板坯加热工艺对厚规格管线钢组织性能的影响
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摘要
为了改善厚规格管线钢的强韧性,采用实验室物理模拟及轧制试验和SEM、EBSD分析方法,研究了试验钢的奥氏体粗化特性及板坯再加热工艺对30 mm规格管线钢组织性能的影响规律,并分析了强韧化机理。结果表明,随着试验板坯加热温度的上升,试验钢初始奥氏体晶粒呈粗化趋势,试验钢的显微组织由细化的铁素体为主的组织向贝氏体为主的组织转变,钢板强度呈上升趋势,夏比冲击功、DWTT(drop weigh tear test,落锤撕裂试验)性能呈下降趋势;低温加热时,随着保温时间增加,细化贝氏体比例上升,夏比冲击功呈上升趋势,强度、DWTT性能变化不大;高温加热时,随着保温时间增加,夏比冲击功呈下降趋势,强度、DWTT性能变化不大。EBSD分析表明,晶粒粗化显著降低夏比冲击韧性,增加大角度晶界比例有利于提升DWTT性能。
In order to improve strength and toughness for heavy gauge pipeline steel,by using the way of physical simulation,pilot rolling and SEM,EBSD analysis,the coarsenning characteristics,the effect of slab reheating parameters on mechanical properties and microstructure were studied for 30 mm X65 pipeline steel,emphasized on the analysis of the strengthening and toughening mechanisms. The results show that,with increasing the reheating temperature,the initial austenite grain size tends to coarse and the microstructure of trial steel changed from the fine ferrite to bainite dominated,which induce higher strength and lower charpy impact energy and DWTT shear area ratio. With increasing the soak time,there is no obvious change for strength,DWTT shear area and microstructure,however,the chary impact energy increase for high reheating temperature while decrease for low reheating temperature. EBSD analysis shows that the grain coarsening reduces the charpy impact energy,and increasing the proportion of high-angle grain boundary promotes the DWTT performance.
In order to improve strength and toughness for heavy gauge pipeline steel,by using the way of physical simulation,pilot rolling and SEM,EBSD analysis,the coarsenning characteristics,the effect of slab reheating parameters on mechanical properties and microstructure were studied for 30 mm X65 pipeline steel,emphasized on the analysis of the strengthening and toughening mechanisms. The results show that,with increasing the reheating temperature,the initial austenite grain size tends to coarse and the microstructure of trial steel changed from the fine ferrite to bainite dominated,which induce higher strength and lower charpy impact energy and DWTT shear area ratio. With increasing the soak time,there is no obvious change for strength,DWTT shear area and microstructure,however,the chary impact energy increase for high reheating temperature while decrease for low reheating temperature. EBSD analysis shows that the grain coarsening reduces the charpy impact energy,and increasing the proportion of high-angle grain boundary promotes the DWTT performance.
引文
[1]郑磊,傅俊岩.高等级管线钢的发展[J].钢铁,2006,41(10):1.(ZHENG Lei,FU Jun-yan.Recent development of high performance pipeline steel[J].Iron and Steel,2006,41(10):1.)
[2]徐景涛.X80管线钢在长输管道中的应用及展望[J].中国冶金,2016,26(8):1.(XU Jing-tao.Application and prospect of X80 steel in long-distance pipeline[J].China Metallurgy,2016,26(8):1.)
[3]郑磊,高珊,章传国,等.西气东输二线用高Nb X80级管线钢宽厚板的开发[J].焊管,2009,32(4):25.(ZHENG Lei,GAO Shan,ZHANG Chuan-guo,et al.Development of high Nb X80grade pipeline steel wide-thick plate used in the second west to east gas pipeline project[J].Welded Pipe,2009,32(4):25.)
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[7]孙磊磊,柏明卓,郑磊.两阶段冷却工艺对基于应变设计X70管线钢组织的影响[J].钢铁,2014,49(9):81.(SUN Lei-lei,BAI Ming-zhuo,ZHENG Lei.Influences of two-stage cooling processes on microstructure of strain-based designed X70 pipeline steel[J].Iron and Steel,2014,49(9):81.)
[8]肖宝亮,许云波,董毅,等.“高温大变形+超快冷”工艺在管线钢生产中的应用[J].钢铁,2010,45(6):49.(XIAO Bao-liang,XU Yun-bo,DONG Yi,et al.Application of large deformation at high temperature and ultra fast cooling process in production of pipeline steel[J].Iron and Steel,2010,45(6):49.)
[9]骆宗安,陈晓峰,谢广明,等.真空轧制825合金/X65钢复合板的组织性能[J].钢铁,2017,52(3):64.(LUO Zong-an,CHEN Xiao-feng,XIE Guang-ming,et al.Microstructure and mechanical property of vacuum hot-rolled 825 alloy/X65 pipeline steel clad plate[J].Iron and Steel,2017,52(3):64.)
[10]宋佳友,单庆林,景财良,等.X65MS管线钢中心偏析改善的实践[J].中国冶金,2016,26(8):64.(SONG Jia-you,SHAN Qing-lin,JING Cai-liang,et al.Improvement on central segregation of pipeline steel X65MS[J].China Metallurgy,2016,26(8):64.)
[11]王志勇,李少坡,李群,等.经济型X80管线钢的研制开发[J].中国冶金,2016,26(11):64.(WANG Zhi-yong,LI Shao-po,LI Qun,et al.Research and development of low-cost X80 pipeline steel[J].China Metallurgy,2016,26(11):64.)
[12]章传国,郑磊.轧后加热温度对高Nb X80管线钢板组织性能的影响[J].钢铁,2013,48(1):82.(ZHANG Chuan-guo,ZHENG Lei.Effect of heating temperature after TMCP on microstructure and mechanical properties for X80 steel plate with high Nb content[J].Iron and Steel,2013,48(1):82.)
[13]张清清,章传国,郑磊.T8/5时间对X80管线钢热影响区组织和韧性的影响[J].中国冶金,2017,27(4):26.(ZHANG Qingqing,ZHANG Chuan-guo,ZHENG Lei.Effect of T8/5time on microstructure and toughness in heat affected zone of X80 pipeline steel[J].China Metallurgy,2017,27(4):26.)
[14]陈宏达,霍春勇,冯耀荣,等.管线钢落锤撕裂试验方法的建立、应用及发展[J].钢铁研究学报,2005,17(6):1.(CHEN Hong-da,HUO Chun-yong,FENG Yao-rong,et al.Establishment application and development of DWTT method for pipeline steel[J].Journal of Iron and Steel Research,2005,17(6):1.)
[15]高珊,郑磊.不同微观组织高强度管线钢冲击韧性的研究[J].宝钢技术,2004(6):26.(GAO Shan,ZHENG Lei.Study on impact toughness for high strength pipeline steel with different microstructures[J].Baosteel Technology,2004(6):26.)
[16]贾书君,刘清友,李拔.厚壁X70管线钢的组织和性能[J].材料热处理学报,2016,37(4):129.(JIA Shu-jun,LIU Qing-you,LI Ba.Microstructure and mechanical properties of thick wall X70 pipeline steel[J].Transactions of Materials and Heat Treatment,2016,37(4):129.)
[17]张寿禄,赵泳仙,崔天燮,等.应用EBSD研究X80管线钢的落锤撕裂性能[J].中国体视学与图像分析,2007,12(4):271.(ZHANG Shou-lu,ZHAO Yong-xian,CUI Tian-xie,et al.The DWTT performance of X80 pipeline steel analyzed by EBSD technique[J].Chinese Journal of Stereology and Image Analysis,2007,12(4):271.)
[2]徐景涛.X80管线钢在长输管道中的应用及展望[J].中国冶金,2016,26(8):1.(XU Jing-tao.Application and prospect of X80 steel in long-distance pipeline[J].China Metallurgy,2016,26(8):1.)
[3]郑磊,高珊,章传国,等.西气东输二线用高Nb X80级管线钢宽厚板的开发[J].焊管,2009,32(4):25.(ZHENG Lei,GAO Shan,ZHANG Chuan-guo,et al.Development of high Nb X80grade pipeline steel wide-thick plate used in the second west to east gas pipeline project[J].Welded Pipe,2009,32(4):25.)
[4]章传国,郑磊,孙磊磊,等.精轧压下比对厚规格管线钢DWTT性能的影响[C]//第十届钢铁年会暨第六届宝钢学术年会论文集.上海:中国金属学会,2015:6.(ZHANG Chuanguo,ZHENG Lei,SUN Lei-lei,et al.Effect of transfer bar ratio on DWTT performance for heavy gauge pipeline steel[C]//Proceedings of the 10thCSM Steel Congress and the 6thBaosteel Biennial Academic Conference.Shanghai:Metallurgical Industry Press,2015:6.)
[5]Speer J G,Hansen S S.Austenite recrystallization and carbonitride precipitation in niobium microalloyed steels[J].Metallurgical Transactions:A,1989,20:25.
[6]曲锦波,单以银,赵明纯,等.加速冷却对控轧管线钢组织和性能的影响[J].钢铁,2001,31(9):46.(QU Jin-bo,SHAN Yiyin,ZHAO Ming-chun,et al.Effect of accelerate cooling on microstructure and microstructure of controlled rolled pipeline steels[J].Iron and Steel,2001,31(9):46.)
[7]孙磊磊,柏明卓,郑磊.两阶段冷却工艺对基于应变设计X70管线钢组织的影响[J].钢铁,2014,49(9):81.(SUN Lei-lei,BAI Ming-zhuo,ZHENG Lei.Influences of two-stage cooling processes on microstructure of strain-based designed X70 pipeline steel[J].Iron and Steel,2014,49(9):81.)
[8]肖宝亮,许云波,董毅,等.“高温大变形+超快冷”工艺在管线钢生产中的应用[J].钢铁,2010,45(6):49.(XIAO Bao-liang,XU Yun-bo,DONG Yi,et al.Application of large deformation at high temperature and ultra fast cooling process in production of pipeline steel[J].Iron and Steel,2010,45(6):49.)
[9]骆宗安,陈晓峰,谢广明,等.真空轧制825合金/X65钢复合板的组织性能[J].钢铁,2017,52(3):64.(LUO Zong-an,CHEN Xiao-feng,XIE Guang-ming,et al.Microstructure and mechanical property of vacuum hot-rolled 825 alloy/X65 pipeline steel clad plate[J].Iron and Steel,2017,52(3):64.)
[10]宋佳友,单庆林,景财良,等.X65MS管线钢中心偏析改善的实践[J].中国冶金,2016,26(8):64.(SONG Jia-you,SHAN Qing-lin,JING Cai-liang,et al.Improvement on central segregation of pipeline steel X65MS[J].China Metallurgy,2016,26(8):64.)
[11]王志勇,李少坡,李群,等.经济型X80管线钢的研制开发[J].中国冶金,2016,26(11):64.(WANG Zhi-yong,LI Shao-po,LI Qun,et al.Research and development of low-cost X80 pipeline steel[J].China Metallurgy,2016,26(11):64.)
[12]章传国,郑磊.轧后加热温度对高Nb X80管线钢板组织性能的影响[J].钢铁,2013,48(1):82.(ZHANG Chuan-guo,ZHENG Lei.Effect of heating temperature after TMCP on microstructure and mechanical properties for X80 steel plate with high Nb content[J].Iron and Steel,2013,48(1):82.)
[13]张清清,章传国,郑磊.T8/5时间对X80管线钢热影响区组织和韧性的影响[J].中国冶金,2017,27(4):26.(ZHANG Qingqing,ZHANG Chuan-guo,ZHENG Lei.Effect of T8/5time on microstructure and toughness in heat affected zone of X80 pipeline steel[J].China Metallurgy,2017,27(4):26.)
[14]陈宏达,霍春勇,冯耀荣,等.管线钢落锤撕裂试验方法的建立、应用及发展[J].钢铁研究学报,2005,17(6):1.(CHEN Hong-da,HUO Chun-yong,FENG Yao-rong,et al.Establishment application and development of DWTT method for pipeline steel[J].Journal of Iron and Steel Research,2005,17(6):1.)
[15]高珊,郑磊.不同微观组织高强度管线钢冲击韧性的研究[J].宝钢技术,2004(6):26.(GAO Shan,ZHENG Lei.Study on impact toughness for high strength pipeline steel with different microstructures[J].Baosteel Technology,2004(6):26.)
[16]贾书君,刘清友,李拔.厚壁X70管线钢的组织和性能[J].材料热处理学报,2016,37(4):129.(JIA Shu-jun,LIU Qing-you,LI Ba.Microstructure and mechanical properties of thick wall X70 pipeline steel[J].Transactions of Materials and Heat Treatment,2016,37(4):129.)
[17]张寿禄,赵泳仙,崔天燮,等.应用EBSD研究X80管线钢的落锤撕裂性能[J].中国体视学与图像分析,2007,12(4):271.(ZHANG Shou-lu,ZHAO Yong-xian,CUI Tian-xie,et al.The DWTT performance of X80 pipeline steel analyzed by EBSD technique[J].Chinese Journal of Stereology and Image Analysis,2007,12(4):271.)