18CrNiMo7-6中低合金钢连铸圆坯的原位统计分布分析  

Original Position Statistic Distribution Analysis of Continuous Casting Round Billet of 18CrNiMo7-6 Low and Middle Alloy Steel

作　　者：王辉[1,2] 金呈 赵雷 于雷[3] 蔺菲 孙晓飞 贾云海 WANG Hui;JIN Cheng;ZHAO Lei;YU Lei;LIN Fei;SUN Xiao-fei;JIA Yun-hai(Central Iron and Steel Research Institute,Beijing 100081,China;Beijing Key Laboratory of Metal Material Characterization,Beijing 100081,China;NCS Testing Technology Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院,北京100081 [2]金属材料表征北京市重点实验室,北京100081 [3]钢研纳克检测技术股份有限公司,北京100081

出　　处：《光谱学与光谱分析》2020年第12期3906-3911,共6页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划重大科学仪器设备开发专项(2017YFF0106200)资助。

摘　　要：连铸过程中会不可避免地出现中心偏析,中心偏析影响钢材均匀性,严重的中心偏析会对钢材的组织、质量和性能产生很大的影响。准确、快速、方便地对钢中元素含量分布进行分析,将有助于指导冶金工作者进行质量控制和工艺改进。原位统计分布分析是在较大尺度范围内(cm^2)各化学组成及其形态的定量统计分布规律的分析技术,在钢铁、高温合金等的元素偏析、疏松、夹杂物分析上已有成功的应用。采用原位统计分布分析方法对18CrNiMo7-6中低合金钢连铸圆坯从中心到边缘的各元素分布进行了分析,得到不同位置各试样的统计符合度、统计偏析度,同时采用火花光谱法分析各试样得到相对标准偏差,研究元素分布与统计符合度、统计偏析度、相对标准偏差的相关规律。结果表明,各试样P, Nb和S存在明显的偏析,整体的统计符合度较低,统计偏析度、相对标准偏差较大;各试样Cr, Ni, Mn, Mo和Si分布较均匀,整体的统计符合度较高,统计偏析度、相对标准偏差较小。圆坯中心部位的6^#样品在10块样品中各元素偏析最明显,统计符合度最低,统计偏析度、相对标准偏差最大;靠近中心部位的3^#, 7^#, 4^#样品各元素偏析较明显,各元素统计符合度较低,统计偏析度、相对标准偏差较大;圆坯边缘部位的9^#和10^#样品偏析程度最轻,各元素统计符合度最高,统计偏析度、相对标准偏差最小。各元素整体上按照从中心到边缘统计符合度逐渐增大,统计偏析度、相对标准偏差逐渐减小的规律分布。原位统计分布分析的统计符合度、统计偏析度结果与火花光谱分析的相对标准偏差结果在各试样的元素偏析上呈现出相同的规律。由原位统计分布分析得到各试样的元素含量等高图趋势与统计符合度、统计偏析度、相对标准偏差结果也呈现出相同的规律。因此,原位统计分布分析技术�Central segregation will inevitably occur in the continuous casting process,which will affect the homogeneity of steel.Serious central segregation will have a great impact on the structure,quality and performance of the steel.Therefore,accurate,rapid and convenient analysis of the element content distribution in steel will help guide metallurgists to quality control and process improvement.Original position statistic distribution analysis(OPA)is a quantitative statistic distribution technique of chemical composition and morphology in a large scale(cm 2).It has been successfully used in the analysis of element segregation,porosity and inclusions in steel and super-alloy.In this paper,the element distribution of continuous casting round billet of 18CrNiMo7-6 low and middle alloy steel from the center to the edge was analyzed by original position statistic distribution analysis(OPA).The statistic conformity and statistic segregation of each sample at different positions were obtained.Meanwhile,each sample was analyzed 11 times by spark optical emission spectroscopy(OES)to obtain the relative standard deviation.The correlation of element distribution with statistic conformity,statistic segregation and the relative standard deviation was studied.The research showed that there was obvious segregation of P,Nb and S in each sample,and the statistic conformity was low.Their statistic segregation and relative standard deviation were high.The distribution of Cr,Ni,Mn,Mo and Si was relatively uniform,and the overall statistic conformity was high.Their statistic segregation and relative standard deviation were low.The sample of 6#in the center of the round billet had the most obvious segregation,the lowest statistic conformity and the hightest statistic segregation and the relative standard deviation.The samples of 3#,7#and 4#near the center had obvious segregation,low statistic conformity,high statistic segregation and relative standard deviation.The samples of 9#and 10#at the edge of the round billet had minimal segregation

关 键 词：原位统计分布分析 中心偏析 统计符合度 统计偏析度 相对标准偏差 

分 类 号：O657.31[理学—分析化学]