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首页> 外文期刊>ISIJ international >Tensile Properties of Simulated Thin Slab Cast and Direct Rolled Low-carbon Microalloyed with Nb, V and Ti
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Tensile Properties of Simulated Thin Slab Cast and Direct Rolled Low-carbon Microalloyed with Nb, V and Ti

机译：Nb，V和Ti的模拟薄板坯铸造和直接轧制低碳微合金的拉伸性能

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摘要

The hot direct rolling of thin slab cast microalloyed, low-carbon steels was simulated on a laboratory scale. The carbon content of the steels ranged from 0.026 to 0.11 wt. In steels microalloyed with niobium, a significant loss of yield and tensile strength occurred when the carbon content exceeded approximately 0.07wt/100. Large, eutectic NbCN precipitates, which formed during solidification, were observed at higher carbon contents. It was concluded that when the carbon content of the steel exceeded a critical level, segregation of niobium to the liquid phase during solidification of the castings resulted in the presence of the eutectic NbCN. This effectively removed a significant fraction of the niobium from being able to participate in precipitation strengthening. The addition of up to 0.09wt/100 V, and of V plus up to 0.025 wt/100 Ti, to steel containing 0.04wt Nb failed to increase yield or tensile strength.
机译：在实验室规模上对薄板坯铸造微合金低碳钢的热直接轧制进行了模拟。钢的碳含量为0.026至0.11 wt。在含铌微合金化的钢中，当碳含量超过约0.07wt / 100时，会显着降低屈服强度和拉伸强度。在较高的碳含量下，观察到了凝固过程中形成的大的共晶NbCN沉淀物。结论是，当钢的碳含量超过临界水平时，铸件凝固过程中铌向液相的偏析会导致共晶NbCN的存在。这有效地去除了很大一部分铌，使其无法参与沉淀强化。向包含0.04wt％Nb的钢中添加高达0.09wt / 100 V的V和添加高达0.025 wt / 100 Ti的V不能提高屈服强度或拉伸强度。

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