Comparison of the very high cycle fatigue behaviors of INCONEL 718 with different loading frequencies

查看全文 作　　者：ZHANG [1]YangYang;DUAN [1]Zheng;SHI [1]HuiJi

机构地区：[1]Key Laboratory of Applied Mechanics,Tsinghua University,Chinese Ministry of Education

出　　处：《Science China Chemistry》索引2013年第56卷第3期,共7页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10872105 and 51071094) 摘　　要：In order to clarify the differences of very high cycle fatigue(VHCF) behavior of nickel based superalloy IN718 with different loading frequencies,stress-controlled fatigue tests were carried out by using ultrasonic testing method(20 KHz) and rotary bending testing method(52.5 Hz),both at room temperatures,to establish stress versus cycles to failure(S-N) relationships.Results disclosed that cycles to failure at a given stress level increased with an increase of the applied frequency,i.e.,the higher frequency produced an upper shift of the S-N curves.Fractographic analysis suggested that crack initiation and propagation behaviors had large differences:cracks in low-frequency tests preferentially initiated from multiple sources on the specimen surface,while in high-frequency tests,cracks mostly originated from a unique source of subsurface inclusions.Subsequently,frequency-involved modeling was proposed,based on the damage accumulation theory,which could well illustrate qualitatively those comparisons due to different loading frequencies. 关键词：加载频率疲劳行为 INCONEL 超声波探伤方法镍基高温合金压力控制裂纹萌生频率测试

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Comparison of the very high cycle fatigue behaviors of INCONEL 718 with different loading frequencies

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