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A Critical Grain Size Concept to Predict the Impact Transition Temperature of Ti-Microalloyed Steels

  • Letters in Fracture and Micromechanics
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Abstract

Based on the assumption that local principal stress remains the same everywhere within a ferrite grain, a critical value of grain size can be determined for a fixed TiN particle size. When the grain size is smaller than the critical size, grain boundary is expected to resist the propagation of a micro-crack that is initiated from a TiN particle. Using this concept, an attempt has been made to predict the local cleavage fracture stress and 27J impact transition temperature (ITT) of different Ti-microalloyed steels, which were subjected to (instrumented) Charpy impact testing.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology (I.I.T.), Kharagpur, 721 302, India

    A. Ray & D. Chakrabarti

  2. Material Science Technology Division, National Metallurgical Laboratory (CSIR-NML), Jamshedpur, 831 007, India

    S. Sivaprasad

Authors
  1. A. Ray
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  2. S. Sivaprasad
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  3. D. Chakrabarti
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Correspondence to A. Ray.

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Ray, A., Sivaprasad, S. & Chakrabarti, D. A Critical Grain Size Concept to Predict the Impact Transition Temperature of Ti-Microalloyed Steels. Int J Fract 173, 215–222 (2012). https://doi.org/10.1007/s10704-012-9676-4

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  • DOI: https://doi.org/10.1007/s10704-012-9676-4

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