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Effect of v and v-N Microalloying on Deformation-Induced Ferrite Transformation in Low Carbon steels

Journal of Materials Science & Technology 2006年第2期22卷 159-163页

作者： Kai WANG Lijun WANG Wenfang CUI Chunming LIU School of Materials and Metallurgy Northeastern University Shenyang 110004 China

Deformation-induced ferrite transformation （DIFT） has been proved to be an effective approach to refine ferrite grains. This paper shows that the ferrite grains can further be refined through combination of DIFT and v or v-N microalloying. vanadium dissolved in γ matrix restrains DIFT. During deformation, vanadium carbonitrides rapidly precipitate due to strain-induced precipitation, which causes decrease in vanadium dissolved in matrix and indirectly accelerates DIFT. Under heavy deformation, deformation induced ferrite （DIF） grains in v microalloyed steel were finer than those in v free steel. The more v added to steel, the finer DIF grains obtained. Moreover, the addition of N to v microalloyed steels can remarkably accelerate precipitation of v, and then promote DIFT. However, DIF grains in v-N microalloyed steel easily coarsen.

关键词： Deformation induced ferrite transformation Strain induced precipitation v microalloyed steel v-N microalloyed steel Thermomechanical simulation

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Grain Refinement in v and v-N microalloyed Low Carbon steels

Grain Refinement in V and V-N Microalloyed Low Carbon Steels

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第二届先进钢铁结构材料国际会议

作者： WANG Kai WANG Lijun Zuo Liang Liu Chunming (School of Materials and Metallurgy Northeastern University Shenyang 110004 China)

＜正＞Deformation induced ferrite transformation （DIFT） has been proved to be an effective approach to refine ferrite grains. This paper shows that the ferrite grains can further be refined through combination of DIFT and v or v-N microalloying. vanadium dissolved in γmatrix has remarkable effect on dynamic transformation of γto α, but little effect on static transformation of γto α. Dissolved vanadium restrains the dynamic transformation of γto α. During deformation, vanadium carbonitrides rapidly precipitate due to strain induced precipitation, which cause decrease of dissolved vanadium and indirectly accelerate the dynamic transformation of γto α. Moreover, the addition of nitrogen to vanadium microalloyed steels can remarkably accelerate the precipitation of vanadium, and then promote dynamic transformation of γto α.

关键词： Ultra-fine Grain Deformation Induced Precipitation v microalloyed steel v-N microalloyed steel

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