段琳娜,赵晓丽,刘清友,贾成厂,贾书君

• 1:钢铁研究总院工程用钢研究所
• 2:钢铁研究总院中心实验室
• 3:北京科技大学材料科学与工程学院

摘要(Abstract)：

为考察冷却工艺参数对低碳贝氏体钢组织和马氏体/奥氏体(M/A)岛的影响,利用热模拟试验机对不同Mo含量的低碳贝氏体钢进行研究。结果表明,随Mo含量增加,组织中板条贝氏体和M/A岛含量增多;增大冷速、降低终冷温度均能够细化组织,提高组织中板条贝氏体的含量及显微硬度;随着冷速的升高,M/A岛含量减少,由大颗粒的球形向细小的针状转变;终冷温度在410~350℃时,M/A岛含量和尺寸随终冷温度的降低逐渐减小,终冷温度降为330℃时,组织中短棒状M/A岛数量增多,M/A岛含量也开始增多。组织中的粒状贝氏体+板条贝氏体和其上分布的尺寸细小、形状规则的M/A岛是获得实验钢强度和韧性良好匹配的最佳组织类型。

关键词(KeyWords)： 低碳贝氏体钢;马氏体/奥氏体(M/A)岛;冷却速度;终冷温度;Mo含量;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”支撑计划(2011BAE35B01)

作者(Author): 段琳娜,赵晓丽,刘清友,贾成厂,贾书君

DOI: 10.13289/j.issn.1009-6264.2014.10.027

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