9Cr2Mo钢中贝氏体的组织形貌  

MICROSTRUCTURE AND MORPHOLOGY OF BAINITE OF 9Cr2Mo STEEL

作　　者：计云萍[1] 刘宗昌[1] 任慧平[1] 王玉峰[1] 李文学[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010

出　　处：《理化检验（物理分册）》2008年第10期529-532,539,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：内蒙古自治区高等学校科学研究项目(NJ06073)

摘　　要：采用光学显微镜和扫描电子显微镜等技术手段观察了经1 100℃奥氏体化的9Cr2Mo钢在不同温度的盐浴中等温淬火后贝氏体的组织形貌。结果表明:9Cr2Mo钢1 100℃奥氏体化后,在410℃的硝盐浴中等温得到羽毛状的经典上贝氏体组织,在350℃的硝盐浴中等温得到针状(或片状)的下贝氏体组织;上贝氏体铁素体铁素体是在奥氏体晶界处形核并向晶内生长,碳化物在铁素体条间分布;下贝氏体是在奥氏体晶内形核,碳化物分布在铁素体片中间,碳化物大多数与片条的主轴方向交角排列,但角度不等。The microstructure and morphology of bainite of 9Cr2Mo steel austenitized at 1 100℃ and isothermally quenched in salt bath at different temperature were studied by metallographic microscope and SEM. The observed results show that upper bainite and lower bainite of 9Cr2Mo steel are obtained after the steel has been austenitized at 1 100℃ and then been isothermally quenched in salt bath at 410℃ and 350℃ respectively. Upper bainitie ferrites nucleate at austenite gains boundary and grow toward austenite gain inner and upper bainitie carbide distribute between bainitic ferrites. Lower bainite ferrites nucleate in austenite gains and lower bainite carbide distribute between bainitic ferrites, furthermore, the angles between lower bainite carbide and the principal axis of the lower bainite are unequal.

关 键 词：9CR2MO钢 等温淬火 贝氏体 形核 

分 类 号：TG142.45[一般工业技术—材料科学与工程]