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首页> 外文期刊>International Journal of Fatigue >Influence of work-hardening on fatigue crack growth, effective threshold and crack opening behavior in the nickel-based superalloy Inconel 718
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Influence of work-hardening on fatigue crack growth, effective threshold and crack opening behavior in the nickel-based superalloy Inconel 718

机译：加工硬化对镍基高温合金Inconel 718中疲劳裂纹扩展，有效阈值和开裂行为的影响

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摘要

In this study, the influence of rotary swaging induced cold work on long fatigue crack growth, threshold and opening behavior in the nickel-based superalloy Inconel 718 was investigated. Ambient temperature experiments were carried out using arc-shaped tension specimens according to ASTM standard E399. The direct current potential drop (DCPD) method was used for crack length measurements and crack opening force evaluation. Fatigue crack growth rates (FCGR) measured at load ratios of R = 0.2, R = 0.5 and R = 0.7 were found to increase due to work-hardening in continuous (increasing Delta K) and load shedding (decreasing Delta K) tests. Effective fatigue crack growth thresholds (Delta K-th,K-eff) were determined according to the K-max= const. procedure and found to decrease monotonically with increasing degree of work-hardening. Compared to the non-deformed material, crack opening stress intensities K-op were reduced in work-hardened states at three different crack lengths. To quantify the detrimental effects of cold work, the effective stress intensity factor range (Delta K-eff) model was applied. SEM and TEM micrographs were taken to complement the study.
机译：在这项研究中，研究了旋转锻造冷加工对镍基高温合金Inconel 718中长疲劳裂纹扩展，阈值和开孔行为的影响。根据ASTM标准E399，使用弧形拉伸试样进行环境温度实验。直流电势降（DCPD）方法用于裂纹长度测量和裂纹张开力评估。发现在载荷比R = 0.2，R = 0.5和R = 0.7时测得的疲劳裂纹扩展率（FCGR）由于在连续（增量Delta K）和负荷减少（增量Delta K）测试中的加工硬化而增加。根据K-max = const确定有效的疲劳裂纹扩展阈值（Delta K-th，K-eff）。并发现随着加工硬化程度的增加单调减少。与未变形的材料相比，在三种不同的裂纹长度下，加工硬化状态下的裂纹开口应力强度K-op降低了。为了量化冷作的有害影响，使用了有效应力强度因子范围（Delta K-eff）模型。拍摄了SEM和TEM显微照片以补充研究。

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