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利用金相、扫描电镜观察及电子探针(EPMA)面分析技术等研究了合金元素(Si、Mn、Ni、Cr)对焊丝钢盘条氧化皮显微结构的影响,并采用拉伸试验及酸洗试验评价氧化皮的剥离性。结果表明,Si、Ni和Cr元素对氧化皮显微结构的影响大于Mn元素;低碳钢的氧化皮主要为Fe的氧化物,其最内层和中间层的氧化物均以柱状晶形式垂直基体向外生长;在低碳钢基础上增加Si含量,可显著降低氧化皮总厚度,氧化皮最内层为富Si层,且氧化皮/基体界面的凹凸度增加;进一步增加Ni含量,最内层的合金富集层以锚状沿晶界向基体内延伸。降低氧化皮/基体界面凹凸度、减少合金富集层均利于氧化皮剥离,机械法对界面凹凸度更敏感,而酸洗法对氧化皮缺陷数量较敏感。
The effects of alloying elements (Si, Mn, Ni, Cr) on the microstructure of the wire rod were studied by means of metallographic examination, scanning electron microscopy and electron probe microanalysis (EPMA) The pickling test evaluated the peelability of the scale. The results show that the microstructure of the oxide scale is more affected by the elements Si, Ni and Cr than the Mn element. The oxide scale of the low carbon steel is mainly the oxide of Fe. The oxide of the innermost layer and the middle layer of the oxide layer are all perpendicular to the columnar crystal The matrix grows outwardly. Adding Si content to low carbon steel can significantly reduce the total thickness of scale, the innermost layer of oxide scale is Si-rich layer, and the roughness of oxide layer / matrix interface is increased, further increase Ni content, The inner alloy rich layer extends in the matrix along the grain boundary. Reducing the concavity and convexity of the oxide / matrix interface and reducing the enrichment of the alloy are all conducive to the stripping of the oxide scale. The mechanical method is more sensitive to the concavity and convexity of the interface, while the pickling method is more sensitive to the amount of scale defects.