贝氏体表面浮凸及其形成机制  

Bainite Surface Relief and its Formation Mechanism

作　　者：计云萍[1] 刘宗昌[1] 段宝玉[1] 任慧平[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《热处理》2009年第4期29-32,共4页Heat Treatment

基　　金：内蒙古自治区高等学校科学研究项目(NJ06073)

摘　　要：将3 mm厚的工业用60Si2Mn、60Si2CrV和22MnCrNi钢试样抛光后在真空炉中加热到1100℃奥氏体化,保温40 min,炉冷。不经浸蚀,分别采用QUANTA-400环境扫描电镜、Nanofrist-1000扫描隧道显微镜和光学显微镜观察试样,发现,贝氏体相变过程中产生了表面浮凸,表面浮凸为"帐篷形"("Λ"型),并认为贝氏体表面浮凸的产生,是由于过冷奥氏体转变为贝氏体时比体积增大,且试样表面层体积膨胀不均匀造成的。The 3 mm thick specimens made from commercial 60Si2Mn, 60Si2CrV and 22MnCrNi steels were polished and then austenitized at 1100℃ for 40 rain, followed by cooling in a vacuum furnace. The unetched specimens were instantly observed by QUANTA-400 environment scanning electron microscope, scanning tunnel micro- scope and optical microscope, respectively. The results show that the surface relief will be found during the bainite transforming and will be in the shape of ＂A＂. The formation of bainite surface relief is to be considered to arise from the increase in specific volume and the uneven volume expension in specimen case during the transformation of austenite into hainite.

关 键 词：贝氏体 表面浮凸 奥氏体 比体积 膨胀 

分 类 号：TG142.11[一般工业技术—材料科学与工程]