Metallurgical Aspects of the Spinning Process in Metallic Liners

Document Type : Original Article


1 Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran


Spinning is one of the novel and unique processes in metal forming for the production of cylindrical and conical thin-walled parts with precise tolerances, good surface smoothness and suitable mechanical properties. This process includes conventional spinning, shear forming and flow forming. Metallurgical investigation is great importance in this process. The microstructure obtained from the spinning specimens, especially the shear forming and flow-forming, shows that the grains and the impurity particles are elongated in the direction of the main axis and are also stretched in the circumferential direction. This change in grain size on the roller side was larger than on the mandrel side. Fragmentation of coarse and brittle particles has also been observed. Also, due to the amount of strain and forces applied, the grain size decreases and as a result, the strength increases. The texture of the spinning parts has also changed. As the thickness decreases, the orientation of the grains and textures increases and the large angle boundaries increase


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