Fatigue and fracture behavior of nickel-based superalloy Inconel 718 up to the very high cycle regime

作     者：Xian-feng MA Zheng DUAN Hui-ji SHI Ryosuke MURAI Eiichi YANAGISAWA 

作者机构：Applied Mechanics Laboratory Department of Engineering Mechanics School of Aerospace Tsinghua University Beijing 100084 China Mitsubishi Heavy Industries Ltd. Tokyo Japan 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2010年第11卷第10期

页      面：727-737页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China (Nos 10872105 and 51071094) the Mitsubishi Heavy Industries, Ltd, Japan 

主　　题：Nickel-based superalloy High cycle fatigue (HCF) Fatigue crack initiation Crack growth Life prediction 

摘      要：The fatigue and fracture behavior of nickel-based superalloy Inconel 718 was investigated up to the very high cycle regime under rotary bending tests at room temperature. It was found that this superalloy can still fracture after exceeding 107 cycles. Fractographic analysis revealed that there was a transition from fatigue crack initiation at multi-sites to single initiation with decreasing stress levels. The fracture surface can be divided into four areas according to the appearance, associated with fracture mechanics analysis of the corresponding stress intensity factors. The fracture mechanism dominant in each area was disclosed by scanning electron microscope examination and analyzed in comparison with those obtained from the crack growth tests. Subsequently, life prediction modeling was proposed by estimating the crack initiation and propagation stage respectively. It was found that Chan (2003) s model for initiation life and the Paris law for growth life can provide comparable predictions against the experimental life.