14Cr-ODS合金粉球磨过程中的显微结构变化及合金化进程  

Microstructure and alloying progress of 14Cr-ODS powders during ball milling

作　　者：邱涛[1] 严菊杰 沈琴[1] 汪波[1] 王晓姣[1] 刘文庆[1] 

机构地区：[1]上海大学微结构重点实验室,上海200444

出　　处：《材料热处理学报》2015年第7期13-17,共5页Transactions of Materials and Heat Treatment

基　　金：上海市科学技术委员会重点项目(12JC1404000)

摘　　要：利用OM、SEM、EDS和XRD等测试手段研究了球磨转速和球磨时间对14Cr-ODS合金粉的形貌、显微结构及物相的影响。结果表明,转速为250 r/min时,随着球磨时间的延长,粉末粒径增大,16 h时基本稳定;点阵参数增大,晶粒尺寸不断减小并趋于稳定;12 h时颗粒内部出现层状结构并不断细化直至消失,颗粒成分更接近名义成分。12 h时合金化已开始,持续球磨使合金化程度提高,30 h时基本实现合金化。合金化过程可分为包覆、粘结、分层、细化、均匀化5个阶段。当转速提高到300 r/min时,合金化进程加快。The variation of morphology,microstructure and phase constituent of 14Cr-ODS（ Oxide dispersion strengthened steel,ODS）powders during mechanical ball-milling were investigated by using optical microscopy（ OM）,scanning electron microscopy（ SEM）,energy dispersive X-ray spectroscopy（ EDS） and X-ray diffraction（ XRD）. It is demonstrated that for a given rotating rate of 250 r / min,the size of powder particle increases gradually with increasing milling-time until 16 h. Moreover,their grain size is reduced down to a constant value and the lattice parameter becomes larger. For the powder sample mechanically milled for 12 h,the composition of particles is determined to be very close to the nominal one while the laminated structure can be observed,which however becomes invisible ultimately for the particle refinement. It is thus believed that the mechanical alloying starts to take place in the alloy system at about 12 h but is completed after 30 h. Consequently,the mechanical alloying process can be divided into five consecutive stages： cladding,bonding,laminating,refining and homogenization. Furthermore,it is found that the kinetics of mechanically alloying is speeded up with increasing the ball-milling speed.

关 键 词：ODS钢 机械合金化 微观形貌 显微结构 合金化程度 

分 类 号：TG142.4[一般工业技术—材料科学与工程]