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High-Temperature Fatigue Crack Growth Behaviour of SS 316LN

  • M. Nani Babu
  • G. Sasikala
  • Shaju K. Albert
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

FCG behaviour of SS 316LN steel is evaluated in the temperature range 300–823 K. While there is a general increase in FCG rate with temperature and load ratio, specifically at low applied stress intensity factor ranges, for intermediate temperatures (623–723 K) and applied stress intensity factors (15–25 MPa m1/2), a cross over in the crack growth rate is observed. The Paris exponents for different temperatures varied between 2.4 and 3.7. The variations in the crack growth rates are examined by considering the crack closure and dynamic strain ageing (DSA) effects. Attempts have been made to rationalize these variations with the temperature dependence of Young’s modulus and yield strength. The stress intensity factor range normalized with yield strength gives a better correlation with FCG rates at different temperatures. The unified data for all the temperatures was fitted to a Paris-type correlation, viz., \( \frac{{{\text{d}}a}}{{{\text{d}}N}} = C \cdot \left( {\frac{\Delta K}{{\sigma_{\text{ys}} }}} \right)^{m} \) with C = 4.5 nm/cycle and m = 2.73.

Keywords

High-temperature fatigue crack growth Load ratio Dynamic strain ageing 

Notes

Acknowledgements

The authors would like to acknowledge Mr. Syed Kaleem and Ms. Shanthi for experimental support. Also authors wish to acknowledge Dr. A.K. Bhaduri, Director, IGCAR, for continuous support and encouragement.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Materials Technology Division, Metallurgy and Materials GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia

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