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Mechanisms of Fatigue Endurance in Alloy 617M at Different Temperatures (300-1023 K)

机译:不同温度下合金617m的疲劳耐久性机制(300-1023 k)

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摘要

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 Cr(23)C(6)and gamma ' phase (Ni-3(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. AtT > 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.
机译:本研究旨在了解通过在不同温度下通过高周期疲劳(HCF)行为的疲劳耐久性(HCF)行为,范围为300至1023k.Nymity菌株老化(DSA)是在该合金中观察到的关键特征 温度(853-973 k),也影响循环寿命以及耐久极限。 此外,在HCF循环过程中,在973K期间,在973k时,在973k的γ相(Ni-3(Al,Ti))的原位沉淀被发现赋予了对HCF寿命的有益作用 合金。 att> 973 k,发现蠕变损坏的效果突出,导致对HCF寿命的影响恶化。 通过对测试样品的深度微观结构进行评估DSA,降水和蠕变对疲劳损伤的作用,其进一步用于在温度300-1023 K上产生损伤图。

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