摘要
通过热模拟实验研究了变形温度和变形量对含铌HRB400E微合金化钢筋组织和力学性能的影响。结果表明:当变形温度为850℃,第二道次变形量为35%时,试验钢的屈服强度为562.14 MPa,抗拉强度为645.78 MPa,伸长率为32%,平均晶粒尺寸为8.7μm,组织比较均匀,综合力学性能最佳。这主要是因为在此条件下实验钢的第二相析出物细小弥散,不仅可以起到显著的沉淀强化作用,而且为后续铁素体相变提供更多有利形核点,实现了细化晶粒的目的,明显改善了试验钢的力学性能。
Effect of deformation temperature and deformation amount on microstructure and mechanical properties of niobium-containing HRB400E microalloyed steel bars was studied by thermal simulation experiment.The results show that when the deformation temperature is 850℃and the second pass deformation is 35%,the yield strength of the experimental steel is 562.14 MPa,the tensile strength is 645.78 MPa,the elongation is 32%,the average grain size is 8.7μm,the microstructure is relatively uniform and the comprehensive mechanical properties are the best.This is mainly due to the second phase precipitates of the experimental steel are fine and dispersed under this condition,which can not only play a significant role in precipitation strengthening,but also provide more favorable nucleation points for subsequent ferrite transformation,achieve the purpose of refining grains,and significantly improve the mechanical properties of the experimental steel.
作者
冯磊
鲍思前
张永青
钱学海
陈学良
钱臻
李铭泉
FENG Lei;BAO Si-qian;ZHANG Yong-qing;QIAN Xue-hai;CHEN Xue-liang;QIAN Zhen;LI Ming-quan(Key Laboratory of Iron and Steel Metallurgy and Resource Utilization,Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;CITIC Microalloying Technology Center,CITIC Metals Co Ltd,Beijing 100004,China;Technology Center of Liuzhou Iron and Steel Company Limited,Liuzhou 545000,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2023年第9期150-160,共11页
Transactions of Materials and Heat Treatment
基金
中信CBMM铌钢研究与开发资助项目(R&D)(2021FWNB-30057)。
关键词
铌微合金化钢筋
控轧控冷
热模拟
组织性能
析出物
niobium-microalloyed steel bar
controlled rolling and controlled cooling
thermal simulation
microstructure and property
precipitation
