连续记录拉与扭的应力响应值研究了变幅高温多轴疲劳特性.结果表明,在高温低周单、多轴混合疲劳块载荷加载下,试件的疲劳寿命与应力响应特性不但取决于应变加载路径, 而且与加载路径的排列顺序和加载参数的大小有关.The multiaxial cyclic characteristic of the thin tubular specimen of superalloy GH4169 was investigated by the strain control under tensional-torsional loading at high temperature. The uniaxial and multiaxial loading paths were adopted in fatigue test. The multiaxial fatigue behavior was studied by the relationship between the cyclic stress response of tension/torsion and the number of cycles from recorded experimental data. The results showed that the fatigue life and the characteristics of cyclic hardening or softening not only depend on the strain loading paths, but also on the sequence of loading paths and the loading parameters.

关 键 词：高温合金GH4169 多轴低周疲劳 循环硬化与软化 比例加载 非比例加载 

分 类 号：TH114[机械工程—机械设计及理论] TG142.71[一般工业技术—材料科学与工程]