Towards understanding the thermal history of microstructural surface deformation when cutting a next generation powder metallurgy nickel-base superalloy

Despite the ongoing progress in metallurgical characterisation of machined surfaces, knowledge thermal conditions under which they originate during workpiece-flank interaction is still lacking. When cutting advanced superalloys, little known about temperature evolution part volume, where workpiece material interacts with tool flank. In this work, characteristics field and resulting surface metallurgy induced a next generation nickel-base superalloy have been studied for scenarios involving different combinations thermo-mechanical boundary conditions. Analysis subsurface has allowed heating cooling rates by to be revealed, allowing description two distinct types cycle, Heating-Peaking-Cooling (H–P–C) Heating-Quasi-isothermal Deformation-Cooling (HQC) structure depending on process aggressiveness. Subsurface history found relate severity cutting-induced deformation, as it combines information magnitude rates. Furthermore, balance equations applied study rate heat due its own plastic deformation while interacting This revealed that highest occurred thin layers at beginning contact, associated white (WLs) are generated. Energy analysis furthermore indicated development less severe impulsive higher depths, linked formation mechanism drag (MD) layers. way, surfaces related their integrity, in-depth understanding physical developing when next-generation superalloys.