Effect of finish rolling temperature on the continuous cooling transformation of V-alloyed high strength hull steel
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摘要: 利用热模拟实验机模拟了中板控制轧制工业生产工艺,测定了一种钒微合金化船体结构钢经不同温度多道次变形后的动态CCT曲线,讨论了终轧温度和冷却速度对组织、γ/α相变及CCT曲线的影响.结果表明:随终轧温度的降低,实验钢的动态CCT曲线整体向左上方移动,获得铁素体+珠光体组织的冷却速度范围变宽;随冷却速度的增加,γ/α相变开始温度Ar3逐渐降低,贝氏体相变开始温度Bs以抛物线形式变化;铁素体晶粒随终轧温度降低或冷速的增加而细化.Abstract: The dynamic continuous cooling transformation (CCT) diagrams of a kind of V-alloyed high strength hull steel were determined by the use of a thermo-simulating machine after multi-pass deformation designed to simulate the industrial controlled rolling procedures for the production of plates at different temperatures. The effects of finish rolling temperature and cooling rate on the microstructure, γ/α transformation and CCT diagrams of the hull steel were investigated. The results show that the dynamic CCT diagrams shift to left and upper, and the region of cooling rate to obtain ferrite and pearlite is widened with decreasing finish rolling temperature. With the increase of cooling rate, the onset of γ transformation (Ar3) is lowered gradually, and the bainite start temperature Bs changes in a parabolic way. As the finish rolling temperature decreases or the cooling rate increases, the grains of ferrite are refined.
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