Microstructure and Properties of Vanadium-bearing DP980 Steels Processed with Continuous Galvanizing Line Simulations
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摘要: 利用连续镀锌模拟设备,研究了微合金化元素Nb、V和V-N加入到低碳高强(980级)双相钢后组织与性能的变化。在基本成分基础上,设计了不同含量的V或Nb、采用高N或正常N含量的钢,经过不同的热浸镀锌(GI)、合金化镀锌(GA)和超快冷处理。此外,还利用石英管炉对模拟镀锌后的钢板进行热处理。结果表明,马氏体—贝氏体—铁素体各相比例受到不同微合金化元素加入量的强烈影响,但是各相强度影响较小。在小于0.1%C~1.75%Mn钢中实测抗拉强度达到1 100 MPa、同时具有良好的塑性和加工硬化性能。Abstract: A study is being conducted of additions of the microalloying elements Nb,V and V-N to a low carbon,high-strength （980 grade） Dual-Phase steel that was processed using a CGL simulation. In this study,compositions with a common base but containing various additions of V or Nb with or without high N were designed and subjected to Gleeble simulations of different galvanizing （GI）,galvannealing （GA） and super cooling processing. These experiments were supplemented with additional heat treatments performed using a quartz filament furnace. The results revealed that the phase balance （martensite-bainite-ferrite）was strongly influenced by the different microalloying additions,while the strengths of each phase were somewhat less affected. UTS levels of 1 100 MPa,along with good levels of ductility and work hardening,were measured in steels containing less than 0.1% C and 1.75% Mn. The results of this program will be presented and discussed.
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