Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime.
Influence of Heat Treatment on Cyclic Response of Nickel-Based Superalloy Inconel 718 up to Very-High Cycle Regime.
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DOI：
10.3390/ma13235358
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发表时间：
2020-11-26
期刊：
影响因子：
--
通讯作者：
Chen W
中科院分区：
文献类型：
--
作者：
Zhao M;Zhao Z;Liu L;Luo G;Chen W
循环响应和疲劳行为对热处理引起的材料微观结构敏感。本文对三种不同热处理的高温合金Inconel 718进行了比较，即退火、时效和直接时效高质量（DAHQ）。使用光学相机和扫描电子显微镜研究晶粒尺寸分布、相和析出物等的差异。时效热处理后屈服强度和极限强度明显提高。 20 kHz 下的自热现象随着晶粒尺寸的减小而减弱。存在从循环硬化到软化的转变。使用超声波疲劳装置测试了 Inconel 718 的极高循环疲劳 (VHCF) 行为。裂纹萌生持续时间占总疲劳寿命的99%以上。结论是平均晶粒尺寸影响VHCF强度和裂纹萌生机制，而自热现象并不是Inconel 718 VHCF强度的决定性因素。
Cyclic response and fatigue behavior are sensitive to the microstructure of material induced by heat treatment. In this paper, three sets of high-temperature superalloy Inconel 718 with different heat treatment, namely annealed, aged, and directly aged high quality (DAHQ), are compared. Difference in grain size distribution, phase, and precipitate, etc., were investigated using an optical camera and scanning electron microscopy. Yield and ultimate strength were found to increase obviously after aging heat treatment. Self-heating phenomenon at 20 kHz was attenuated as grain size decreased. There was a transition from cyclic hardening to softening. Very-high cycle fatigue (VHCF) behavior of Inconel 718 was tested using an ultrasonic fatigue device. Crack initiation duration occupied greater than 99% of the total fatigue life. It concluded that average grain size influences VHCF strength and crack initiation mechanism, and that self-heating phenomenon is not a decisive factor on VHCF strength for Inconel 718.
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