纳米级析出相对微合金钢组织超细化的影响  

Effect of nanoscale precipitation phase on microstructure refinement in microalloyed steels

作　　者：李新城[1] 张云[1] 庄志平[1] 陈炜[2] 陈轶[1] 

机构地区：[1]江苏大学先进成型技术研究所,江苏镇江212013 [2]江苏大学模具技术研究所,江苏镇江212013

出　　处：《材料热处理学报》2013年第11期79-83,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50775102);江苏高校优势学科建设工程资助项目

摘　　要：为探明纳米级析出相对微合金钢组织超细化的影响,通过对含钒钢进行形变强化相变热模拟试验,分析V(C,N)纳米相在试验钢中的析出特点,并研究了V(C,N)纳米相对增加晶内铁素体的作用。结果表明:在奥氏体晶界、亚晶界、位错等析出的纳米相都能增加晶内铁素体,在奥氏体中析出的纳米相因其异质形核作用亦能增加晶内铁素体,且纳米析出相的粒径与超细晶铁素体体积比及晶粒尺寸有着显著的线性关系。In order to find out the effect of nanoscale precipitated phases on microstructure refinement in mieroalloyed steels, a deformation enhanced ferrite transformation （DEFT） process was applied to vanadium-alloyed steels by thermal simulation on a Gleeble-3500 thermal simulator. The characteristics of V （C, N） nanophase precipitated in the tested steel were analyzed and the role of V （C, N） nano phase in the increasing of intra-granular ferrite （IGF） was studied. The results show that the nanophase precipitated at austenitie grain boundaries, sub-grain boundaries and dislocations can increase the amount of IGF, the nanophase precipitated in austenite can also promote the fomation of IGF because of its heterogeneous nucleation effect, and the volume ratio and size of ultra-fine grain ferrite have linear relationship with the particle size of nanoscale precipitated phases.

关 键 词：纳米级析出相 微合金钢 组织超细化 形变强化相变 晶内铁素体 

分 类 号：TG142.33[一般工业技术—材料科学与工程]