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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。
The changes of microstructure and properties of micro-alloying elements Nb, V and V-N after adding low-carbon and high-strength (980 grade) dual-phase steel were studied by continuous galvanizing simulation equipment. Based on the basic composition, different contents of V or Nb were designed, and the steel with high N or normal N content was subjected to different hot-dip galvanizing (GI), alloyed galvanized (GA) and ultra-fast cooling. In addition, the simulated galvanized steel sheet was heat-treated with a quartz tube furnace. The results show that the proportion of martensite-bainite-ferrite phase is strongly influenced by the amount of micro-alloying elements added, but the strength of each phase is less affected. In less than 0.1% C ~ 1.75% Mn steel measured tensile strength of 1 100 MPa, at the same time has good plasticity and work hardening properties.