OBSERVATIONS ON THE INTERACTION OF HIGH MEAN STRESS AND TYPE II HOT CORROSION ON THE FATIGUE BEHAVIOR OF A NICKEL BASE SUPERALLOY.

被引：0

作者：

Allen, J.M. ^{[1
]}

Whitlow, G.A. ^{[1
]}

机构：

[1] Westinghouse Combustion Turbine, Systems Div, Concordville, PA, USA, Westinghouse Combustion Turbine Systems Div, Concordville, PA, USA

来源：

Journal of Engineering for Gas Turbines and Power | 1985年 / 107卷 / 01期

关键词：

CORROSION - High Temperature Effects - GAS TURBINES - Components - SUPERALLOYS - Stress Corrosion Cracking - TURBOMACHINERY - Blades;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A study measuring the effects of a molten sulfate/chloride salt on the creep/fatigue behavior of a nickel base turbine blade superalloy, Udimet 720, at 1300 degree F (704 degree C) is described. Cyclic stress-cycles to failure (S-N) curves were generated at high mean stress levels, with mean stress, maximum stress, or the ratio of minimum to maximum stress (R ratio) held constant. In salt, it was found that when maximum stress is above the yield, with the cyclic component 20 percent of the maximum, failure occurs by stress corrosion fatigue in orders of magnitude less time than for corresponding loading conditions in air. It is significant, from a failure analysis point of view, that fatigue fracture is intergranular in these circumstances.

引用

页码：220 / 224