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Mechanisms of Fatigue Endurance in Alloy 617M at Different Temperatures (300-1023 K)
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-18 , DOI: 10.1007/s11665-020-05013-3
Aritra Sarkar , Chanchal Ghosh , A. Nagesha , R. Mythili

The present study aims at understanding the mechanisms of fatigue endurance through high-cycle fatigue (HCF) behavior of Alloy 617M at varying temperatures, ranging from 300 to 1023 K. Dynamic strain aging (DSA) was a key feature observed in this alloy at high temperatures (853-973 K), which also affects the cyclic life as well as the endurance limit. Furthermore, in situ precipitation of Cr23C6 and γ′ phase (Ni3(Al,Ti)) at 973 K during the course of HCF cycling is found to impart a beneficial effect on the HCF life of the alloy. At T > 973 K, effect of creep damage was found to be prominent, resulting in a deteriorating effect on HCF life. The role of DSA, precipitation and creep on the fatigue damage is assessed through in-depth microstructural characterization of the tested specimens, which is further utilized to develop a damage map across the temperatures 300-1023 K.



中文翻译:

617M合金在不同温度(300-1023 K)下的疲劳耐力机理

本研究旨在了解合金617M在300至1023 K的不同温度下的高循环疲劳(HCF)行为的耐疲劳机制。动态应变时效(DSA)是该合金在高温下的主要特征。温度(853-973 K),这也会影响循环寿命以及耐久性极限。此外,发现在HCF循环过程中在973 K处Cr 23 C 6γ ′相(Ni 3(Al,Ti))的原位析出可对合金的HCF寿命产生有益的影响。在T > 973 K,发现蠕变损伤的影响显着,从而导致对HCF寿命的恶化。DSA,沉淀和蠕变对疲劳损伤的作用是通过对被测样品进行深入的微观结构表征来评估的,并进一步用于在300-1023 K的温度范围内绘制损伤图。

更新日期:2020-09-20
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