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Influence of Heat Input on Microstructure and Toughness Properties in Simulated CGHAZ of X80 Steel Manufactured Using High-Temperature Processing

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Abstract

To determine and demonstrate the weldability of high-Nb high-temperature processed (HTP) steels and provide extremely valuable information for future line pipe steel design and general steel manufacture, in the current study the toughness in simulated coarse-grained heat-affected zone (CGHAZ) of an X80 grade steel manufactured using HTP was evaluated. The simulated CGHAZs subjected to thermal cycles with various heat inputs (HIs) (0.8 to 5.0 kJ/mm) were produced using a Gleeble 3500 simulator. The microstructures and corresponding mechanical properties were investigated by means of optical microscopy, scanning electron microscopy, electron backscatter diffraction, hardness testing, and Charpy V-notch (CVN) testing. The microstructural examination shows that the simulated CGHAZs consisted of a bainite-dominant microstructure and relatively low amount (<2 pct) of martensite–austenite (M–A) constituent. The prior austenite grain size was controlled to be 45 to 55 µm at HIs of 0.8 to 3.5 kJ/mm, and remarkably increased to 85 µm at an HI of 5 kJ/mm. The results of CVN testing suggest that superior toughness can be achieved in the studied range of HIs (0.8 to 5 kJ/mm). This is thought to be associated with the combined effects of bainitic microstructure and low M–A fraction as well as comparatively fine austenite grain size in the studied CGHAZs.

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Acknowledgments

The authors wish to thank Microalloyed Steel Institute (USA) for providing the materials to conduct this study. The authors also acknowledge the use of facilities within the UOW Electron Microscopy Centre.

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Authors and Affiliations

  1. School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia

    Zhixiong Zhu (Associate Research Fellow), Jian Han (Associate Research Fellow) & Huijun Li (Professor)

  2. Faculty of Engineering and Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia

    Jian Han (Associate Research Fellow)

Authors
  1. Zhixiong Zhu
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  2. Jian Han
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  3. Huijun Li
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Correspondence to Jian Han.

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Manuscript submitted May 13, 2015.

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Zhu, Z., Han, J. & Li, H. Influence of Heat Input on Microstructure and Toughness Properties in Simulated CGHAZ of X80 Steel Manufactured Using High-Temperature Processing. Metall Mater Trans A 46, 5467–5475 (2015). https://doi.org/10.1007/s11661-015-3122-y

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