陈伟,施哲,陈红,曹建春,赵宇

• 1:昆明理工大学冶金与能源工程学院
• 2:武钢集团昆明钢铁股份有限公司
• 3:昆明理工大学材料科学与工程学院

摘要(Abstract)：

针对富氮钒铌微合金化控冷工艺生产的500 MPa高强钢筋,利用热模拟试验,通过SEM、硬度试验、TEM及XRD研究了精轧后采用不同控冷温度对钢筋显微组织、晶粒度、硬度及析出相的影响。结果表明,控冷终止温度控制在720~740℃,显微组织为细小块状铁素体+珠光体+少量贝氏体(含量6%~15%),组织配比及形态较好,有利于钢筋强度提高和塑韧性的改善;铁素体晶粒度为10.5~11.0级,细晶强化及抗震性能较好;试样维氏硬度为208~213 HV,其对应的抗拉强度R m为700~720 MPa,强度富余量适中;铁素体基体、晶界及位错线上形成和分布着尺寸为5~30 nm的大量细小弥散的V(CN)、Nb(CN)析出相,析出相的体积分数70%,起到了较好的沉淀强化及细化晶粒作用。

关键词(KeyWords)： 500 MPa高强钢筋;控冷温度;显微组织;硬度;析出相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51261009);; 云南省科技计划项目(2009BA008)

作者(Author): 陈伟,施哲,陈红,曹建春,赵宇

DOI: 10.13289/j.issn.1009-6264.2013.10.012

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