微合金钢连铸坯表面裂纹敏感性预测模型
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摘要
为了从凝固及相变特性角度解决微合金钢连铸坯表面裂纹问题,建立了与合金化相关联的初始凝固包晶反应度模型、奥氏体晶粒长大模型、铁素体转变量模型以及碳氮化物的析出模型。结合铸坯实际冷却条件,进一步建立了包晶反应度预测、初生奥氏体晶粒长大、铁素体转变、析出相析出等对铸坯表面裂纹敏感性的预测模型。针对某J55钢连铸板坯,奥氏体晶粒尺寸超过1mm、铁素体析出量为10%、二次相析出量增加时,横裂纹敏感性最大。表面裂纹敏感性预测模型有助于实现基于成分微调和组织调控的微合金钢连铸、热装等生产过程表面裂纹控制技术。
In order to solve the surface cracking defects of micro-alloyed steel casting slab from solidification and phase transformation aspects.The models of peritectic reaction,austenite grain growth,ferrite transformation and carbonitride precipitation during the initial solidification of micro-alloyed steels were established.The prediction model of slab surface cracking sensitivity related to the peritectic reaction degree,primary austenite grain growth,transformation of austenite to ferrite and carbonitride precipitation were further established combined with the real cooling conditions.For J55 steel,the surface transverse cracking sensitivity would reach the peak on the condition of the austenite grain large than 1 mm,the ferrite precipitation content of 10%and the increase of the continuous carbonitrides precipitation.The cracking sensitivity prediction model was helpful to realize the surface cracking control during the continuous casting and hot charging processes of the micro-alloyed steel based on the micro-adjustment of composition and structure.
In order to solve the surface cracking defects of micro-alloyed steel casting slab from solidification and phase transformation aspects.The models of peritectic reaction,austenite grain growth,ferrite transformation and carbonitride precipitation during the initial solidification of micro-alloyed steels were established.The prediction model of slab surface cracking sensitivity related to the peritectic reaction degree,primary austenite grain growth,transformation of austenite to ferrite and carbonitride precipitation were further established combined with the real cooling conditions.For J55 steel,the surface transverse cracking sensitivity would reach the peak on the condition of the austenite grain large than 1 mm,the ferrite precipitation content of 10%and the increase of the continuous carbonitrides precipitation.The cracking sensitivity prediction model was helpful to realize the surface cracking control during the continuous casting and hot charging processes of the micro-alloyed steel based on the micro-adjustment of composition and structure.
引文
[1]刘志远,王重君,蔡兆镇,等.含铌微合金钢连铸坯角部裂纹控制二冷新工艺[J].中国冶金,2018,28(3):22.
[2]杨忠民,王凯,孙秀,等.铌钛微合金钢铸坯晶界铁素体形貌与晶界裂纹[J].钢铁,2018,53(11):70.
[3]兰鹏,杜辰伟,陈培莉,等.微合金钢连铸表面横裂纹形成机理与控制技术研究现状[J].钢铁研究学报,2017,29(1):1.
[4]Pudar M,Zamberger S,Spiradek-Hahn K,et al.Computational analysis of precipitation during continuous casting of microalloyed steel[J].Steel Research International,2010,81(5):372.
[5]Chimani C M,Resch H,M9rwald K,et al.Precipitation and phase transformation modelling to predict surface cracks and slab quality[J].Ironmaking and Steelmaking,2005,32(1):75.
[6]Krajewski P,Krobath R,Bernhard C,et al.A novel approach for the simulation of surface cracks formation in continuous casting[C]//Proc.8th European Continuous Casting Conf.Graz:ASMET,2014:1160.
[7]杜辰伟,李聿军,张家泉.连铸二次冷却的研究现状,进展及将来[G]//蔡开科教授纪念文集.北京:冶金工业出版社,2015:303.
[8]杜辰伟,汪春雷,李波,等.拉坯方向铸坯温度场和冷速分布对微合金钢表面横裂纹的影响[J].钢铁研究学报,2018,30(7):523.
[9]李阳,王京,兰鹏,等.合金元素对钢亚包晶转变与连铸纵裂倾向的影响[J].钢铁,2013,48(12):73.
[10]杜辰伟,兰鹏,李杨,等.J55钢连铸板坯凝固与固态相变调控热力学分析[J].连铸,2017,42(1):64.
[11]杜辰伟,陆珏钰,兰鹏,等.奥氏体晶粒度对钢坯铸态热塑性及相变的影响[J].材料热处理学报,2016,37(10):146.
[12]李云峰.微合金钢连铸坯表层原始奥氏体晶粒的细化研究[D].重庆:重庆大学,2014.
[13]Bernhard C,Reiter J,Presslinger H.A model for predicting the austenite grain size at the surface of continuously-cast slabs[J].Metallurgical and Materials Transactions B,2008,39(6):885.
[14]李波,汪春雷,李斌,等.铁素体析出量对铸坯热塑性的影响[J].江西冶金,2018,38(2):1.
[15]LIU H,DU C W,LAN P,et al.Simultaneous formation of inter-and intragranular ferrite in microalloyed steels studied by modeling and experiment[J].Metallurgical Research and Technology,2017,114(1):401.
[16]张小欢,刘珂,李阳,等.碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用[J].特殊钢,2011,32(3):40.
[17]Xia G,Burgstaller K,Fürst C,et al.Influence of steel composition on crack formation on the continuous casting steel slab[C]//Proc.8th European Continuous Casting Conf.Graz:AS-MET,2014:729.
[18]Louhenkilpi S,Kyt9nen H,Santis M D,et al.Integrated models for defect free casting(Deffree)[J].EUR,Research fund for Coal and Steel,2013:84.
[2]杨忠民,王凯,孙秀,等.铌钛微合金钢铸坯晶界铁素体形貌与晶界裂纹[J].钢铁,2018,53(11):70.
[3]兰鹏,杜辰伟,陈培莉,等.微合金钢连铸表面横裂纹形成机理与控制技术研究现状[J].钢铁研究学报,2017,29(1):1.
[4]Pudar M,Zamberger S,Spiradek-Hahn K,et al.Computational analysis of precipitation during continuous casting of microalloyed steel[J].Steel Research International,2010,81(5):372.
[5]Chimani C M,Resch H,M9rwald K,et al.Precipitation and phase transformation modelling to predict surface cracks and slab quality[J].Ironmaking and Steelmaking,2005,32(1):75.
[6]Krajewski P,Krobath R,Bernhard C,et al.A novel approach for the simulation of surface cracks formation in continuous casting[C]//Proc.8th European Continuous Casting Conf.Graz:ASMET,2014:1160.
[7]杜辰伟,李聿军,张家泉.连铸二次冷却的研究现状,进展及将来[G]//蔡开科教授纪念文集.北京:冶金工业出版社,2015:303.
[8]杜辰伟,汪春雷,李波,等.拉坯方向铸坯温度场和冷速分布对微合金钢表面横裂纹的影响[J].钢铁研究学报,2018,30(7):523.
[9]李阳,王京,兰鹏,等.合金元素对钢亚包晶转变与连铸纵裂倾向的影响[J].钢铁,2013,48(12):73.
[10]杜辰伟,兰鹏,李杨,等.J55钢连铸板坯凝固与固态相变调控热力学分析[J].连铸,2017,42(1):64.
[11]杜辰伟,陆珏钰,兰鹏,等.奥氏体晶粒度对钢坯铸态热塑性及相变的影响[J].材料热处理学报,2016,37(10):146.
[12]李云峰.微合金钢连铸坯表层原始奥氏体晶粒的细化研究[D].重庆:重庆大学,2014.
[13]Bernhard C,Reiter J,Presslinger H.A model for predicting the austenite grain size at the surface of continuously-cast slabs[J].Metallurgical and Materials Transactions B,2008,39(6):885.
[14]李波,汪春雷,李斌,等.铁素体析出量对铸坯热塑性的影响[J].江西冶金,2018,38(2):1.
[15]LIU H,DU C W,LAN P,et al.Simultaneous formation of inter-and intragranular ferrite in microalloyed steels studied by modeling and experiment[J].Metallurgical Research and Technology,2017,114(1):401.
[16]张小欢,刘珂,李阳,等.碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用[J].特殊钢,2011,32(3):40.
[17]Xia G,Burgstaller K,Fürst C,et al.Influence of steel composition on crack formation on the continuous casting steel slab[C]//Proc.8th European Continuous Casting Conf.Graz:AS-MET,2014:729.
[18]Louhenkilpi S,Kyt9nen H,Santis M D,et al.Integrated models for defect free casting(Deffree)[J].EUR,Research fund for Coal and Steel,2013:84.