熔体压力对水平双辊铸轧Ti/Al复合板界面结合强度的影响  

Effect of melt pressure on interfacial bonding strength of horizontal twin-roll casting Ti/Al composite plate

作　　者：许久健 张焘 付金禹 许光明[1] 李勇[2,3] 王昭东 XU Jiujian;ZHANG Tao;FU Jinyu;XU Guangming;LI Yong;WANG Zhaodong(Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Guangxi Advanced Aluminum Processing Innovation Center Co.,Ltd.,Nanning 530007,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819 [2]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [3]广西先进铝加工创新中心有限责任公司,南宁530007

出　　处：《材料工程》2024年第7期182-193,共12页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51790485);山东省重点研发计划项目(2019JZZY010401);南宁市科技重大专项项目(20201041)。

摘　　要：除了铸轧速度和熔体浇铸温度外,铸轧区内的熔体压力也是影响水平双辊铸轧Ti/Al复合板工艺稳定性和界面结合强度的重要因素。本工作在铸轧复合过程中通过调节前箱内熔体的液面高度,获得了在不同铸轧区熔体压力下制备的Ti/Al复合板。通过金相、扫描电镜、显微硬度、室温拉伸实验、T型剥离实验等手段对复合板的显微组织和界面结合性能进行表征和测试。结果表明,当熔体压力较高时,可以生产出充盈饱满、板型良好、结合强度高的复合板,但熔体压力过高会影响铸轧复合过程的稳定性。当熔体压力过低时,熔体的横向流动能力减弱,铸轧区内不能完全被熔体填充满,板材出现热带、褶皱等缺陷,同时,在Ti/Al上出现了部分微孔和微裂缝。在较高熔体压力下,固/液接触距离更长,带材表面与熔体的润湿更加充分,熔体分布更加均匀,固/液扩散更加充分。因此,当熔体压力较高时,复合板具有更高的结合强度,界面结合强度达到20.1 N/mm。Besides cast-rolling speed and casting temperature,the melt pressure in the cast-rolling zone is also an important factor affecting the process stability and interfacial bonding strength of horizontal two-roll cast Ti/Al composite plate.In this study,several Ti/Al composite plates were prepared under different melt pressures in the cast-rolling zone by adjusting the liquid level of the melt in the sluice during the castrolling composite process.The microstructure and interfacial bonding properties of the composite plates were characterized by metallography,scanning electron microscopy,microhardness,tensile test and Ttype peeling test at room temperature.Results show that when the melt pressure is relatively high,composite plate with full filling,good plate shape and high bonding strength can be produced successfully.However,excessively high melt pressure will affect the stability of the cast-rolling composite process.When the melt pressure is too low,the transverse flow capacity of the melt decreases.As a result,the cast-rolling zone cannot be completely filled with the melt,and the defects such as misrun and side penetration occur.At the same time,some micropores and microcracks appear on the Ti/Al interface.Under relatively high melt pressure,the solid/liquid contact distance is long.In this condition,the wetting between the strip surface and the melt is more sufficient,the melt is more evenly distributed,and the diffusion between solid and liquid is more sufficient.As a result,the composite plate has high bonding strength,which reaches 20.1 N/mm.

关 键 词：铸轧复合 钛/铝复合板 熔体压力 界面结合强度 

分 类 号：TB331[一般工业技术—材料科学与工程]