Effect of Vanadium on the Precipitation Behavior and Aging Properties of Higher Yield Strength Weathering Steels
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摘要: 结合攀枝花现有的资源特点,针对性地进行含V高强度耐候钢研究。采用热模拟试验、相分析、拉伸试验等方法,研究了不同工艺条件下钒氮微合金化高强耐候钢的V析出行为及时效性能。研究表明:随N含量的增加,不同温度卷取的试验钢中V的析出比例明显高于对比钢,增N后V析出量明显增加,并且在冷却过程中V析出趋势增加;随V/N值的升高,AI值降低,当V/N低于3.5时对时效性能不利。通过研究,确定了450 MPa级高强度耐候钢关键控制参数,考虑晶粒细化和沉淀强化的综合作用,试验钢的最佳卷取温度为650℃;考虑到N对时效指数的影响,钒氮微合金化高强耐候钢中的V/N值控制略高于V与N理想化学配位数(3.64),试验钢的综合性能较佳。Abstract: The target-oriented researches on the Vanadium-containing weathering steels were conducted in this paper.Methods such as thermal simulation test,precipitate phase quantitative analysis,tensile test and so on were used to investigate the vanadium precipitation behavior and aging properties of higher yield strength weathering steels with different process condition.It has been found that with increasing N content the vanadium precipitation ratio in tested steels is significantly higher than that in referred steel.Increasing N content leads to a large V precipitation amount and V precipitation potential during cooling process.AI value is decreased when the V/N ratio increased,but the V/N ratio is less than 3.5 against aging performance.The critical technological parameters of 450 MPa grade higher yield strength weathering steel was confirmed,and the optimal coiling temperature of tested steel was 650 ℃,which corresponds to the combined effect of grain refinement and precipitation strengthening.Considering the effect of nitrogen on aging performance,the ratio of V/N in V&N microalloying high strength weathering steel should be controlled to be a little higher than the ideal V/N chemical coordination ratio value(3.64)to achieve the best comprehensive properties.
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Key words:
- high strength weathering steel /
- microalloying /
- vanadium /
- nitrogen /
- precipitate phase /
- aging index
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