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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Vanadium Microalloyed Steel for Thin Slab Casting and Direct Rolling
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Vanadium Microalloyed Steel for Thin Slab Casting and Direct Rolling

机译：薄板坯连铸和连轧用钒微合金钢

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摘要

Vanadium microalloyed steels with high yield strength (≈600MPa), good toughness and ductility have been successfully produced in commercial thin slab casting plants employing direct rolling after casting. Because of the high solubility of VN and VC, most of the vanadium is likely to remain in solution during casting, equalisation and rolling. While some vanadium is precipitated in austenite as cuboids and pins the grain boundaries, a major fraction is available for dispersion strengthening of ferrite. Despite a coarse as-cast grain size, significant grain refinement can be achieved by repeated recrystallisation during hot rolling. Consequently, a fine and uniform ferrite grain structure is produced in the final strip. Increasing the V and N levels increases dispersion strengthening which occurs together with a finer ferrite grain size. The addition of titanium to a vanadium containing steel, decreases the yield strength due to the formation of V-Ti(N) particles in austenite during both casting and equalisation. These large particles reduced the amount of V and N available for subsequent precipitation of fine (～5nm) V rich dispersion strengthening particles in ferrite.
机译：具有高屈服强度（≈600MPa），良好的韧性和延展性的钒微合金钢已在采用铸造后直接轧制的商业薄板坯铸造厂中成功生产。由于VN和VC的高溶解度，大多数钒可能在浇铸，均化和轧制过程中保留在溶液中。尽管一些钒以长方体形式沉淀在奥氏体中并束缚了晶界，但大部分可用于弥散强化铁素体。尽管铸态晶粒尺寸较大，但通过在热轧过程中重复进行再结晶，仍可以实现明显的晶粒细化。因此，在最终的钢带中产生了细而均匀的铁素体晶粒结构。 V和N含量的增加会增强弥散强化，这与较细的铁素体晶粒尺寸一起发生。将钛添加到含钒的钢中会降低屈服强度，这是因为在铸造和均化过程中奥氏体中均会形成V-Ti（N）颗粒。这些大颗粒减少了可用于随后在铁素体中沉淀出细小（约5nm）富V弥散强化颗粒的V和N量。

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