赵伟龙,董博闻,周梓越,张辉,毛成荣,锁必胜,接金川,李廷举

• 1:日月重工股份有限公司日月研究院
• 2:大连理工大学材料科学与工程学院

摘要(Abstract)：

利用MAGMA软件对厚大断面球墨铸铁铸件的铸造工艺进行设计及仿真分析,研究了不同冷铁分布方案和浇铸温度对球铁凝固过程中温度场及凝固速率的影响,以确定最优的铸造工艺。采用扫描电镜和能谱仪分析了厚大断面球墨铸铁轴承支座内部石墨相的形貌演变行为及其影响因素,采用相图计算(CALPHAD)方法分析了不同Mg含量对球铁相图及石墨形态的影响。结果表明:铸件局部区域存在夹杂物富集现象,且该区域石墨球化率显著下降,夹杂物主要为Mg、S化合物;Mg元素能扩大Fe-CSi相图中(FCC+Graphite+Liquid)相区的温度区间,弱化共晶反应,因此Mg元素可作为球化剂促进石墨相的球状生长,而S元素的局部富集则会削弱这一效果,导致石墨相由球状向层片状转变;S元素在冷却不均匀或凝固速度较慢的区域容易富集,主要是由于其在液相中的溶解度较高,随着温度的降低,S逐渐从液相析出并聚集在凝固滞后的局部区域。

关键词(KeyWords)： 厚大断面球墨铸铁;石墨形貌;CALPHAD;夹杂物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52201038)

作者(Author): 赵伟龙,董博闻,周梓越,张辉,毛成荣,锁必胜,接金川,李廷举

DOI: 10.13289/j.issn.1009-6264.2024-0380

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