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Welding Characteristics of Ultrahigh Strength Steel in Annealed and Quench-Tempered Conditions

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Abstract

In this research, the welding characteristics of a new UHSLA steel, 35NiCrMoV123, have been studied in two general conditions (annealed and quench-tempered). Carbon equivalent value of 35NiCrMoV123 steel is near 0.9 which classifies it as a “very difficult to weld” steel. The effects of welding heat treatment cycle (preheat, interpass, and postheat) on metallurgical and mechanical properties of weldments have been investigated by tensile, impact toughness, and hardness tests, as well as optical microscopy observations. It has been observed that by employing high-temperature stress relief (600 °C), welding could be performed in annealed condition successfully. Also, the results indicate that by applying precise welding heat treating cycle (preheat, interpass, and postheat temperature at 310 °C) in order to obtain lower bainitic microstructure in HAZ, also employing high-temperature stress relief (600 °C), welding in quench-tempered condition could be successfully performed.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11369466, Tehran, Iran

    A. Roshanghias, M. Barzegari, A. H. Kokabi & H. R. Madaah Hosseini

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  1. A. Roshanghias
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  2. M. Barzegari
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  3. A. H. Kokabi
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  4. H. R. Madaah Hosseini
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Correspondence to A. Roshanghias.

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Roshanghias, A., Barzegari, M., Kokabi, A.H. et al. Welding Characteristics of Ultrahigh Strength Steel in Annealed and Quench-Tempered Conditions. J. of Materi Eng and Perform 19, 963–969 (2010). https://doi.org/10.1007/s11665-009-9586-4

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  • DOI: https://doi.org/10.1007/s11665-009-9586-4

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