Microstructural characterization of blanked surface of C5191 phosphor bronze sheet under ultra-high-speed blanking  

C5191磷青铜薄板超高速冲裁断面的显微组织特征

作　　者：Dao-chun HU Ming-he CHEN Lei WANG Hong-jun WANG 胡道春;陈明和;王蕾;王红军(南京工业职业技术大学工程技术实训中心,南京210023;南京航空航天大学江苏省精密与微细制造技术重点实验室,南京210016;南京工业职业技术大学机械工程学院,南京210023)

机构地区：[1]Engineering Technology Training Center,Nanjing Vocational University of Industry Technology,Nanjing 210023,China [2]Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]School of Mechanical Engineering,Nanjing Vocational University of Industry Technology,Nanjing 210023,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第3期692-702,共11页中国有色金属学报（英文版）

基　　金：The authors are grateful for the financial supports from Jiangsu Key Laboratory of Precision and Micro-manufacturing Technology of China(JSJMYWX2020-01);Zhejiang Provincial Natural Science Foundation of China(LY18E050005);the Startup Foundation for Introducing Talent of Nanjing Institute of Industry Technology(YK18-13-02)of China.

摘　　要：The deformation mechanism of C5191 phosphor bronze sheet under ultra-high-speed blanking was investigated.By virtue of a DOBBY-OMEGA F1 ultra-high-speed press,the ultra-high-speed blanking test was conducted on C5191 phosphor bronze sheets with a thickness of 0.12 mm at 3000 strokes per minute.The microstructures of the blanked edges were characterized and analyzed separately by electron back-scatter diffraction(EBSD)and transmission electron microscopy(TEM).The results show that grains in the blanked edges are stretched along the blanking direction.Strong{001}<100>cube textures(maximum pole densities of 9 and 12,respectively)and secondarily strong{011}<011>textures(maximum pole densities of 4 and 7,respectively)are formed in local zones.Additionally,deformation twins are found in the shear zone of the blanked edges which are rotated and coarsened due to the blanking-induced extrusion and local thermal effect which can further form into sub-grains with clear and high-angle boundaries.The C5191 phosphor bronze sheet is subjected to adiabatic shear during ultra-high-speed blanking,accompanied with dynamic recrystallization.为了研究C5191磷青铜在超高速冲裁条件下的变形机制,借助DOBBY-OMEGA F1超高速冲床完成0.12 mm厚的C5191磷青铜板材在3000冲次/分条件下的超高速冲裁试验,并分别利用EBSD和TEM技术对冲裁断面进行显微组织表征。结果发现,冲裁断面区域晶粒沿着冲裁方向拉长排列,局部区域形成较强的{001}<100>立方织构(极密度分别为9和12)和次强的{011}<011>织构(极密度分别为4和7);同时,冲裁断面的剪切带区域存在变形孪晶,并在冲裁挤压和局部温升效应下发生旋转、粗化,形成晶界清晰、具有大角度晶界的亚晶;C5191磷青铜薄板在超高速冲裁过程中发生绝热剪切,并伴随有动态再结晶产生。

关 键 词：C5191 phosphor bronze ultra-high-speed blanking blanked surface adiabatic shear dynamic recrystallization 

分 类 号：TG146.11[一般工业技术—材料科学与工程]