Integrative cutting solutions for high manganese steel

 

Integrative cutting solutions for high manganese steel

The RFCS project iCut (Integrative cutting solutions to produce high performance automotive components with high-Mn steel sheet) aims to investigate the edge quality from various cutting methods (press, laser, water jet and discharging) as well as effects of the edge quality on mechanical behaviors of high manganese TWIP (Twinning-Induced Plasticity) steel. In the microstructure characterization, the edge morphology is studied via LOM, SEM and confocal microscopy. Corresponding residual stresses at edges are measured by XRD. The H embrittlement sensitivity of the material to the edge quality is evaluated by SSRT (slow strain rate test) and corresponding tensile fracture surfaces are identified by SEM. Based on the results of relevant experiments, macroscopic cutting process and the coupled hydrogen diffusion are performed by FEM simulation (for example for press cutting, see Figure 1).

  FE simulation of crack propagation during press cutting of HMnS. IEHK (A) FE simulation of crack propagation during press cutting of HMnS.   Edge profile after press cutting with typical zones. IEHK (B) Edge profile after press cutting with typical zones.