Numerical Simulation Of Ultrafine Grained Metastable Steel During Cold Rolling

With the rapid development of the automotive industry, to use on automotive materials have higher requirements. Ultrafine- grained metastable ultrafine grained steel is based on the organization and the TRIP effect developed an advanced high-strength automotive steel, with excellent mechanical properties. Based on the commercial finite element software DEFORM, the establishment of a metastable ultrafine grained steel cold rolling process three-dimensional finite element mode l of the four-roll. Article established a databa se ultrafine grained materials metastable steels in DEFO RM, and under different conditions simulated ultrafine-grained metastable steel cold rolling process. Discuss the friction coe fficient, the tensile stress, the impact of the reduction ratio of ultrafine-grained metastable steel cold rolling process rolling force for the develop ment of ultra- fine grain metastable steel cold rolling process provides a basis and reference value, the actual production can play a guiding role.Through the use of reasonable network of po ints, a finite element mod el to get the strip thickness variations caused by meshing based on precise calculations, based on the thickness tolerance control in less than 20%. App lication of elastic-plastic finite element method, using the finite element software DEFORM successfully simulate the rolling process metastable ultrafine grained steel. There has been the impact of the law on the rolling force during rolling friction coe fficient be fore and after tension reduction rate. The results show that: the coefficient of friction in contact with the rolling force increases, a nd linear trend changes; rolling force almost line arly with the front tension trend, little change be fore the cha nge of tension of the rolling force of the impact. Tension in the front two factors can significantly reduce tension after rolling pressure applied. Before and after the change in tension while the process of the decrease in the rolling force is the largest; in the 16.7% to 50% of the reduction rate range selected reduction ratio 16.7%, 33.3%, 50% simulation, by contrast, Longitudinal trends get rolling pressure along the contact arc length. With the increase of the reduction rate, rolling force is skyrocketed, and the reduction rate increases by 1%, corresponding to the rolling force will increase about 1MN.