A study of high temperature low cycle fatigue life prediction for two superalloys

guodong gao, shulin Duan, Wenxiao Zhang

Abstract


The high temperature low cycle fatigue tests of DZ22 superalloy and K403 superalloyare carried out under strain controlled. The low cycle fatigue test data of DZ22superalloy at 850℃ and K403 superalloy at 750℃ are processed by Coffin-Mansonmethod. When experimental data is processed, negative or small plastic strain valuesoften appear and the results of life prediction fail to meet the needs of the designer. Inorder to solve the problem, a new method based on stress fatigue and Coffin-Mansonmethod is developed, the results of life prediction are given by using new method atthe same time. The results showed that new method is more accurate than the Coffin-Manson method. The life prediction capability of two methods for DZ22 superalloyproves more effective than K403 superalloy.

Keywords


High temperature; life prediction; low cycle fatigue; stress; superalloy

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References


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