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为了确定UPF树脂对球墨铸铁、铸钢件质量的影响,对铸型—金属界面区铸态组织进行研究:应用扫描电子显微镜观察气孔缺陷内表面,并对铸件中碳、氮元素进行线、面扫描以确定其对铸件组织的影响程度. 研究表明,UPF树脂砂用于球铸铁件比煤粉砂更易使铸件产生皮下气孔缺陷.对于壁厚不太大的铸钢件,无论砂芯刷涂料与否,产生气孔缺陷的危险性都很小。UPF树脂含氮量高低,对球墨铸铁均无明显的氮元素富集倾向,对于壁厚不大的铸钢件也未发现明显的碳、氮富集倾向. UPF树脂用于球墨铸铁件和小型铸钢件,不会对铸件组织产生不利的影响,如果采取适当的工艺措施,也可减少或消除球墨铸铁件的气孔缺陷.
In order to determine the effect of UPF resin on the quality of ductile cast iron and steel castings, the as-cast microstructure of the mold-metal interface was studied. The inner surface of pores was observed by scanning electron microscopy. Scanning to determine the degree of impact on the casting organization.Studies show that the UPF resin sand for the ball cast iron castings than the coal is more likely to produce subcutaneous porosity defects.For the wall thickness is not too large castings, Or not, the risk of stomatal defects are small. The nitrogen content of UPF resin has no obvious nitrogen enrichment tendency for ductile iron and no obvious carbon and nitrogen enrichment tendency for steel castings with small wall thickness UPF resin is used for ductile iron and small Cast steel, castings will not adversely affect the organization, if taken appropriate process measures can also reduce or eliminate porosity ductile iron castings defects.