高铬钢复合轧辊工作层离心铸造中大型夹杂物的分析及控制办法  

Analysis of Large Inclusions in High Chromium Steel Composite Roll Working Layer Produced by Centrifugal Casting and the Control Measures

作　　者：孙绍恒[1] 赵爱民[1,2] 赵立波 裴伟[2] 曾清华[2] 尹鸿祥[2] 李群锁 

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]北京科技大学冶金工程研究院,北京100083 [3]邢台德龙机械轧辊有限公司,河北邢台054000

出　　处：《铸造》2016年第3期211-215,共5页Foundry

基　　金："863"计划项目--高性能耐磨钢开发(2012AA03A508)

摘　　要：研究分析了高铬钢复合轧辊工作层离心铸造过程中大型夹杂物的形态和形成过程。采用光学显微镜、扫描电子显微镜和能谱仪观测了高铬钢复合轧辊工作层的夹杂物的形貌和主要成分,确定其中大型夹杂物属于外生夹杂物,含O、Na、Si等主要元素,并采用SEM、能谱仪和X射线荧光光谱分析观察和分析铸造过程中所用的钠基膨润土和锆英粉的形貌和化学成分。通过对比分析,确定了高铬钢复合轧辊工作层中大型夹杂物的主要来源是离心铸造模筒涂料所用的钠基膨润土。分析了夹杂物的形成过程,计算了夹杂物的极限上浮速度,最后给出了预防外来夹杂物的三条措施。The morphology and formation process of large inclusions in centrifugal casting process of high-chromium steel composite roll working layer is analyzed. The morphology and main component of inclusions in high-chromium steel composite roll working layer was observed by optical microscope （OM）, scanning electron microscope （SEM） and energy dispersive spectrometer（EDS）, which makes sure that large inclusions belongs to foreign inclusions containing O, Na, Si and other major elements. And the morphology and chemical composition of sodium bentonite and zircon powder used in the casting process was observed by SEM, EDS and X-ray fluorescence spectrometry （XRF）. By comparing, the main source of large inclusions in high-chromium steel composite roll working layer was sodium bentonite used in centrifugal casting mold drum. What＇s more, the formation process of inclusions was analyzed and the rising speed was calculated. Finally, the three measures to prevent foreign inclusions are given.

关 键 词：高铬钢 大型夹杂物 离心铸造 复合轧辊 涂料 

分 类 号：TG249.4[金属学及工艺—铸造]