电子探针参数设置对钢板表面富集元素表征的影响

以HC300W热成型钢为研究对象,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3.66μm、5.72μm增大到7.91μm...

Influence of EPMA parameters on the characterization of alloying element enrichment on steel plate surface

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.