Evaluation of Small Fatigue Crack Growth Rates in HIP FGH96 Superalloy Under Microstructural Influences

被引:0
|
作者
Yan, Rui-Guo [1 ]
Zhu, Li-Na [1 ,2 ]
Liu, An [1 ]
Wang, Xi-Shu [1 ]
机构
[1] Tsinghua Univ, Dept Engn Mech, Beijing, Peoples R China
[2] Tsinghua Univ, Tianjin Res Inst Adv Equipment, Wheel Rail Ctr, Tianjin, Peoples R China
基金
中国国家自然科学基金;
关键词
crack growth rate; crack propagation mechanism; powder metallurgy; SEM in situ technology; small fatigue crack; NICKEL-BASED SUPERALLOYS; LIFE PREDICTION; MODE FRACTURE; BEHAVIOR; PROPAGATION; INCLUSIONS; THRESHOLD; STATE;
D O I
10.1111/ffe.14620
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The effects of different evaluation methods and microstructural characteristics on the surface small fatigue crack growth rate of HIP FGH96 superalloy were quantitatively investigated using SEM in situ and other testing technologies. The results indicate that the effect of projected length a(1) and physical length a(2) on the small fatigue crack growth rate can be ignored, even if there are some deflection angles in small crack growth path. However, clear distinctions emerge when evaluating the small fatigue crack growth rate near the crack growth threshold under mixed-mode (Mode I/II) conditions, where the influence is quantitatively assessed using the maximum tangential stress criterion. Furthermore, differences between various evaluation methods of small fatigue crack growth rates and several important damage tolerance design parameters, such as Delta K-th, a(eq), or sigma(w), were quantitatively predicted based on Weibull distribution analysis.
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页数:11
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