姚三成,宫彦华,赵海,江波,刘学华,浦红

• 1:高性能轨道交通新材料及安全控制安徽省重点实验室
• 2:马鞍山钢铁股份有限公司技术中心

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、电子背散射(EBSD)、拉伸试验及断裂韧性试验等研究了奥氏体化加热温度对钒微合金中碳钢珠光体等温转变组织特征及强韧性的影响。结果表明:随加热温度的提高,实验钢的强度先大幅提高,在930℃时达到最大后略降。890℃时原奥氏体晶粒尺寸(AGS)细小且均匀,当加热温度为930℃及以上时,AGS显著增大且不均匀,珠光体团尺寸(PCS)的变化趋势与AGS一致。PCS对断裂韧性K_Q值的影响可用式K_Q=196.578-16.876PCS来表达。断口分析表明,珠光体团界对解理滑移带起约束作用,减小珠光体团尺寸对韧性优化有利。合理选取加热温度,控制含钒沉淀相的溶解比例,是获取较理想的组织参量及强韧性匹配的关键。

关键词(KeyWords)： 钒微合金中碳钢;加热温度;晶粒尺寸;珠光体团;强韧性

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础发展研究计划(“973”计划)(2015CB654800)

作者(Author): 姚三成,宫彦华,赵海,江波,刘学华,浦红

DOI: 10.13289/j.issn.1009-6264.2019-0366

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