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Fatigue resistance of a hot corrosion exposed disk superalloy at varied test temperatures

机译：暴露于热腐蚀的盘式高温合金在不同测试温度下的抗疲劳性

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摘要

The fatigue resistance of the hot corrosion pitted ME3 disk superalloy was investigated. Low cycle fatigue specimens were subjected to hot corrosion exposures that produced pits on the gage sections. These specimens were tested at varied temperatures and strain ranges. Corrosion pitting influenced fatigue life and failure mode by varying degrees, depending on temperature and strain range. As observed through interrupted tests, fatigue cracks initiated at a smaller fraction of life for high-temperature tests, in comparison to that at low temperatures. Correspondingly, the crack initiation failure mode changed significantly with test temperature. While cracks initiated from the hot corrosion pits for all test conditions, at 704 degrees C the intergranular initiation failure mode was dominant, whereas at the lower temperatures cracks initiated within the pits from crystallographic facets. Finite element analyses were performed to quantify the effect of varying pit dimensions and spacing on elastic stress concentration. The highest stress concentration was calculated to occur at the narrow ligaments between overlapping hot corrosion pits. Increasing the number of overlapping pits did not further add to the stress concentration. There was good qualitative agreement between the calculated stress concentrations and the location of crack initiations for tests conducted at 704 degrees C but not for tests conducted at 204 degrees C.
机译：研究了热腐蚀点蚀的ME3盘式高温合金的抗疲劳性。低周疲劳样品经受热腐蚀暴露，从而在量具截面上产生凹坑。这些样品在不同的温度和应变范围内进行了测试。腐蚀点蚀根据温度和应变范围不同程度地影响疲劳寿命和失效模式。从中断的测试中可以看出，与低温测试相比，高温测试的疲劳裂纹寿命较短。相应地，裂纹萌生失效模式随测试温度的变化而显着变化。尽管在所有测试条件下均从热腐蚀坑中产生裂纹，但在704摄氏度时，晶间萌生破坏模式占主导，而在较低温度下，裂纹中的裂纹是从晶体学方面产生的。进行了有限元分析，以量化变化的凹坑尺寸和间距对弹性应力集中的影响。计算出最高应力集中发生在重叠的热腐蚀坑之间的窄韧带上。重叠凹坑数量的增加并没有进一步增加应力集中。对于在704摄氏度进行的测试，但对于在204摄氏度进行的测试，计算得出的应力集中与裂纹萌生位置之间存在良好的定性一致性。

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