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Fatigue Crack Growth Behaviour of Conventional and Modified IN 718 Superalloys at 650 °C

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Abstract

In the present investigation, the fatigue crack growth behaviour of modified IN 718 superalloy (Ni-0.02 %, C-19.04 %, Cr-19.31 %, Fe-3.04 %, Mo-4.73 %, Nb-1.01 %, Al-1.16 %, Ti-0.0033 %, B, all in wt%) has been compared with conventional IN 718 superalloy (Ni-0.02 %, C-19.0 %, Cr-19.35 %, Fe-3.0 %, Mo-5.10 %, Nb-0.50 %, Al-1.00 %, Ti-0.0033 %, B, all in wt%) at 650 °C. Modified IN 718 superalloy exhibits marginally lower crack growth rate as compared to conventional alloy and was attributed to roughness induced crack closure.

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Acknowledgments

The authors are grateful to Defence Research and Development Organization for providing the funding and facilities to carry out this work.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, India

    E. Hari Krishna, Kartik Prasad & Vikas Kumar

  2. Department of Metallurgical Engineering, I.T-B.H.U, Varanasi, India

    Vakil Singh

Authors
  1. E. Hari Krishna
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  2. Kartik Prasad
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  3. Vakil Singh
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  4. Vikas Kumar
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Correspondence to Kartik Prasad.

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Hari Krishna, E., Prasad, K., Singh, V. et al. Fatigue Crack Growth Behaviour of Conventional and Modified IN 718 Superalloys at 650 °C. Trans Indian Inst Met 66, 1–4 (2013). https://doi.org/10.1007/s12666-012-0160-7

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  • DOI: https://doi.org/10.1007/s12666-012-0160-7

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