New generation micro alloy steel composition development and prototype production process design

With this project, it is aimed to select and develop steel alloy, and design innovative forging process with this raw material for high strength cardan shaft production. Within the scope of raw material selection and development, the ability of the carbide-nitride-forming steel alloying elements to improve the mechanical properties of the product together with the forging process were investigated with the support of simulation. Product characteristics produced by metal forming processes are affected by raw material properties, pre-deformation annealing, number of forging operations, deformation rate and temperature, friction and cooling conditions. In this project, the effects of different variables were analyzed together; i) Digitalization and indexing of thermal, mechanical and metallurgical properties of the steel alloy compositions developed, ii) forging with finite element-volume method, and cooling process design, iii) As a result of the processing of numerical data, combinations with superior mechanical properties were obtained. As a result of the project, the selection of alloy elements and alloy design have been carried out C, N, Si, Mn, Al, V, Ti, Nb and Cr elements of the micro-alloy elements of the Al, Ti, V and Nb elements (in total a maximum of 0.22%, sample qualities S480W, S600, S600MC, S700 MC plates) C and N and the carbides and nitrites, which are formed by atoms, the austenite phase, the solubility of the designed composition based on the dynamic recrystallisation temperature, deformation rate and temperature and the process of precipitation with the process of physical metallurgy, grain refinement mechanism, controlled cooling design and TTT and CCT diagrams of the composition were determined. This process is a thermomechanical process where the deformation rates vary between 5-70% and the temperatures are realized in the temperature range ( this temperature affects by C, Ti, Al, Si, Nb and V elements) where austenite is not recrystallized according to the alloy composition. Deformation after cooling process causes the austenite structure to be of fine-grained ferrite and perlite structure. The final cutting depth process is given a little more than the temperature at which the austenite is beginning to transform to the ferrite. At this point, the thermomechanical and controlled forming processes based on the virtual material properties store were made at different deformation rates and temperatures (in the phase region). After simulated forging processes, the effects of different heat transfer coefficients in air, accelerated air cooling, water + air, water-spray environment on the basis of alloy TTT-CCT were analyzed.