Microcracking in High Temperature Low Cycle Fatigue
At elevated temperatures, fatigue deformation and fracture are influenced by synergistic actions of several time dependent damage mechanisms. These include dynamic strain ageing, oxidation, creep and phase transformations. Studied are the influence of dislocation density, precipitates, strain rate, temperature and hold time on the high temperature low cycle fatigue behaviour of austenitic and ferritic steels and their weld joints and a Nimonic PE16 superalloy. Cycling hardening and softening response in various alloys would be discussed in terms of accompanying substructural changes.
KeywordsFatigue Life Weld Metal Strain Amplitude Dynamic Strain Ageing Cyclic Stress Response
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