Experimental Study On Micro Plastic Forming Behavior Of 304 Stainless Steel Sheet

With the development of modern aerospace, micro medical, electronic communications, textile printing and dyeing technology, the demand for micro systems and related micro metal parts is growing. Although the research on the theory and application of plastic forming in micro scale has been widely carried out, there are still some limitations in theoretical research. With small component size decreases, the plastic deformation area grain number is decreased, the surface grain arrangement and orientation distribution affect the deformation and more significantly, the surface layer model, strain gradient hardening theory and crystal plastic theory research and application although its applicability, but there were also obvious limitations. So this paper studies the effect of surface grain size on the behavior of the surface grain.The materials used in this paper are 304 stainless steel sheets. The uniform grain structure is obtained by heat treatment of different thickness. Then the film is made up of a tensile test. The surface layer of the model has good toughness. In the modified HallPetch, the yield stress of different thickness patterns is more accurate. While the thickness of the material decreases, the tensile strength and elongation of the pattern are decreased.The next micro drawing test on tempered style, drawing curve of displacement force size and different cylinder, grain and grain surface slip effect on drawing force but little effect on the maximum drawing point displacement effect, show the cylinder diameter thinner displacement smaller this size effect of different thickness; for style, style of the thinner the maximum drawing force is small; it has little effect on the displacement of the maximum drawing force when the introduction of Nix- Gao; strain gradient model, establish calculation formula of maximum drawing force with radial phase, and the results are compared with the values of maximum drawing force test, can the actual flow stress to the surface grain effect drawing test process, showing the smaller the stronger the size effect.