Effect of machining processes on the residual stress distribution heterogeneities and their consequences on the stress corrosion cracking resistance of AISI 316L SS in chloride medium

Abstract

GONZÁLEZ -Effect of machining processes on the residual stress distribution heterogeneities and their consequences on the stress corrosion cracking resistance of AISI 316L SS in chloride medium -

Reconstruction of heterogeneous surface residual-stresses in metallic materials from X-ray diffraction measurements

“…Residual stresses are due to spatial gradients of irreversible strains which typically originate from heterogeneous plastic deformation or phase transition. Thus, residual stresses can be generated unintentionally during most manufacturing processes involving irreversible deformation and heat treatment such as in machining (Jacobus et al, 2000;Zhang et al, 2016;Ben Rhouma et al, 2019), welding (Dong and Brust, 2000;Leggatt, 2008), laser marking (Lu et al, 2020), severe plastic deformation (Reyes-Ruiz et al, 2016;Ezequiel et al, 2020) and additive manufacturing (Fang et al, 2020); the presence of undesirable tensile residual stresses can decrease fatigue life and corrosion resistance. On the other hand, compressive residual stresses can be induced on purpose in order to improve durability, by means of several processes such as shot peening (Hammond and Meguid, 1990;Mahmoudi et al, 2016), laser shock peening (Peyre and Fabbro, 1995;Montross et al, 2002) and wire brushing (Ben Fredj et al, 2004).…”

“…The quality of the local residual stress profiles obtained experimentally by X-ray diffraction can thus be very questionable in the zones having high lateral stress gradients, which raises important issues notably in processing validation or for the determination of threshold criteria in stress corrosion cracking (Ben Rhouma et al, 2019). In particular, in the context of process simulation, the averaging effects on residual stresses measured by X-ray diffraction prevent a proper comparison with the local residual stresses determined numerically by the finite element method.…”

Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

“…Besides, this type of surface treatment leads to local dissipation Metals 2021, 11, 135 2 of 14 of energy and matter, accompanied by a poorly controlled temperature increase and cooling, which in part leads to a strong residual compressive stress [12][13][14]. Moreover, a dynamic recrystallization is generated by high deformation and local temperature increase, inducing a nanostructured structure called ultrafine grain layer [13,15,16]. These surface modifications can affect the local properties of the material and the reactivity of the SS [5].…”

“…These surface modifications can affect the local properties of the material and the reactivity of the SS [5]. Consequently, they can induce harmful alterations to the passive film formed on the SS, affecting their corrosion and stress corrosion cracking (SCC) resistances [5,15,17,18].…”

Significant Contribution of Temperature on AISI D2 Tool Steel Ground Surface Characteristics and Integrities

“…It is well established in the literature that material interactions in the grinding process lead to changes in the surface layer properties of the workpiece [3,5,28,34]. Such modifications cover the microgeometrical [6,35], microstructural [12,20,36] and mechanical [5,7,37] aspects. The magnitude and extent of these modifications depend on the thermophysical and microstructural characteristics of the material to be machined, the grinding wheel [6,7], the lubrication conditions [2,3] and the cutting conditions (aw, vw, vs) [38,39].…”