Analysis of the Mechanical and Microstructural Fluctuations of High-Strength Steels and Their Effect on Bending Angle

The quality and complexity demands of manufactured parts in sectors such as automotive aeronautics lead to narrower process windows. This affects the repeatability stability process, where material properties variations have a major impact. In bending processes, angle is affected by variability mechanical microstructural properties, especially high-strength materials. To address this, characterization crucial. study conducted on five steels from different suppliers: three DP980 two CP980. These materials are currently used an industrial company sector manufacture real product means U-bending, issue exists. Tensile tests were performed quantify fluctuations. Microstructural analysis was also determine grain size volume fractions martensite ferrite case DP980, ferrite, bainite, retained austenite largest found for hardening exponent, mean size, elongation. analyze their U-bending carried out using after springback measured. A total 250 pieces bent press strokes. Variations up 1.25° between batches same stroke. quantitative correlation estimate influence parameters angle, sheet thickness tensile strength shown be most influential parameters. Knowing this based control approach can developed reduce defects.