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Enhancement of Properties of Micro-alloyed Low-Carbon Ni-Added Steel by Thermomechanical Treatment

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Abstract

The concurrent use of micro-alloying additions and thermomechanical treatment is a common practice for obtaining high-quality grades of forged steels. Judicious use of chemistry, heat treatment schedule, and controlled processing can lead to a wide range of microstructure and thus final properties suitable for the production of different parts for the automobile industry. In this paper, thermomechanical treatment of Ni-added micro-alloyed steel containing Nb, V, Ti has been carried out with different deformation schedules (50-70%) at high temperatures followed by the varying cooling rate (i.e., forced air cooling, oil quenching, and water quenching). The cooling rates for three conditions were measured as 5 °C/s for forced air cooling, 40 °C/s for oil quenched, and 110 °C/s for water quenched samples. Thermomechanical and post-tempering treatment cycles were employed for the steel with 1150 and 900 °C as upper and lower forging temperatures. The best combination of properties viz; YS: 1044 MPa, UTS: 1308 MPa, % El: 16.7, %RA: 57 and Impact Toughness: 50 J/cm2 could be achieved for 70% deformed samples, followed by forced air cooling. The reasons have been attributed to the segregation of Ti & Nb carbides at grain boundaries as revealed by microstructural analysis. This has led to restriction of grain boundary coarsening at high temperatures. Further, fine vanadium carbide and the presence of retained austenite have contributed to improving the elongation and toughness values.

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Authors and Affiliations

  1. Materials and Metallurgical Engineering Department, National Institute of Foundry and Forge Technology, Ranchi, 834003, India

    D. Roy, A. K. Gupta & B. K. Jha

  2. R&D Centre for Iron and Steel, SAIL, Ranchi, 834002, India

    Md. S. Alam & S. Srikanth

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  1. D. Roy
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Roy, D., Gupta, A.K., Alam, M.S. et al. Enhancement of Properties of Micro-alloyed Low-Carbon Ni-Added Steel by Thermomechanical Treatment. J. of Materi Eng and Perform 29, 7952–7963 (2020). https://doi.org/10.1007/s11665-020-05311-w

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  • DOI: https://doi.org/10.1007/s11665-020-05311-w

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