The machining behaviour of Cr-Mn austenitic stainless steel

Abstract

The dry turning was done on the Cr-Mn austenitic stainless steel. The carbide cutting tool (Indoloy) was used for the machining. The experiments were done applying the Taguchi decoupled design of experiment (DOE) methodologies. Speed (v, m/min), feed (f, mm/rev.), and depth of cut (DOC, d, mm) were the input parameters, and chip reduction coefficient (CRC) and von Mises stress (VMS) were the output parameters. The VMS was greatly influenced by the speed and feed. The DOC negligibly affected the VMS. The VMS was influenced due to the strain-induced martensite (SIM) formation for the specific parameters. The VMS was also influenced due to the strain rate hardening, dynamic recrystallization (DRX), and dynamic precipitation (DP) under different experimental conditions. The chip formation occurred due to strain-induced martensite formation at the low speed, low feed, and low DOC. The SAW tooth mechanism formed the chip for the high speed, feed, and DOC. The sizes of the DRX grains and carbide precipitates (DP) were heavily influenced by the experimental conditions.