V、Nb与变形条件对含钒微合金钢形变强化相变的影响  

Effect of V,Nb and Deformation Condition on Deformation Enhanced Ferrite Transformation in V-microalloying Steel

作　　者：李新城[1] 张炎[2] 姜银方[2] 蒯苏苏[3] 蔡守桂[1] 

机构地区：[1]江苏大学先进成型技术研究所,镇江市212013 [2]江苏大学机械工程学院 [3]江苏大学工程训练中心

出　　处：《农业机械学报》2008年第5期186-191,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50775102);江苏省高校自然科学基金重点项目(项目编号:04KJA430021)

摘　　要：为探明钢中微合金元素(V、Nb)与变形条件对含钒钢形变强化相变的影响规律,为制备含钒超细晶粒钢提供理论依据,通过对含钒钢进行形变强化相变热模拟试验,分析得出V、Nb的影响为:固溶V、Nb不利于形变强化铁素体相变的进行;V(C,N)、V-Nb(C,N)可以在多道次变形中沉淀析出,成为铁素体的异质形核核心,同时析出相对晶界及亚结构的钉扎作用使铁素体晶粒细化。研究表明,多道次变形时,道次间隔时间越短,温度越低,则累积的有效变形量越大,钢的形变强化相变越易进行,含钒钢超细晶铁素体体积分数越大。To provide a theoretical basis for producing ultra-fine grained steel and find out the effect of micro alloying element and deformation condition on deformation enhanced ferrite transformation in vanadium-alloyed steel, a deformation enhanced ferrite transformation （DEFT） thermal simulation test on vanadium-alloyed steel was carried out. The effect of V, Nb on DEFT was analyzed as two aspects： V, Nb solutionized in steel confine DEFT; on the other hand, V（C, N） and V -Nb（C, N） are induced precipitation by multiple-pass deforming, which provides nucleating center to intragranular ferrite （IGF）, meanwhile, V（C, N） and V - Nb（C, N） pinned substructure to make them steady, and simultaneity the substructure transforms to ultra-flne ferrite. The experimental results showed that the interval between multiple-pass deforming is shorter and the temperature is lower, then the accumulated deformation is larger, the DEFT is easier and the volume fraction of ultra-fine ferrite is greater.

关 键 词：含钒钢 形变强化铁素体相变 有效变形量 超细晶 析出相 

分 类 号：TG111.2[金属学及工艺—物理冶金]