钢坯枝晶腐蚀低倍检验技术的试样制备方法  

Specimen preparation method of steel billet for dendrite corrosion

作　　者：吴春雷 史纯阳 孙野[1] 刘研[1] 朱月阳 WU Chunlei;SHI Chunyang;SUN Ye;LIU Yan;ZHU Yueyang(School of Metallurgy Engineering,Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China;Global 100-100 School,Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China;PMA Pacific Machinery Company Limited,Suzhou 215126,Jiangsu,China)

机构地区：[1]辽宁科技学院冶金工程学院,辽宁本溪117004 [2]辽宁科技学院中美双百学院,辽宁本溪117004 [3]帕玛自动化科技(苏州)有限公司,江苏苏州215126

出　　处：《连铸》2023年第4期29-33,共5页Continuous Casting

基　　金：辽宁省自然科学基金资助项目(2022-MS-365);辽宁省科技厅博士科研启动基金(2022-BS-297);辽宁省教育厅基本科研项目(面上项目)(LJKZ1071);辽宁“百千万人才工程”培养经费资助项目(辽人社[2019]45号)。

摘　　要：全新的枝晶腐蚀低倍检验技术对钢坯试样的表面粗糙度和制备效率提出了更高要求。采用砂带机制备钢坯试样,考察使用不同粒数砂带时的精磨加工用时和表面粗糙度的变化规律,以此确定采用砂带磨削制备钢坯试样的最优方法。结果显示,对于表面凹凸不平、条件恶劣的钢坯试样,使用700μm(24目)砂带能够快速去除氧化层,并获得光滑平整待检面,达到与铣床相同的加工效果。使用120μm (120目)砂带开始对表面平整的待检面精磨,前后2次砂带的打磨方向保持垂直。随着砂带粒数减小,待检面粗糙度逐渐减低,在经6.5μm (2 000目)砂带精磨后,横、纵向表面粗糙度均小于0.1μm,满足枝晶腐蚀检测要求。在精磨待检面时,需要在使用起始粒数和低于23μm (600目)砂带打磨更长时间,以保证对待检面的精磨效果。因此,采用砂带磨削能够高效地完成枝晶腐蚀检验的试样制备工作。As a novel macro-examination method,dendrite corrosion macro-examination demands higher requirements for the surface roughness and the preparation efficiency of steel billet specimens.The specimens were ground by an abrasive belt machine.The operation duration and the variation of surface roughness were investigated to determinate the optimum process for preparing steel billet specimens by abrasive belt grinding.The results show that for the specimens with a bumpy surface,the abrasive belt with mesh number 24(700μm)can be used to quickly remove the oxide layer and obtain a smooth and flat surface,which reaches the same effect as that by the milling machine.The abrasive belt with mesh number 120(120μm)can be used as the initial one to fine grind the flat surface.The grinding directions of the two successive abrasive belts remains vertical.With the mesh number increasing,the surface roughness gradually decreases.After completing grinding with the mesh number 2000(6.5μm),both the horizontal and vertical surface roughness can reach less than 0.1μm,which meets the requirements of the dendrite corrosion macro-examination.During the fine grinding,it is requisite to grind the specimens for a longer time when using the initial mesh number or the mesh number higher than 600(23μm),to ensure the fine grinding effect on the specimen surface.Thus,by abrasive belt grinding,the specimen preparation for the dendrite corrosion macro-examination can be efficiently completed.

关 键 词：枝晶腐蚀低倍检验 连铸 砂带磨削 表面粗糙度 凝固组织 

分 类 号：TG174.3[金属学及工艺—金属表面处理]