Comparison of fatigue crack growth rate of aged CrMo steel in superheated steam and air environments

Yoichi Takeda, Yuji Ozawa, Nur Farahanis Ismail, Susumu Nakano

Research output: Contribution to conferencePaper

Abstract

Owing to the large amount of installation of renewable energy sources, which introduce large output fluctuations, the load-following operation will be mandatory in fossil power plants including coal-fired power plants. In cases where the load-following operation becomes the main mode, it is assumed that the start/stop frequency and the output adjustment for a short period are increased, and therefore, it is thought that the fatigue damage becomes more distinct. In this study, to clarify the oxidation behavior and its correlation with the crack growth behavior in aged CrMo cast steel, crack growth tests were performed in dry air and in superheated steam at 600°C using the newly developed clip gauge which can be used in both these environments. Crack growth rates were examined using a compact tension specimen under cyclic loading and compared in terms of the J-integral range, ΔJ. The crack growth rate in the steam environment was slightly lower than that obtained in the air environment. Formation of voids was significant in the oxide formed in the crack propagated in the dry air environment. It was thought that the change in strength and adhesiveness of the oxide affects environmental fatigue crack growth in addition to its thickness.

Original languageEnglish
Pages1101-1105
Number of pages5
Publication statusPublished - 2020 Jan 1
Event7th International Conference on Power Engineering, ICOPE 2019 - Kunming, China
Duration: 2019 Oct 212019 Oct 25

Conference

Conference7th International Conference on Power Engineering, ICOPE 2019
CountryChina
CityKunming
Period19/10/2119/10/25

Keywords

  • Crack growth
  • Fatigue
  • Steam oxidation
  • Steam turbine

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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  • Cite this

    Takeda, Y., Ozawa, Y., Ismail, N. F., & Nakano, S. (2020). Comparison of fatigue crack growth rate of aged CrMo steel in superheated steam and air environments. 1101-1105. Paper presented at 7th International Conference on Power Engineering, ICOPE 2019, Kunming, China.