A method for producing high-strength plastic product ultra-high-strength third-generation steel for automobiles by multi-dimensional enhanced plasticization

Abstract

The invention discloses a method for producing high-strength-and-ductility-product ultrahigh-strength third-generation automobile steel in a multi-dimension reinforcing and plastifying mode, belongingto the technical field of novel materials. According to the method, a low-alloy content carbon-chromium-manganese-nickel micro-alloyed steel system is developed through use performance reverse design; on the basis, a new multi-dimension reinforcing and plastifying technical path which is based on a principle and application conditions of developing second-phase particles for reinforcing and plastifying and is matched with structure refining and multi-phase structure design is developed; the plasticity of a steel material is improved at ultrahigh-strength conditions; the technical problem of realizing high strength and plasticity of the steel material simultaneously is solved; and therefore, a high-strength-and-ductility-product aim that the strength and ductility product is above 20 GPa%is realized at an extension strength level of more than 1200 MPa is realized. According to the method, the high-strength-and-ductility-product ultrahigh-strength third-generation automobile steel is manufactured at current equipment conditions by utilizing multiple means; the method is low in cost, low in energy consumption and easy to realize, and is applicable to large-scale industrial production of the third-generation automobile steel.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a method for producing high-strength plastic product and ultra-high-strength third-generation steel for automobiles through enhanced plasticization, which is specifically used in the development of third-generation automobile steels to meet the requirements of automobile safety and light weight requirements. Background technique [0002] Ultra-high-strength automotive steel with a tensile strength above 1000 MPa is mainly used in important structural parts such as the passenger cabin and anti-collision beams, which play a decisive role in the safety of the vehicle. Generally speaking, the improvement of material strength is often at the expense of plasticity. Therefore, the plasticity of existing ultra-high-strength automotive steels is relatively low. Taking the first-generation automotive steels DP980 and DP1180 commonly used at present as examples, their elo...

AI Technical Summary

Problems solved by technology

Therefore, the plasticity of existing ultra-high-strength automotive steels is relatively low. Taking the first-generation automotive steels DP980 and DP1180 commonly used at present as examples, their elongation is often less than 10%.

As a result, there are two problems that cannot be ignored: 1) the deformation of ultra-high-strength steel and the forming of parts are difficult, and problems such as fracture, springback and mold wear are prone to occur during the forming process; The ability to impact energy is reduced, and it is easy to cause structural breakage and cause personal injury

In these technical routes, the plasticity improvement is mainly through the mechanism of residual austenite transformation-induced plasticity or twinning-induced plasticity, and there is no mention of multi-dimensional enhanced plasticization using multiple plasticizing mechanisms to improve plasticity under ultra-high strength conditions. problems, and there is no solution to the key scientific and technical issues of composition design and process design from the common method of cold rolling annealing process and hot forming process