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Investigation on Fracture Behavior of Grade 91 Steel at 300-550 °C

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Abstract

The fracture toughness (J1c) of modified 9Cr-1Mo (P91 or Grade 91) steel was evaluated in the temperature range 300-550 °C. The yield strength and ultimate tensile strength values were observed to decrease with test temperatures. The ductility (% uniform elongation and post-necking elongation) was minimum in the temperature range 350-400 °C. From J–R curves established at 300, 350, 400, 450, 500, and 550 °C, fracture toughness (J1c) and tearing modulus were determined at different loading rates of 0.01, 0.05 and 0.1 mm/s. For all the loading rates, J1c values decreased in the temperature range 300-450 °C, followed by an increase in fracture toughness up to 550 °C. These trends in tensile and fracture properties can be attributed to the influence of dynamic strain aging.

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Authors and Affiliations

  1. Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    B. Shashank Dutt, M. Nani Babu, G. Shanthi, A. Moitra & G. Sasikala

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  1. B. Shashank Dutt
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  2. M. Nani Babu
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  3. G. Shanthi
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  4. A. Moitra
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Correspondence to B. Shashank Dutt.

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Shashank Dutt, B., Nani Babu, M., Shanthi, G. et al. Investigation on Fracture Behavior of Grade 91 Steel at 300-550 °C. J. of Materi Eng and Perform 27, 6577–6584 (2018). https://doi.org/10.1007/s11665-018-3718-7

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  • DOI: https://doi.org/10.1007/s11665-018-3718-7

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