摘要
不锈钢/碳钢复合板既发挥了不锈钢的强耐腐蚀性、高耐磨性、高耐热性和高磁性,又结合了碳钢的易焊接性、高导热性和易延展性等优势。然而,不锈钢/碳钢复合板较低的结合强度严重限制了其广泛的应用。提出采用纵波轧制(LCR)制备不锈钢/碳钢复合板的工艺,从试验和有限元模拟2个方面研究了变形过程中搓轧区对复合板结合强度的影响,并与平辊轧制(FR)工艺进行对比。结果表明,LCR复合板在波峰和波谷处的拉剪强度分别为315.94 MPa和329.48 MPa, FR复合板的拉剪强度为277.77 MPa。波峰和波谷处的拉剪强度较FR复合板分别提升了13.7%和18.6%。通过对拉剪断裂面进行元素扫描分析发现,LCR复合板波峰和波谷的断裂位置处于Q235B基体中,FR复合板的断裂位置在结合界面上。LCR复合板的拉伸强度和断后伸长率均优于FR复合板。利用有限元模拟获得LCR和FR变形区复合板的应力状态分布,LCR变形区中部分金属处于两向压应力和一向拉应力状态,应力状态更接近纯剪状态,LCR复合板在轧制过程中受到拉应力和强烈的剪应力共同作用。与FR变形区不同,LCR变形区由于波纹辊型的影响,在轧制方向和宽度方向上均存在搓轧区。搓轧区增强不同金属之间的剪切作用,有利于金属表面氧化层和硬化层的破碎,从而促进2种金属的相互结合,提高复合板的结合强度。
Stainless steel/carbon steel clad plate not only possesses the strong corrosion resistance,high wear resistance,high heat resistance and high magnetism of stainless steel,but also combines the easy weldability,high thermal conductivity and easy ductility of carbon steel.However,the low bonding strength of stainless steel/carbon steel clad plate severely limits its wide application.In this paper,the technology of preparing stainless steel/carbon steel clad plate by longitudinal corrugated rolling(LCR)is presented.The effect of cross shear zone on bonding strength of clad plate is studied in deformation zone by experiment and finite element model(FEM)compared with flat rolling(FR)process.The results show that the tensile shear strengths of LCR clad plate at the peak and trough are 315.94 MPa and 329.48 MPa,respectively,and that of FR clad plate is 277.77 MPa.The tensile shear strengths of the peak and trough are 13.7%and 18.6%higher than that of FR clad plate,respectively.Through the element scanning analysis of the tensile shear fracture surface,the results show that the fracture position of the peak and trough of LCR clad plate is at the Q235Bmatrix,and the fracture position of FR clad plate is at the bond ing interface.The tensile strength and elongation of LCR clad plate are better than FR clad plate.The stress state distributions of LCR and FR clad plates are obtained by FEM.Some metals are in the state of two compressive stresses and one tensile stress in the LCR deformation zone,and the stress state is closer to the pure shear state.The LCR clad plate is subjected to the action of tensile stress and strong shear stress in the rolling process.Different from FR deformation zone,there are cross shear zones in rolling and transverse directions due to the influence of corrugation roll shape in the LCR deformation zone.The existence of cross shear zones can enhance the shear effect between dissimilar metals,which is conducive to the cracking of the oxidized and hardened layers,promotes the combination of clad plate,and improves the bonding strength of the clad plate.
作者
李亚新
刘元铭
王振华
张明泽
张博文
王涛
LI Yaxin;LIU Yuanming;WANG Zhenhua;ZHANG Mingze;ZHANG Bowen;WANG Tao(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;National Key Laboratory of Metal Forming Technology and Heavy Equipment,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
出处
《钢铁》
CAS
CSCD
北大核心
2023年第8期138-148,共11页
Iron and Steel
基金
国家重点研发计划资助项目(2021YFB3401000,2018YFA0707300)
国家自然科学基金资助项目(51904206,52105390,51905372,52205404)
国家级大学生创新训练计划资助项目(202210112021)。
关键词
纵波轧制
不锈钢/碳钢复合板
力学性能
有限元模拟
搓轧区
longitudinal corrugated rolling
stainless steel/carbon steel clad plate
mechanical property
finite element simulation
cross shear zone
作者简介
李亚新(1996-),男,硕士生,E-mail:liyaxin130722@163.com;通信作者:刘元铭(1988-),男,博士,副教授,E-mail:liuyuanming@tyut.edu.cn。
