Plastic Strain Threshold Determination for White Layer Formation in Hard Turning of AISI 52100 Steel Using Micro-Grid Technique and Finite Element Simulations

Abstract

White layer (WL) formation in metal cutting is generally found to have negative effects on the corrosion and fatigue life of machined components. Nowadays, the mechanism of the WL formation has not been understood very well, especially about the contribution of the thermal and mechanical loadings generated by the cutting process on WL formation. The relationship between subsurface plastic strain caused by mechanical loadings and the formation of WLs is of our concern. To address this issue, WL formation in hard turning of AISI 52100 under dry and cryogenic cooling conditions is investigated by subsurface plastic strain measurement using the micro-grid technique, observed by scanning electron microscope (SEM). Due to the considerable low temperature, WL is mainly generated by the mechanical effect rather than the thermal one, and this hypothesis is supported by physically based finite element method (FEM) simulations. From the investigations, we discover the existing plastic strain threshold, which governs the occurrence of WL in hard turning of AISI 52100 steel under cryogenic cooling conditions.

Dynamics of chip formation during the cutting process using imaging techniques: A review

“…As discussed above, use of imaging techniques has mainly been focused on studying the kinematic state on the subsurface, such as material flow and deformation. However, some recent publications have demonstrated direct links between the plastic strain components or eigenstrain in the subsurface and the residual stress 112,113 and between the equivalent plastic strain and white layer formation 132 . Therefore, it is expected that the imaging technique will have an extended range of applications in surface integrity research in the future.…”