电子探针参数设置对钢板表面富集元素表征的影响

电子探针参数设置对钢板表面富集元素表征的影响

严春莲，崔桂彬，鞠新华

（首钢集团有限公司技术研究院，北京100043）

摘  要 以HC300W热成形钢为研究对象，摸索了电子束流、加速电压和束斑尺寸等电子探针分析参数对钢板表面富集元素表征的影响，并考察了不同露点下试样表面元素的分布情况和变化趋势。结果表明：随着电子束流从50 nA、100 nA增大到200 nA时，电子探针所表征的钢板表面平均颗粒尺寸从3.66 μm、5.72 μm增大到7.91 μm；当加速电压由15 kV增大到20 kV时，平均颗粒尺寸约减小0.7 μm；分析条件推荐采用加速电压20 kV、束流50 nA、束斑尺寸为“min”，可实现冷轧钢板表面富集元素的电子探针定性定量优化表征。随着露点温度从-60℃、-30℃提高至0 ℃，HC300W钢表面锰氧化物的面积占比从6.1%、10.5%提高到19.7%，氧化物的数量逐渐增加，Mn元素的表面富集程度逐渐增大。

关键词  元素富集；电子探针；冷轧钢板；HC300W钢

中图分类号：  文献标识码：A  doi:10.3969/j.issn.1000-6281.2021.01.005

Influence of EPMA parameters on the characterization of alloying elementenrichment on steel plate surface

YAN Chun-lian, CUI Gui-bin, JU Xin-hua

（Research Institute of Technology，Shougang Group Co.，Ltd.，Beijing 100043，China）

Abstract Hot forming steel HC300W was investigated using the electron probe micro-analyzer (EPMA), and some parameters such as beam current, accelerating voltage,beam diameter were investigated and optimized to characterize the enrichment of alloying elements on the steel surface. The elemental distribution on the steel surface was conducted, and the variation of oxides was analyzed under different dew point temperatures. It was found that when beam current increased from 50nA to 200nA, the mean diameter of oxides on the steel surface would increase from 3.66μm to 7.91μm. When accelerating voltage increased from 15kV to 20 kV,the mean diameter of oxides would be reduced by 0.7μm. The analysis conditions of accelerating voltage 20kV,beam current 50nA and beam diameter “min” were recommended preferentially to qualify and quantify the element enrichmenton the external surface of cold-rolled steel plate. With the rise of dew point temperature from -60℃ to -30℃ and then to 0℃, the area percentage of manganese oxides on the steel surface increased from 6.1% to 10.5% and then to 19.7%, and the amount of manganese oxides and the enrichment degree of manganese increased gradually.

Keywords element enrichment; EPMA; cold-rolled steel plate; HC300W steel

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