张鹤松,朱国明,康永林

• 1:北京科技大学材料科学与工程学院
• 2:材料先进制备技术教育部重点实验室

摘要(Abstract)：

利用超快冷工艺在2250热连轧生产线生产X90管线钢,通过光学显微镜和扫描电镜观察组织,利用透射电镜观察微观结构和析出形貌,通过物理化学相分析及理论计算对析出规律进行研究,并对应变时效性能进行了研究。结果表明,X90管线钢屈服强度615~645 MPa,抗拉强度808~844 MPa,屈强比低于0.8,-20℃冲击功均在300 J以上;基体为由准多边形铁素体、粒状贝氏体、贝氏体铁素体及马氏体奥氏体组元构成的复相组织;析出为Ti、Nb的碳氮化物,超快冷工艺使管线钢中析出过程有效避开了析出鼻尖温度,从而使析出粒子更加细小弥散,析出沉淀强化作用理论计算值为92 MPa;经应变时效后拉伸曲线由Round-House形转变为Luders伸长型,出现明显的屈服平台,屈服强度增加250~280 MPa。

关键词(KeyWords)： 超快冷;X90;组织性能;强化机制;应变时效

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(863计划)项目(2013AA031601);; 国家“十二五”科技支撑计划项目(2012BAF04B01)

作者(Author): 张鹤松,朱国明,康永林

DOI: 10.13289/j.issn.1009-6264.2015.12.018

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