Refinement mechanism of ultrafine-grain vanadium-containing dual phase steel
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摘要: 利用鐵素體+馬氏體+貝氏體的初始顯微組織結合冷軋和連續退火的方法達到了細化晶粒的目的,通過這種方式制備的雙相鋼中有63.8%的鐵素體晶粒尺寸分布于0.5～1μm,有53%的馬氏體晶粒尺寸分布于0.5～1μm.針對該現象研究了基于鐵素體+馬氏體+貝氏體初始顯微組織含釩超細晶雙相鋼的晶粒細化機制.分析認為,細化機制主要有三個方面:第一是形變對顯微組織的細化,包括為了得到鐵素體+馬氏體+貝氏體的初始顯微組織而進行的熱軋和冷軋;第二是冷軋態顯微組織的再結晶和快速奧氏體化;第三是釩的析出物阻礙奧氏體的長大.Abstract: Dual phase steel with 63.8% of ferrite grains and 53% of martensite grains in the size distribution of 0.5 to 1 μm was produced through adopting the initial microstructure of ferrite,bainite and martensite in combination with the cold rolling and continuous annealing process.The grain refining mechanism of vanadium-containing dual phase steel based on the initial microstructure of ferrite,martensite and bainite was investigated.It is found that the refining theory mainly has three aspects:(1) microstructure refinement by deformation including hot rolling and cold rolling for the initial microstructure of ferrite,martensite and bainite;(2) recrystallization and rapid austenitization of the as-cold rolled microstructure;and(3) vanadium precipitation preventing austenite from growing up.
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Key words:
- dual phase steel /
- ultrafine grain /
- vanadium /
- refinement mechanism
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