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Soumyabrata Basak,Sumit K. Sharma,Mounarik Mondal,Kisor K. Sahu,Srikant Gollapudi,Jyotsna Dutta Majumdar,Sung‑Tae Hong 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The present work discusses changes in hardness, wear, and corrosion behavior of electron beam (EB) surface treated (orsimply, EB treated) 316L austenitic stainless steel (ASS) vis-à-vis the as-received material. Due to rapid solidification withinthe EB treated region, a fine dendritic structure develops within the surface and sub-surface of the EB treated material, whichaccounts for its superior hardness, wear, and corrosion behavior. The surface microhardness of the EB treated material is22% enhanced than that of the as-received material. The cumulative wear depth of the EB treated material is 77% lowerthan the as-received material. An improvement in corrosion potential and an order of magnitude reduction in equilibriumcorrosion current density are observed following EB treatment. The results of the present study suggest that EB treatmentcan be effectively used to enhance the surface properties of the selected ASS by microstructural refinement of the surfaceand sub-surface of the material.
Raju Prasad Mahto,Sharath Anishetty,Arnab Sarkar,Omkar Mypati,Surjya Kanta Pal,Jyotsna Dutta Majumdar 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The use of aluminum in conjunction of steel can reduce the weight of structures but dissimilar materials welded structureresults in the formation of intermetallic compounds and inhomogeneous distribution of grains. Since aluminum is moreactive than the steel, the structures made from such dissimilar materials can be affected from corrosion medium which needsto be investigated. In the present work, friction stir welding has been used to join AA6061-T6 and AISI304 in lap configuration,each having a thickness of 1 mm under varied process parameters. The detailed investigations have been made whichincludes understanding the effect of process variables on microstructures, intermetallic compounds and their phases, andthereby on corrosion of the aluminum-steel welded joint. SEM with integrated EBSD detector and XRD analyses have beencarried out to characterize the weld interface that revealed the evolution of grain boundaries and existence of phases suchas Fe2Al5and AlCrFe2. The grain size of the weld zone has been found to be decreasing with increase in weld speed andplunge depth. The temperature profiles have shown a faster rate of heating and cooling with increase in welding speed andplunge depth which led to the refinement of microstructure. The evolution precipitates mainly comprised of Al, Mg and Sias the major elements. The corrosion rate was found to be increasing with decrease in grain size. Samples were corroded bypitting corrosion, inter-granular corrosion, and environmental corrosion. Severity of pits have been found to be non-uniformin the along weld cross-section.