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Comparative analysis of continuous cooling transformation behaviour in CGHAZ of API X-80 and X-65 line pipe steels

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Abstract

Continuous cooling transformation diagrams were obtained for a simulated coarse-grain heat-affected zone of API X-80 and X-65 steels using Gleeble-3800 thermo-mechanical simulator. Dilatometry results showed that variable cooling rates have significant effect on phase transformation behaviour and microstructure of the steels. For X-80 steel, a mixture of bainite/martensite at fast and medium cooling rates and ferrite/pearlite at slow cooling rates was obtained and confirmed by microhardness measurements between 340 and 240 HV, whereas, for X-65 steel soft phase such as ferrite was nucleated along with bainite at moderate (15–100 °C s−1) and pearlite at slow cooling rates (3–10 °C s−1). Dilatometry curve comprises inherent noise, and Loess computational filter was used to filter background noise in the curves. Martensite/bainite and ferrite/pearlite coexisted for most cooling rates, which made it difficult to distinguish transformation kinetics of individual phases. In the first derivative analysis d/dT {(ΔL/Lo)} of dilatometry curves, peaks of individual phases were clearly observed. Peaks of individual phase were separated according to their transformation temperature range, and peak rate temperatures were determined. It was confirmed that the first derivative d/dT {(ΔL/Lo)} analysis described phase transformation behaviour precisely and aided in identification of the transformed phases.

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Acknowledgements

The authors are grateful to the NIT Jalandhar, Tata Steel Limited, Jamshedpur, and CSIR-NML Jamshedpur for providing facilities and support to carry out this work.

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Authors and Affiliations

  1. Dr. B. R. Ambedkar National Institute of Technology Jalandhar, Jalandhar, India

    Mayur Pratap Singh & Dinesh Shukla

  2. R&D, Tata Steel Limited, Jamshedpur, 831001, India

    Kanwer Singh Arora, Nikhil Shajan, Sangeetha Ranga Pandu & Mahadev Shome

  3. CSIR-National Metallurgical Laboratory, Jamshedpur, India

    Rajneesh Kumar

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  1. Mayur Pratap Singh
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  3. Nikhil Shajan
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Correspondence to Kanwer Singh Arora.

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Singh, M.P., Arora, K.S., Shajan, N. et al. Comparative analysis of continuous cooling transformation behaviour in CGHAZ of API X-80 and X-65 line pipe steels. J Therm Anal Calorim 137, 1155–1167 (2019). https://doi.org/10.1007/s10973-019-08023-z

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  • DOI: https://doi.org/10.1007/s10973-019-08023-z

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