李家旺,刘方策,王琪,贺彤,刘沿东

• 1:东北大学材料科学与工程学院

摘要(Abstract)：

采用扫描电镜、光学显微镜和万能力学试验机等研究了含Al和Ti的低碳钢高温热轧后的夹杂物特征、微观组织及力学性能。结果表明:含Al低碳钢中夹杂物以Al_2O_3为主,组织主要由粗大的贝氏体铁素体(BF)和准多边形铁素体(QPF)组成;含Ti低碳钢中夹杂物主要类型是Ti_2O_3和Ti_2O_3-MnS,组织主要由尺寸细化的BF+QPF及针状铁素体(AF)组成。与含Al低碳钢相比,含Ti低碳钢中夹杂物的数量显著增多,尺寸明显细化,由于夹杂物对原奥氏体晶界迁移的钉扎效果明显且Ti_2O_3-MnS型夹杂物可有效诱导针状铁素体(AF)形核,含Ti低碳钢组织细化明显。含Ti低碳钢的低温冲击韧性良好,而含Al低碳钢韧性在-20～0℃内急剧恶化,夹杂物的钉扎作用和诱导AF形核是含Ti低碳钢低温冲击韧性良好的主要原因。

关键词(KeyWords)： 高温热轧;夹杂物;针状铁素体;冲击韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U1860201);; 中央高校基本科研业务专项资金资助项目(N2002004)

作者(Author): 李家旺,刘方策,王琪,贺彤,刘沿东

DOI: 10.13289/j.issn.1009-6264.2021-0011

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