Article

Journal of Engineering Research

, 3:6

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Guodong GaoAffiliated withMarine Engineering College, Dalian Maritime UniversityNautical and Marine Engineering College, Dalian Ocean University Email author 
  • , Shulin DuanAffiliated withMarine Engineering College, Dalian Maritime University
  • , Wenxiao ZhangAffiliated withMechanical Engineering College, Dalian Ocean University

Abstract

The high temperature low cycle fatigue tests of DZ22 superalloy and K403 superalloy are carried out under strain controlled. The low cycle fatigue test data of DZ22 superalloy at 850°C and K403 superalloy at 750°C are processed by Coffin-Manson method. When experimental data is processed, negative or small plastic strain values often appear and the results of life prediction fail to meet the needs of the designer. In order to solve the problem, a new method based on stress fatigue and Coffin-Manson method is developed, the results of life prediction are given by using new method at the 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 superalloy proves more effective than K403 superalloy.

Keywords

High temperature life prediction low cycle fatigue stress superalloy