Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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An Empirical Approach to Analyze Creep Rupture Behavior of P91 Steel

  • Aslam, Muhammad Junaid (Department of Metallurgical and Materials Engineering, Middle East Technical University) ;
  • Gur, Cemil Hakan (Department of Metallurgical and Materials Engineering, Middle East Technical University)
  • Received : 2021.03.11
  • Accepted : 2021.04.21
  • Published : 2021.05.27
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Abstract

P91 steel has been a highly researched material because of its applicability for high-temperature applications. Considerable efforts have been made to produce experimental creep data and develop models for creep life prediction. As creep tests are expensive and difficult to conduct, it is vital to develop authenticated empirical methods from experimental results that can be utilized for better understanding of creep behavior and can be incorporated into computational models for reliable prediction of creep life. In this research, a series of creep rupture tests are performed on the P91 specimens within a stress range of 155 MPa to 200 MPa and temperature range of 640 ℃ (913 K) to 675 ℃ (948 K). The microstructure, hardness, and fracture surfaces of the specimens are investigated. To analyze the results of the creep rupture tests at a macro level, a parameter called creep work density is derived. Then, the relationships between various creep parameters such as strain, strain rate, time to rupture, creep damage tolerance factor, and creep work density are investigated, and various empirical equations are obtained.

Keywords

Acknowledgement

This research work is conducted at Department of Metallurgical and Materials Engineering, METU, Ankara. The authors would like to thank Welding Technology and NDT Research/Application Center (METU, Ankara) officials, Dr. Koray Yurtisik and Murat Tolga Erturk for the arrangement of P91 material. Authors also extends acknowledgment for Dr. Onder Sahin and Huseyin Ceylan for their help in conducting creep rupture tests at Instron.

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