KOŇAŘÍK Petr VSB-Technical University of Ostrava

The automotive industry meet the increasingly high demands for speed, stability and security, and especially by the ever greater demands on materials engineering. Construction materials in itself must continually combine multiple features typical of ceramics and plastic. They must have the highest strength and plasticity at the same time. These two competing phenomena are very difficult to combine in one unit and therefore are still developing new technologies that could achieve this effect. These technologies significantly increase the cost of material, hence the price of the final product, which makes this product very poorly for sellers saleable until exclusive. One way to reduce this negative aspect of the product is to reduce production costs. These methods are numerous. In this paper, introduce the possibility of reducing production costs through new technology. Specifically, the manufacturing method STRAD. The purpose of this process is to achieve grain refinement through shearing transformation and plastic deformation after recrystallization resulting in ultra-fine-grained (UFG) steels which feature higher tensile strength combined with good formability. The structure is composed of tempered martensite, ferritical grain with size of several micrometres, or hundreds of nanometres and ultra-fine-grained cementite. The STRAD method can easily be used as continuous process in production.