2004•Gangtie yanjiu xuebaoRequires access
Continuous Cooling Transformation of Niobium Microalloyed High Carbon Steels
Xiang Li
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Abstract
The transformation of deformed niobium-microalloyed high carbon steel and plain high carbon steel during continuous cooling process were simulated on Gleeble-1500 thermomechanical simulator, and the microstructure evolution of these steels were analyzed and compared. The experimental results compared with plain showed that the niobium-microalloyed high carbon steel has high carbon steel higher transformation temperature and wider temperature range of dual-phase region (A+P), which is more than 100 ℃ at different controlled cooling rate. Cooled down at the same rate as plain high carbon steel, in the microstructure of niobium-microalloyed high carbon steel there is much more proeutectoid ferrite, with much finer grain size, and the pearlite interlamellar spacing is thinner when the cooling rate is higher than 10 ℃/s. In addition, the bainite is occurred when cooling rate is higher than 30 ℃/s.