Evolution of deformation-induced texture and surface microstructure of nickel coating under deep cup-drawing process

The deformation texture and surface microstructure of nickel coating induced by deep cup-drawing were studied by X-ray diffractometry and SEM. The steel sheet with nickel coating was firstly punched to designed degree of cup shapes. Then the texture of the coating was determined by XRD and the surface microstructure was observed by SEM. The results indicate that,the nickel coating material includes three kinds of textures,i.e. Ni(111),Ni(200) and Ni(220). After cup-drawing deformation,there doesn't appear new texture component for nickel coatings but the change of the intensity of the deformation textures. In the cup-deformation process,the two kinds of main textures Ni(111) and Ni(200) increase in the first and second cup-drawing procedures and then reduce quickly in the third and fourth drawing procedure. However,for the Ni(220) texture,it always increases in whole cup-drawing procedures. With the increase in the drawing,there are some cracks to be found,but not delamination. This shows that nickel coating and the substrate have a good combinable performance.

The deformation texture and surface microstructure of nickel coating induced by deep cup-drawing were studied by X-ray diffractometry and SEM. The steel sheet with nickel coating was firstly punched to designed degree of cup shapes. Then the texture of the coating was determined by XRD and the surface microstructure was observed by SEM. The results indicate that, the nickel coating material includes three kinds of textures, i.e. Ni （111）, Ni （200） and Ni （220）. After cup-＆awing deformation, there doesn＇t appear new texture component for nickel coatings but the change of the intensity of the deformation textures. In the cup-deformation process, the two kinds of main textures Ni （111） and Ni （200） increase in the first and second cup-drawing procedures and then reduce quickly in the third and fourth drawing procedure. However, for the Ni （220） texture, it always increases in whole cup-drawing procedures. With the increase in the drawing, there are some cracks to be found, but not delamination. This shows that nickel coating and the substrate have a good combinable performance.