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Ferrite Grain Size Refinement in Vanadium Microalloyed Structural Steels

机译:钒微合金结构钢中的铁素体晶粒细化

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摘要

The addition of small quantities of vanadium in structural steels produces a significant refinement in the final ferrite microstructure. There are two different mechanisms contributing to refinement: enhancement of grain boundary ferrite nucleation and intragranular nucleation. The contribution of each mechanism depends on the vanadium content and heat treatment of the steel, In this study the contribution of both refining mechanisms has been evaluated for two V-microalloyed steels subjected to different heat treatments. The results confirm that this refinement is based on the enhancement of ferrite nucleation through particle-stimulated nucleation mechanisms, while other aspects, as the influence of vanadium slowing down the austenite-ferrite transformation kinetics, seem to exert a minor effect.
机译:在结构钢中添加少量钒会使最终的铁素体显微组织显着改善。有两种不同的机制有助于细化:增强晶界铁素体成核和颗粒内成核。每种机理的作用取决于钢中的钒含量和热处理。在本研究中,已经对两种经过不同热处理的V型微合金钢评估了两种精炼机理的作用。结果证实,这种细化是基于通过颗粒激发的成核机制增强铁素体成核作用,而其他方面,由于钒的影响使奥氏体-铁素体转变动力学减慢,似乎起了很小的作用。

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