Simulation And Analysis Of Residual Stress On The Cutting Surface Of Metastable Austenitic Stainless Steel

Austenitic stainless steel has good comprehensive properties and is widely used in hightech industries such as automotive and aerospace.However,austenitic stainless steel is a typical difficult-to-machine material,and the quality of its processed surface has a greater impact on the corrosion resistance and fatigue life of parts.The surface residual stress is the most critical parameter for the integrity of the metal processing surface.Therefore,it is necessary to conduct an in-depth study on the austenitic stainless steel cutting process and the formation mechanism of the residual stress on the processed surface.Under high strain rate cutting conditions,the physical mechanism of residual stress formation under the surface layer includes accumulation of stress fields around dislocations caused by plastic deformation,martensitic transformation,and thermal expansion and contraction related to mechanical energy dissipation.The thermomechanical load acting on the surface of the workpiece during the metal cutting process determines the stress state after processing.However,there is still a lack of quantitative understanding of the thermodynamic basis of residual stress formation during metal cutting.In the design of processing technology,the design method based on experience iteration is still the main method.This paper takes 304 metastable austenitic stainless steel as the research object,uses the finite element software ABAQUS and its subroutine VUMAT for secondary development,establishes a two-dimensional cutting finite element model considering martensitic transformation and phase transformation plasticity,and analyzes the cutting The change law of force,cutting temperature and martensite transformation under different machining conditions is studied,and the residual stress formation process based on thermodynamic energy conversion is studied.This paper links the residual stress state of the cutting surface with the input of thermal and mechanical energy during the machining process,and establishes the correspondence between the residual stress state of the surface and the energy conversion.The research results of this work can be used to guide the selection of cutting process parameters,and can also be used to describe the formation process of residual stress in other processing processes.