碳含量对600MPa级高强钢中心偏析和带状组织的影响
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摘要
采用金属原位分析仪、直读光谱仪、金相显微镜以及电子探针显微分析仪对三种不同碳含量试验钢的中心偏析和带状组织进行了检验,结果显示,铸坯中心偏析与成品带状组织之间存在较高关联性,其在横截面上的分布不均匀,边部最轻,1/2处次之,1/4处最严重。钢中的碳、磷、硫、铌、钛元素偏析严重,且随着碳含量的增加而恶化。带状组织在横截面上分布不均,检测标准不完善,带状组织评级存在一定局限性。
The center segregation and banded structure of the tested steels with three different carbon contents were investigated by original position analyzer for metal,direct reading spectrometer,optical microscope and electron probe microanalyzer. The results showed that the center segregation in the slab was highly associated with the banded structure in the finished product. The distribution of the center segregation in the cross section is uneven,where 1/4 width of slab shows the greatest segregation,the center is the next,and the edge hasthe slightest level. The carbon,phosphorus,sulfur,niobium and titanium element in the steel seriously segregate in the slab and with the increase of carbon content the segregation becomes worse. The distribution of the banded structure in the cross section is also uneven. The existing standard for inspecting banded structure have certain limitations for the gradation of the banded structure.
The center segregation and banded structure of the tested steels with three different carbon contents were investigated by original position analyzer for metal,direct reading spectrometer,optical microscope and electron probe microanalyzer. The results showed that the center segregation in the slab was highly associated with the banded structure in the finished product. The distribution of the center segregation in the cross section is uneven,where 1/4 width of slab shows the greatest segregation,the center is the next,and the edge hasthe slightest level. The carbon,phosphorus,sulfur,niobium and titanium element in the steel seriously segregate in the slab and with the increase of carbon content the segregation becomes worse. The distribution of the banded structure in the cross section is also uneven. The existing standard for inspecting banded structure have certain limitations for the gradation of the banded structure.
引文
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[18]Zhu Weihua,Wang Lingling.Mechanism of formation of and removal methods of zonal structure in low carbon alloy stee1[J].Lai Steel Technolog,2007(1):21-22.(朱伟华,王玲玲.低碳合金钢中带状组织的形成机理和消减方法[J],莱钢科技,2007(1):21-22.)
[19]Strecken K,Pfennig M,Anelli E,et al.Optimising the structure of high-carbon steel wire[J].EUR,1998(18434):1.
[20]Ji Yuan,Zhang Xiaofeng,Li Pengshan,et al.Central carbon segregation of the billet castings and its heredity to the hot-rolled wire rods[J].Continuous Casting,2016,41(6):24-30.(纪元,张晓峰,李鹏善,等.连铸坯中心碳偏析对其热轧盘条的遗传性[J].连铸,2016,41(6):24-30.)
[21]Zhu Ning.Analysis and discussion of center segregation in continuous casting billet of pipeline steel[J].Modern Metallury,2017,45(1):5-10.(朱宁.管线钢连铸坯中心偏析分析与探讨[J].现代冶金,2017,45(1):5-10.)
[2]Yang Jiantao,Tian Lu,Bao Yanping.Test of slabs center segregation[J].Continuous Casting,2013(4):32-40.(杨建桃,田陆,包燕平.连铸坯中心偏析检测[J].连铸,2013(4):32-40.)
[3]Gui Meiwen,Qin Zhiguang.Improvement in central segrgation of 82B high carbon steel bloom and quality of wire rod[J].Steel Making,2005(3):1.(桂美文,覃之光.82B高碳钢连铸坯中心偏析及线材质量的改善[J].炼钢,2005(3):1.)
[4]Liu Yang,Wang Xinhua,Zhang Kaijun.Influencing factors on center segregation in continuously cast Nb-V-Ti-contained micro-alloying slabs[J].Journal of University of Science and Technology Beijing,2007,29(9):896-900.(刘洋,王新华,张开钧.含铌钒钛微合金化钢连铸板坯中心偏析的影响因素[J].北京科技大学学报,2007,29(9):896-900.)
[5]Yan Chaohong.Applying of soft reduction technique of solidification final stage in continuous cast[J].Bao Steel Technology,2001(5):51.(阎朝红.凝固末端轻压下技术在连铸中的应用[J].宝钢技术,2001(5):51.)
[6]Liu Yang,Wang Xinhua,Wang Wenjun,et al.Study on element microsegregation model at solidifying interface in continuous casting slab of low carbon clean steel[J].Foundry Technology,2011,32(1):49-54.(刘洋,王新华,王文军,等.低碳纯净钢连铸坯凝固前沿元素微观偏析模型的研究[J].铸造技术,2011,32(1):49-54.)
[7]Yang Huixian.Analysis on tension fracture separation of the steel plate for shipbuilding[J].Iron Steel Vanadium Titanium,2016,26(2):144-148.(杨慧贤,船板钢拉伸断口分层原因分析及工艺改进[J].钢铁钒钛,2016,26(2):144-148.)
[8]Tang Haifang,Wang Bao,Zheng Cujun,et al.Reasons analysis on unqualified percentage elongation after fracture of Q345R steel plate[J].PTCA(Part A:Physics Test),2016,52:287-290.(汤海芳,王豹,郑翠军,等.Q345R钢板断后伸长率不合格原因分析[J].理化检验—物理分册,2016,52:287-290.)
[9]Cai Kaike.Quality control of continuous casting billet[M].Beijing:Metallurgical Industry Press,2010.(蔡开科.连铸坯质量控制[M].北京:冶金工业出版社,2010.)
[10]Wang Ping,Huang Zhenyi.Research on microalloying for improving segregation of high-carbon steel in lab[J].China Metallurgy,2007,17(6):23-29.(王萍,黄贞益.微合金化对高碳钢成分偏析影响的实验室研究[J].中国冶金,2007,17(6):23-29.)
[11]Yan Yongqi,Cui Heng,Wang Zheng,et al.Study on center segregations in P-contained high strength IF steel[J].Foundry Technology,2015,36(7):1627-1630.(闫永其,崔衡,王征,等.含磷高强IF钢中心偏析研究[J].铸造技术,2015,36(7):1627-1630.)
[12]Jiang Xinjun,Sheng Pengfei,Yang Jian,et al.Water modeling study on flow field and liquid level fluctuation in 1 600 mm×230mm slab casting mold[J].Continuous Casting,2017,42(1):25-30.(江新军,盛鹏飞,杨建,等.1600 mm×230 mm板坯结晶器流场及液面波动水模拟研究[J].连铸,2017,42(1):25-30.)
[13]Chen Quanwang.The slab caster mold numerical simulation of flow field and temperature field and the structure optimization design[D].Jinan:Shandong University,2013.(陈全旺.板坯连铸机结晶器流场和温度场的数值模拟及结构优化设计[D].济南:山东大学,2013.)
[14]Li Jiao,Wen Guanghua,Zhu Mingmei,et al.Numerical simulation and optimization of flow and temperature fields for wide slab cast mold[J].Journal of Chongqing University,2009,32(2):173-176.(李娇,文光华,祝明妹,等.宽板坯结晶器流场和温度场数值模拟优化分析[J].重庆大学学报,2009,32(2):173-176.)
[15]Hu Qihan.The solidification theory of metal[M].Beijing:China Machine Press,2000.(胡启汉.金属凝固原理[M].北京:机械工业出版社,2000.)
[16]Choudhary S K,Ghost A.Mathematical model for prediction of composition of inclusions formed during solidification of liquid steel[J].ISIJ International,2009,49(12):1819.
[17]Hou Zibing,Cheng Guoguang,Rao Tianrong.Formation mechanism of the centerline segregation of continuous casting slab and soft reduction technology[J].Iron and Steel,2011,6(11):45-49.(侯自兵,成国光,饶添荣.连铸板坯中心线偏析形成机制与轻压下技术[J].钢铁,2011,6(11):45-49.)
[18]Zhu Weihua,Wang Lingling.Mechanism of formation of and removal methods of zonal structure in low carbon alloy stee1[J].Lai Steel Technolog,2007(1):21-22.(朱伟华,王玲玲.低碳合金钢中带状组织的形成机理和消减方法[J],莱钢科技,2007(1):21-22.)
[19]Strecken K,Pfennig M,Anelli E,et al.Optimising the structure of high-carbon steel wire[J].EUR,1998(18434):1.
[20]Ji Yuan,Zhang Xiaofeng,Li Pengshan,et al.Central carbon segregation of the billet castings and its heredity to the hot-rolled wire rods[J].Continuous Casting,2016,41(6):24-30.(纪元,张晓峰,李鹏善,等.连铸坯中心碳偏析对其热轧盘条的遗传性[J].连铸,2016,41(6):24-30.)
[21]Zhu Ning.Analysis and discussion of center segregation in continuous casting billet of pipeline steel[J].Modern Metallury,2017,45(1):5-10.(朱宁.管线钢连铸坯中心偏析分析与探讨[J].现代冶金,2017,45(1):5-10.)
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