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Strength of Materials

, Volume 14, Issue 6, pp 729–733 | Cite as

Effect of temperature on features and micromechanisms of fatigue crack growth in boiler steels

  • V. V. Pokrovskii
  • P. V. Yasnii
  • V. A. Stepanenko
  • Yu. S. Skorenko
Scientific-Technical Section
  • 25 Downloads

Conclusions

  1. 1.

    An increase in test temperature above room temperature leads to a decrease in crack growth rate in steels 15Kh2NMFA and 15Kh2MFA on the low-amplitude section of the fatigue curve and an increase in this rate in steel 15Kh2NMFA on the medium-amplitude section.

     
  2. 2.

    Intergranular fracture is active as a fracture micromechanism at room and low test temperatures and crack growth rates greater than 10−6 mm/cycle. The contribution of the intergranular mechanism to fatigue crack formation in the steels at room temperature is greatest (up to 40% of the total area of the fracture surface) on the medium-amplitude section of the curve, at values of Kmax ≈ 20 MPa·√m.

     
  3. 3.

    An increase in test temperature from 273 to 673 and 623°K, respectively, for steels 15Kh2NMFA and 15Kh2MFA leads to disappearance of intergranular fracture due to a reduction in the grain-boundary strength of the steels and to an increase in the SIF at which secondary microcracks appear.

     

Keywords

Growth Rate Fatigue Fracture Surface Fatigue Crack Test Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • V. V. Pokrovskii
    • 1
  • P. V. Yasnii
    • 1
  • V. A. Stepanenko
    • 1
  • Yu. S. Skorenko
    • 1
  1. 1.Institute of Strength ProblemsAcademy of Sciences of the Ukrainian SSRKiev

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