【摘 要】
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The microstrueturai features and grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength micro,alloyed steels were i
【机 构】
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International Research Institute for Steel Technology,School of Materials Science and Engineering
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The microstrueturai features and grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength micro,alloyed steels were investigated using optical microscopy,scanning electron microscopy,and electron back,scattering diffraction.The coarse-grained region of the heat-affected zone consists of predominantly bainite and a small proportion of acieular 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 baekseattering 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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