Microstructure and Property of Vanadium Micro-alloyed Cold Rolling Dual Phase Steel
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摘要: 实验室模拟研究了热轧卷取温度及退火温度对钒微合金化双相钢组织性能的影响规律,比较了热轧态显微组织和退火后双相钢组织与力学性能的关系,分析了双相钢的强化机理。结果表明:当热轧采用900℃终轧、650℃卷取工艺,连退采用800℃退火、270℃过时效时,获得的综合性能最好。具体为:屈服强度为437 MPa,抗拉强度为815 MPa,伸长率为21.0%,n值为0.1912,退火组织中铁素体平均晶粒为11.5级,马氏体含量约为38%。通过热轧及退火工艺对组织、性能的影响规律探索,优化了生产工艺。Abstract: The effect of coiling temperature after hot rolling and annealing temperature on the microstructure and properties of vanadium micro-alloy cold-rolled dual phase steels was studied in laboratory.Microstructure and property were compared between the as-hot rolled and after annealing strip,strength mechanism of microstructure with dual phase was also analyzed.The results showed that the best mechanical properties is obtained when the hot rolling uses a final rolling temperature of 900 ℃,a coiling temperature of 650 ℃,and continuous annealing uses an annealing temperature of 800 ℃ and an overaging temperature of 270 ℃.The results are as follows:the yield strength of the steel is 437 MPa,tensile strength is 815 MPa,elongation is 21.0%,n value is 0.191 2.The mean grain size of annealed sample is 11.5 grade,volume fraction of martensite is about 38%.Explore the influence of hot rolling and continue annealing process on the microstructure and properties,the production process were optimized.
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Key words:
- dual phase steel /
- vanadium /
- micro-alloy /
- coiling temperature /
- continuous annealing
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