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Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Article dans une revue avec comité de lecture
Auteur
SIDHOM, Habib
GHANEM, Farhat
AMADOU, Tidiane
GONZALEZ, Gonzalo
250023 Universidad Nacional Autónoma de México = National Autonomous University of Mexico [UNAM]
ccBRAHAM, Chedly
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/8176
DOI
10.1007/s00170-012-4156-6
Date
2013
Journal
International Journal of Advanced Manufacturing Technology

Résumé

The localised corrosion resistance of austenitic stainless steels is strongly influenced by the quality of finished surface. EDM machining induces substantial changes by the high thermal gradients generated by electric sparks. Experimental techniques such as roughness measurement, scanning electron microscopy (SEM), energy dispersive microanalysis (EDX) and X-ray diffraction technique, reveal microgeometrical, microstructural, chemical and mechanical changes. These changes lead to white and heat-affected layers with a depth less than 100 μm. The white layer is a melted material characterised by dendritic structure and constituted by austenite, chromium carbide and ε-carbide. The heat-affected layer is characterised by very large grain size comparatively to the bulk material. Electrochemical test coupled with metallographic examinations using SEM reveals a weakening of the resistance to pitting and intergranular corrosion comparatively to diamond polished surface. This weakening is correlated to differences in structure and chemical composition of white layer. Susceptibility to stress corrosion cracking has been attributed to the field of tensile residual stresses resulting from thermal effects. The removal of the white layer material by polishing or wire brushing restores the corrosion resistance of the AISI316L SS.

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PIMM-IJAMT-SIDHOM-2013.pdf
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Documents liés

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  • 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 
    Article dans une revue avec comité de lecture
    RHOUMA, Amir Ben; SIDHOM, Naziha; MAKHLOUF, Kamel; SIDHOM, Habib; GONZÁLEZ, Gonzalo; ccBRAHAM, Chedly (Springer Verlag, 2019)
    The effects of machining such as grinding and turning on the microstructural and mechanical changes of the machined surfaces of AISI 316L stainless steel (SS) have been studied. Surface aspects and surface defects have ...
  • Effects of finishing processes on the fatigue life improvements of electro-machined surfaces of tool steel 
    Article dans une revue avec comité de lecture
    GHANEM, Farhat; FREDJ, Nabil Ben; SIDHOM, Habib; ccBRAHAM, Chedly (Springer Verlag, 2011)
    Machining the EN X160CrMoV12 tool steel by electro-discharge machining (EDM) process generates significant modifications of microgeometrical, microstructural and mechanical properties of the upper layers of the machined ...
  • Influences of up-milling and down-milling on surface integrity and fatigue strength of X160CrMoV12 steel 
    Article dans une revue avec comité de lecture
    LAAMOURI, Adnen; GHANEM, Farhat; SIDHOM, Habib; ccBRAHAM, Chedly (Springer Verlag, 2019)
    This paper aims to compare the influences of the two peripheral milling modes, up-milling and down-milling, on surface integrity and fatigue strength of X160CrMoV12 high-alloy steel. The experimental investigations showed ...
  • Evaluation by the double loop electrochemical potentiokinetic reactivation test of aged ferritic stainless steel intergranular corrosion susceptibility 
    Article dans une revue avec comité de lecture
    SIDHOM, Habib; AMADOU, Tidiane; ccBRAHAM, Chedly (Springer Verlag/ASM International, 2010)
    An experimental design method was used to determine the effect of factors that significantly affect the response of the double loop-electrochemical potentiokinetic reactivation (DL-EPR) test in controlling the susceptibility ...
  • Correlation between microstructure and intergranular corrosion behavior of low delta-ferrite content AISI 316L aged in the range 550e700 C 
    Article dans une revue avec comité de lecture
    BEN RHOUMA, A; AMADOU, Tidiane; SIDHOM, Habib; ccBRAHAM, Chedly (Elsevier, 2017)
    The microstructure and the phase identification of austenitic stainless steel AISI 316L with low δ-ferrite content (δ ≤ 1%) and aged for up to 80 000 h at temperatures ranging from 550 to 700 °C were investigated by using ...

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