Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels |
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Authors: | Ran Wei Cheng-jia Shang Kai-ming Wu |
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Institution: | (1) Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;(2) Tubular Goods Research Center of CNPC, Xi’an, 710065, China |
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Abstract: | 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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Keywords: | |
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