EH47钢连铸坯热芯大压下轧制应变诱导析出行为
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摘要
研究了EH47微合金钢连铸坯经传统轧制和热芯大压下轧制后室温下的组织和析出相形貌,并采用MMS-200热模拟双道次压缩实验研究了其经热芯大压下轧制后的第二相粒子应变诱导析出行为。结果表明:热芯大压下轧制后EH47微合金钢连铸坯的芯部铁素体尺寸较传统轧制的芯部铁素体尺寸明显减小;热模拟双道次压缩实验表明,热芯大压下轧制后,EH47微合金钢的应变诱导析出第二相粒子在位错、晶界、亚晶界上沉淀析出,在一定程度上起到钉扎晶界并阻碍再结晶晶粒长大的作用。
Microstructure and precipitated phase morphology of EH47 microalloyed steel continuous casting slab after conventional rolling and hot-core heavy reduction rolling at room temperature were studied, and strain-induced precipitation behavior of second phase particle of the EH47 microalloyed steel continuous casting slab after hot-core heavy reduction rolling was studied by MMS-200 thermal simulation two-stage interrupted compression experiment. The results show that the ferrite size in the center of the EH47 microalloyed steel continuous casting slab after hot-core heavy reduction rolling is obviously smaller than that of after conventional rolling. The results of two-stage interrupted compression test show that the second phase particles of strain-induced precipitation of the EH47 microalloyed steel continuous casting slab precipitate at dislocation, grain boundary and sub-grain boundary after hot-core heavy reduction rolling, which can pinning the grain boundary and hindering the recrystallization grain growth.
Microstructure and precipitated phase morphology of EH47 microalloyed steel continuous casting slab after conventional rolling and hot-core heavy reduction rolling at room temperature were studied, and strain-induced precipitation behavior of second phase particle of the EH47 microalloyed steel continuous casting slab after hot-core heavy reduction rolling was studied by MMS-200 thermal simulation two-stage interrupted compression experiment. The results show that the ferrite size in the center of the EH47 microalloyed steel continuous casting slab after hot-core heavy reduction rolling is obviously smaller than that of after conventional rolling. The results of two-stage interrupted compression test show that the second phase particles of strain-induced precipitation of the EH47 microalloyed steel continuous casting slab precipitate at dislocation, grain boundary and sub-grain boundary after hot-core heavy reduction rolling, which can pinning the grain boundary and hindering the recrystallization grain growth.
引文
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[2] Won Y,Thomas B G.Simple model of microsegregation during solidification of steels[J].Metallurgical and Materials Transactions A,2001,32A:1755-1767.
[3] Luo S,Zhu M Y,Ji C,et al.Characteristics of solute segregation in continuous casting bloom with dynamic soft reduction and determination of soft reduction zone[J].Ironmaking and Steelmaking,2010,37(2):140-146.
[4] Araki K,Kohriyama T,Nakamura M.Development of heavy section steel plates with improved internal properties through forging and plate rolling process using continuous casting slabs[J].Kawasaki Steel Tech Rep,1999,40:80-83.
[5] Nabeshima S,Nakato H,Fujii T,et al.Control of center line segregation in continously cast blooms by continouous forging process[J].ISIJ International,1995,35:673-679.
[6] Zhang T,Wang B X,Wang Z D,et al.Side-surface shape optimization of heavy plate by large temperature gradient rolling[J].ISIJ International,2016,56:179-183.
[7] Ding J G,Zhao Z,Jiao Z J,et al.Central infiltrated performance of deformation in ultra-heavy plate rolling with large deformation resistance gradient[J].Applied Thermal Engineering,2016,98:29-38.
[8] Dong Q P,Zhang J M,Wang B,et al.Shrinkage porosity and its alleviation by heavy reduction in continuously cast strand[J].Journal of Materials Processing Technology,2016,238:81-88.
[9] Yu W,Li G S,Cai Q W.Effect of a novel gradient temperature rolling process on deformation,microstructure and mechanical properties of ultra-heavy plate[J].Journal of Materials Processing Technology,2015,217:317-326.
[10] Zhao X K,Zhang J M,Lei S W,et al.The position study of heavy reduction process for improving centerline segregation or porosity with extra-thickness slabs[J].Steel Research International,2014,85(4):645-658.
[11] Dutta B,Valdes E,Sellars C M.Mechanism and kinetics of strain induced precipitation of Nb(C,N) in austenite[J].Acta Meterialia,1992,40(4):653-662.
[12] Liu Z K.Thermodynamic calculations of carbonitrides in microalloyed steels[J].Scripta Materialia,2004,50(5):601-606.
[13] 周晓光,刘振宇,吴迪,等.FTSR热轧含Nb钢动态再结晶数学模型中参数的确定[J].金属学报,2008,44(10):1188-1192.ZHOU Xiao-guang,LIU Zhen-yu,WU Di,et al.Determination of model parameters of dynamic recrystallization for Nb bearing steels during flexible thin slab rolling[J].Acta Metallurgical Sinica,2008,44(10):1188-1192.
[14] 李龙飞,杨王玥,孙祖庆.Mn含量对低碳钢中铁素体动态再结晶的影响[J].金属学报,2004,40(12):1257-1263.LI Long-fei,YANG Wang-yue,SUN Zu-qing.Influence of Mn content on dynamic recrystallization of ferrite in low carbon steels[J].Acta Metallurgical Sinica,2004,40(12):1257-1263.
[15] Liu W J,Jonas J J.Nucleation kinetics of Ti carbonitride in microalloyed austenite[J].Metallurgical and Materials Transactions A,1989,20(4):689-697.
[16] 陈礼清,赵阳,徐香秋,等.一种低碳钒微合金钢的动态再结晶与析出行为[J].金属学报,2010,46(10):1215-1222.CHEN Li-qing,ZHAO Yang,XU Xiang-qiu,et al.Dynamic recrystallization and precipitation behaviors of a kind of low carbon V-microalloyed steel[J].Acta Metallurgical Sinica,2010(10),46:1215-1222.
[17] 崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2008.
[18] 杨财水,罗许,康永林,等.Q345B 低锰钛微合金化钢的静态再结晶行为[J].金属热处理,2015,40(3):30-33.YANG Cai-shui,LUO Xu,KANG Yong-lin,et al.Static recrystallization behavior of low manganese and titanium microalloyed Q345B steel[J].Heat Treatment of Metals,2015,40(3):30-33.
[19] 蔺永诚,陈明松,钟掘,42CrMo 钢形变奥氏体的静态再结晶[J].中南大学学报 (自然科学版),2009,40(2),411-416.LIN Yong-cheng,CHEN Ming-song,ZHONG Jue.Static recrystallization behaviors of deformed 42CrMo steel[J].Journal of Central South University (Science and Technology),2009,40(2):411-416.
[20] 陈俊,周砚磊,唐帅,等.Nb-Ti微合金钢的静态再结晶行为[J].钢铁,2012,47(5):54-58.CHEN Jun,ZHOU Yan-lei,TANG Shuai,et al.Static recrystallization behavior of Nb-Ti microalloyed steel[J] Iron and steel,2012,47(5):54-58.
[21] 鲍思前,周瑾,叶恭琦,等,含Nb微合金钢Q345E静态再结晶行为研究[J].热加工工艺,2015,44(4):82-89.BAO Si-qian,ZHOU Jin,YE Gong-qi,et al.Study on static recrystallization of Nb-microalloyed steel Q345E[J].Hot Working Technology,2015,44(4):82-89.
[22] Chen J,Tang S,Liu Z Y,et al.Strain-induced precipitation kinetics of Nb(C,N) and precipitates evolution in austenite of Nb-Ti micro-alloyed steels[J].Journal of Materials Science,2012,47:4640-4648.