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Microstructure Evolution and Mechanical Behaviour of SAW Weldments of CSEF Steel on Preheating and PWHT

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Abstract

In this study, double-sided submerged-arc-welded CSEF steel joints were considered for microstructural and mechanical (hardness, ductility and strength) characterisations for four different cases of preheating and PWHT processes. The XRD and EDS analyses were also performed to investigate the phase transformation and chemical composition. Preheating was observed to be an improving factor for ductility and hardness of the welds. Similarly, PWHT enhanced the uniformity in the hardness distribution owing to reduced austenitic grain size in the HAZ as well as equiaxed fine-grained ferrite matrix in the FZ. It was observed that preheating and combined preheating and PWHT increased the ductility of the weld by 16.9% and 56.3%, respectively, from the as-welded case. Furthermore, it was also observed that preheating individually and preheating combined with PWHT reduced the maximum hardness values by 8.2% and 60.2%, respectively.

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Authors and Affiliations

  1. Indian Institute of Technology Guwahati, Guwahati, India

    Saurav Suman, Pankaj Biswas & Avinish Tiwari

  2. National Institute of Technology Mizoram, Aizawl, India

    Saurav Suman

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  1. Saurav Suman
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  2. Pankaj Biswas
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Suman, S., Biswas, P. & Tiwari, A. Microstructure Evolution and Mechanical Behaviour of SAW Weldments of CSEF Steel on Preheating and PWHT. Trans Indian Inst Met 73, 1185–1197 (2020). https://doi.org/10.1007/s12666-020-01961-5

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