热轧工艺对V-N微合金化Q420B大规格角钢组织转变的影响  

Effects of Hot-rolled Process on Microstructure Transformation of V-N Microalloying Q420B Large Size Angle Steel

作　　者：冯运莉 王海蛟 段宝美 张春燕[2] 张海琴[2] FENG Yunli WANG Haijiao DUAN Baomei ZHANG Chunyan ZHANG Haiqin(College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China Technologic Centre, Tangshan Iron and Steel Co., Ltd., Tangshan 063016, China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]唐山钢铁有限公司技术中心,河北唐山063016

出　　处：《热加工工艺》2016年第19期1-5,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51474092);河北省高等学校创新团队领军人才培育计划项目(LJRC007);河北省科技厅资助项目(12212122D);唐山市科技计划资助项目(14110201A)

摘　　要：利用热模拟试验机、扫描电镜研究了热轧工艺参数对V-N微合金化Q420B大规格角钢组织转变的影响规律。结果表明,加热温度由1150℃升高到1300℃时,铁素体平均晶粒尺寸由8.95μm长大到11.64μm,铁素体晶粒粗化了30.1%。开轧温度由950℃升高到1150℃时,铁素体平均晶粒尺寸由5.90μm长大到7.72μm,铁素体晶粒粗化了30.8%。终轧温度由760℃升高到910℃时,铁素体平均晶粒尺寸由5.15μm长大到7.72μm,铁素体晶粒粗化了49.9%。精轧累积压下率由20%升高到50%时,铁素体平均晶粒尺寸由7.91μm细化到4.94μm,铁素体晶粒细化了37.6%。Effects of hot-rolled process parameters on microstructure transformation of V-N microalloying Q420B large size angle steel were investigated by thermal simulation test machine and SEM. The results show that the average grain size of the ferrite grows from 8.95 μm to 11.64μm when heating temperature increases from 1150℃ to 1300℃, and the ferrite grain coarsens by 30.1%. The average grain size of the ferrite grows from 5.90 μm to 7.72 μm when initial rolling temperature increases from 950 ℃ to 1150 ℃, and the ferrite grain coarsens by 30.8%. The average grain size of ferrite grows from 5.15 μm to 7.72 μm when finishing rolling temperature increases from 760 ℃ to 910 ℃, the ferrite grain coarsens by 49.9%. And when finishing rolling accumulated reduction ratio increases from 20% to 50%, the average grain size of the ferrite decreases from 7.91 μm to 4.94 μm, the ferrite grain refines by 37.6%.

关 键 词：V-N微合金化 Q420B大规格角钢 热轧工艺 组织 

分 类 号：TG335.41[金属学及工艺—金属压力加工]