Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650℃
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第8期
论文作者：Xumin Zhu Congyang Gong Yun-Fei Jia Runzi Wang Chengcheng Zhang Yao Fu Shan-Tung Tu Xian-Cheng Zhang
文章页码：1607 - 1617
摘 要：GH4169 at 650℃ in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size.
Xumin Zhu1，Congyang Gong1,2，Yun-Fei Jia1，Runzi Wang1，Chengcheng Zhang2，Yao Fu1，Shan-Tung Tu1，Xian-Cheng Zhang1,2
1. Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology2. AECC Commercial Aircraft Engine Co.LTD,Shanghai Engineering Research Center for Commercial Aircraft Engine
摘 要：GH4169 at 650℃ in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size.
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