刘方策,王杨,孔祥磊,刘干,黄明浩

• 1:海洋装备用金属材料及其应用国家重点实验室
• 2:鞍钢集团钢铁研究院

摘要(Abstract)：

使用光学显微镜、扫描电镜、电子探针和透射电镜对不同加热温度下Ti微合金化低碳钢的微观组织和夹杂物特征进行了研究。结果表明：随着加热温度由1050℃升高至1320℃,原始奥氏体晶粒尺寸从20μm增大至129μm,针状铁素体的体积分数先增加后减少，在1250℃时达到最大值51%;Ti微合金化钢中复合夹杂物的核心为Ti_2O_3,MnS在Ti_2O_3的表面上沿特定的晶面和晶向析出，夹杂物能够有效地促进针状铁素体形核；针状铁素体的形成能够分割原始奥氏体晶粒、细化组织，因此在1250℃的加热条件下Ti微合金化钢具有最小的有效晶粒尺寸；随着加热温度的升高，总体夹杂物的数量密度减少、平均尺寸增大，然而有效夹杂物的数量密度先增加后减少；结合针状铁素体体积分数和有效夹杂物数量密度的变化规律，1250℃为Ti微合金化钢有利于针状铁素体形成的最佳温度。

关键词(KeyWords)： 加热温度;Ti微合金化;针状铁素体;夹杂物

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘方策,王杨,孔祥磊,刘干,黄明浩

DOI: 10.13289/j.issn.1009-6264.2025-0005

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