A new,innovative vibration cast-rolling technology of “electromagnetic stirring+dendrite breaking+asynchronous rolling” was proposed with the adoption of sinusoidal vibration of crystallization roller to prepare Ti/...A new,innovative vibration cast-rolling technology of “electromagnetic stirring+dendrite breaking+asynchronous rolling” was proposed with the adoption of sinusoidal vibration of crystallization roller to prepare Ti/Al laminated composites,and the effect of sinusoidal vibration of crystallization roller on composite microstructure was investigated in detail.The results show that the metallurgical bonding of titanium and aluminum is realized by mesh interweaving and mosaic meshing,instead of transition bonding by forming metal compound layer.The meshing depth between titanium and aluminum layers (6.6μm) of cast-rolling materials with strong vibration of crystallization roller (amplitude 0.87 mm,vibration frequency 25 Hz) is doubled compared with that of traditional cast-rolling materials (3.1μm),and the composite interfacial strength(27.0 N/mm) is twice as high as that of traditional cast-rolling materials (14.9 N/mm).This is because with the action of high-speed superposition of strong tension along the rolling direction,strong pressure along the width direction and rolling force,the composite linearity evolves from "straight line" with traditional casting-rolling to "curved line",and the depth and number of cracks in the interface increases greatly compared with those with traditional cast-rolling,which leads to the deep expansion of the meshing area between interfacial layers and promotes the stable enhancement of composite quality.展开更多
Φ5 mm C70S6非调质钢(/%:0.72C,0.20Si,0.58Mn,0.015P,0.065S,0.12Cr,0.05Ni,0.035V,0.008Al)生产流程为60 t UHP EAF-LF-VD-240 mm×240 mm方坯连铸-轧制。通过对剪切下料时开裂钢棒的组织、断口和剪切工艺进行分析,得出剪切过程...Φ5 mm C70S6非调质钢(/%:0.72C,0.20Si,0.58Mn,0.015P,0.065S,0.12Cr,0.05Ni,0.035V,0.008Al)生产流程为60 t UHP EAF-LF-VD-240 mm×240 mm方坯连铸-轧制。通过对剪切下料时开裂钢棒的组织、断口和剪切工艺进行分析,得出剪切过程开裂钢棒和未开裂钢棒组织、硬度无明显差别,因棒材在剪切过程受剪切力作用,出现水平方向移动,造成平刀和圆刀之间的间隙增大,使棒材剪切面弯曲变形,造成端部开裂。通过安装时将间隙由0.5 mm减少至0.3 mm,棒材夹持力由3 t增至3.5 t,对钢材进行淋水锈蚀处理以增大摩擦力等措施,剪切30 tΦ35 mm C70S6钢材结果表明,剪切开裂率由原10%降为0。展开更多
基金Funded by the Hebei Province Natural Science Foundation (No.E2017203043)National Natural Science Foundation of China(No.U1604251)。
文摘A new,innovative vibration cast-rolling technology of “electromagnetic stirring+dendrite breaking+asynchronous rolling” was proposed with the adoption of sinusoidal vibration of crystallization roller to prepare Ti/Al laminated composites,and the effect of sinusoidal vibration of crystallization roller on composite microstructure was investigated in detail.The results show that the metallurgical bonding of titanium and aluminum is realized by mesh interweaving and mosaic meshing,instead of transition bonding by forming metal compound layer.The meshing depth between titanium and aluminum layers (6.6μm) of cast-rolling materials with strong vibration of crystallization roller (amplitude 0.87 mm,vibration frequency 25 Hz) is doubled compared with that of traditional cast-rolling materials (3.1μm),and the composite interfacial strength(27.0 N/mm) is twice as high as that of traditional cast-rolling materials (14.9 N/mm).This is because with the action of high-speed superposition of strong tension along the rolling direction,strong pressure along the width direction and rolling force,the composite linearity evolves from "straight line" with traditional casting-rolling to "curved line",and the depth and number of cracks in the interface increases greatly compared with those with traditional cast-rolling,which leads to the deep expansion of the meshing area between interfacial layers and promotes the stable enhancement of composite quality.
基金Project(51474189)supported by the National Natural Science Foundation of ChinaProject(QN2015214)supported by the Educational Commission of Hebei Province,China
文摘Φ5 mm C70S6非调质钢(/%:0.72C,0.20Si,0.58Mn,0.015P,0.065S,0.12Cr,0.05Ni,0.035V,0.008Al)生产流程为60 t UHP EAF-LF-VD-240 mm×240 mm方坯连铸-轧制。通过对剪切下料时开裂钢棒的组织、断口和剪切工艺进行分析,得出剪切过程开裂钢棒和未开裂钢棒组织、硬度无明显差别,因棒材在剪切过程受剪切力作用,出现水平方向移动,造成平刀和圆刀之间的间隙增大,使棒材剪切面弯曲变形,造成端部开裂。通过安装时将间隙由0.5 mm减少至0.3 mm,棒材夹持力由3 t增至3.5 t,对钢材进行淋水锈蚀处理以增大摩擦力等措施,剪切30 tΦ35 mm C70S6钢材结果表明,剪切开裂率由原10%降为0。
基金Project(CSTC 2010BB4301) supported by Natural Science Foundation Project of Chongqing,ChinaProject supported by the Open Fund for Key Laboratory of Manufacture and Test Techniques for Automobile Parts of Ministry of Education Chongqing University of Technology,2003,China
