电工钢中柱状晶热压缩时取向的变化及对析出的影响  

Evolution of Orientations and Their Influence on Precipitation During Hot Compression of Columnar-grained Electrical Steel

作　　者：邵媛媛[1] 杨平[1] 毛卫民[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2014年第10期75-81,共7页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51071024);国家自然科学基金资助项目(51171019)

摘　　要：利用电子背散射衍射(EBSD)技术和场发射电子扫描显微镜(FESEM)研究了电工钢中柱状晶不同初始取向50%热压缩变形后的演变规律及其对粒子析出行为的影响。结果表明:〈100〉晶粒形变后仍为〈100〉取向,只发生绕ND∥〈100〉方向的转动,具有遗传性,粒子析出数量少。柱状晶长轴与压缩轴的偏转度增加,取向的稳定性变差,超过40°,可形成〈111〉取向,期间发生复杂的滑移系交互作用,产生较高的缺陷密度,促进粒子析出。MnS粒子主要在晶内析出,变形温度高、形变量低,粒子均无法充分析出。回复时,形变晶粒内高的储能和缺陷密度是促进粒子进一步析出的必要条件。The evolution of initial orientations and their influence on precipitation of columnar-grained electrical steel after 50% hot compression deformation were investigated by electron backscatter diffraction technique and field emission scanning electron microscopy. The results indicate that the （100） orientated columnar grains remain still （100） after hot compression deformation, with only rotation around ND parallel to （100） direction, with heredity, and less precipitation. As the deviation angle between the long axis of columnar grain and the compression axis increases, the stability of initial grain orientation becomes poor, when the deviation angle is higher than 40°, the （111） oriented grains can be formed, during which higher defect density is formed due to the complex interaction of slip systems which facilitate the MnS precipitation. The MnS particles nucleate dominantly within hot compressed grains, particles can not be precipitated thoroughly either at high temperature or low reduction rate during hot compression, and in a subsequent recovery, the high deformation energy storage and defect density are prerequisite to promote further precipitation.

关 键 词：电工钢 柱状晶 取向 粒子 析出 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG115[金属学及工艺—金属材料]