Ran Wei, Cheng-jia Shang,  and Kai-ming Wu, Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels, Int. J. Miner. Metall. Mater., 17(2010), No. 6, pp. 737-741. https://doi.org/10.1007/s12613-010-0382-9
Cite this article as:
Ran Wei, Cheng-jia Shang,  and Kai-ming Wu, Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels, Int. J. Miner. Metall. Mater., 17(2010), No. 6, pp. 737-741. https://doi.org/10.1007/s12613-010-0382-9

Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels

+ Author Affiliations
  • Corresponding author:

    Kai-ming Wu    E-mail: wukaiming@wust.edu.cn

  • Received: 5 January 2010Revised: 25 January 2010Accepted: 6 February 2010
  • The microstructural features and grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels were investigated using optical microscopy, scanning electron microscopy, and electron backscattering diffraction. The coarse-grained region of the heat-affected zone consists of predominantly bainite and a small proportion of acicular ferrite. Bainite packets are separated by high angle boundaries. Acicular ferrite laths or plates in the coarse-grained region of the heat-affected zone formed prior to bainite packets partition austenite grains into many smaller and separate areas, resulting in fine-grained mixed microstructures. Electron backscattering diffraction analysis indicates that the average crystallographic grain size of the coarse-grained region of the heat-affected zone reaches 6–9 μm, much smaller than that of austenite grains.
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