回火对等通道角变形FeCoV合金组织的影响  

Influence of tempering on microstructure of FeCoV alloy deformed by equal channel angular pressing

作　　者：杜忠泽[1] 伍来智[2] 符寒光[3] 王庆娟[1] 王经涛[4] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]上海交通大学模具CAD国家工程研究中心,上海200030 [3]西安交通大学材料科学与工程学院,陕西西安710049 [4]南京理工大学材料科学与工程系,江苏南京210094

出　　处：《材料热处理学报》2008年第1期47-53,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(59974018);陕西省教育厅专项基金(05JK229)

摘　　要：用透射电镜研究了等通道变形(ECAP)的FeCoV合金在不同回火温度的组织变化。结果表明,4道次ECAP变形FeCoV合金经回火后发生纳米尺度相析出。其析出过程是首先在原来的等轴状亚晶晶界、细板条晶界上析出大的碳化物颗粒,大的碳化物颗粒中析出小的碳化物颗粒和纳米尺度析出相。随着析出的进一步进行,纳米尺度析出相所占的比例逐渐上升。随着回火温度的升高,纳米尺度析出相发生长大现象。沿挤压面(S面)析出的效果好,析出相分布密度高;沿侧面(L面)析出效果较差,大部分析出区域只发生大的碳化物颗粒析出小的碳化物颗粒的过程,纳米尺度析出相所占的比例不大,且纳米尺度析出相迅速发生长大。By means of transmission electron microscopy （TEM）, the microstructure evolution of FeCoV alloy deformed by equal channel angular pressing （ECAP） and tempered at different temperatures was investigated. The results show that FeCoV alloy deformed by ECAP for four passes produce the nano-precipitates after tempering. The process of precipitation is as follows in the process of tempering. Firstly, some big carbide particles separate from the boundary of equiaxial subgrain and thin laths. The fine carbide and nanophase separate from the big carbide particles. With the proceeding of precipitation, the proportion of nanophase increases. The nanophase grow up with increasing of tempering temperature. The precipitation obviously occurs and high density of precipitated phase is observed on the extruding surface. The less effectiveness of precipitation is observed on the side face （L） of the ECAPed sample.

关 键 词：FeCoV合金 等通道角变形(ECAP) 回火 析出相 

分 类 号：TG156.5[金属学及工艺—热处理] TG132.2[金属学及工艺—金属学]