Effects of simulated on line accelerated cooling processing on transformation temperatures and microstructure in microalloyed steels Part 2—Plate processing |
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| Authors: | E V Pereloma J D Boyd |
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| Affiliation: | 1. Department of Materials and Metallurgical Engineering, Queen's University, Kingston, Ontario, Canada.;2. Dr Pereloma is now in the Department of Materials Engineering, Monash University, Clayton, Victoria, Australia. |
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| Abstract: | The effects of three on line accelerated cooling parameters (accelerated cooling start temperature TA, cooling rate ?, and cooling interrupt temperature T1) on transformation temperatures and microstructure in a low carbon microalloyed plate steel were studied by laboratory simulations in a quench deformation dilatometer. Varying the on line accelerated cooling parameters changes the austenite condition and transformation path. In general, the transformation path shifts from polygonal ferrite towards bainite with increasing TA, increasing ?, and decreasing T1. There is also a corresponding refinement in the microstructure and increase in hardness. In comparison with the laboratory thermomechanical processing treatments, the multipass industrial rolling schedule produces a much more heavily deformed austenite structure than laboratory thermomechanical processing treatments, which would favour high transformation temperatures, fine polygonal ferrite microstructure, and lower hardness.MST/3425 |
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