Verification of Johnson-Cook parameters of ferritic stainless steel by drilling process: experimental and finite element simulations
Mehmet Erdi Korkmaz
Abstract
Ferritic stainless steels contain 16%–30% chromium and about 0.05%–0.25% carbon in their compositions. As the carbon and chromium content is high, precipitation of carbide particles provides high strength but also causes brittleness. Ferritic stainless steels are of moderate formability with an excellent corrosion resistance and relatively inexpensive. In this study, the predetermined JC model parameters of the AISI 430 ferritic steels have been verified by comparing the experimental drilling process and drilling simulations. Firstly, the drilling experiments of 430 steel with the uncoated tungsten carbide drill have been performed at three different feed rates and cutting speeds. Then, the pre-determined JC parameters have been adapted into a simulation software running with the finite element method and after the drilling simulations have been operated under the same drilling conditions. By comparing the experimental and numerical data based on the thrust force (Fz), a deviation of 4.83% has been calculated and the validity of the material's JC parameters has been demonstrated.