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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.
Mounarik Mondal,Soumyabrata Basak,Hrishikesh Das,Sung-Tae Hong,Howook Choi,Ju-Won Park,Heung Nam Han 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.5
A bimetallic ring component is forged by a friction stir assisted forging (FS-forging). A cylindrical bimetallic blank, magnesium AZ31 cylinder (Mg core) tightly fitted inside an aluminum 6061-T6 tube (Al skin), is used. In the FS-forging, the frictional heat and stirring of rotating tool forge the blank into a desired shape, while simultaneously generate a solid-state joint between the Mg core and the Al skin, without additional external heating, as confirmed by the microstructural analysis and mechanical tests. The microstructural analysis also shows that the characteristics of the solid-state joint can be different depending on the process parameters.
Advanced Surface Engineering Approaches for Exotic Applications
Sutanuka Mohanty,Soumyabrata Basak,Debasis Saran,Kajari Chatterjee,Turin Datta,Atul Kumar,Chandra Prakash,Doo-Man Chun,Sung-Tae Hong,Kisor Kumar Sahu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.2
Selection and classification of suitable materials for exotic applications, including aviation/space, nuclear, oil &gas industries, are still challenging since these applications are typically very demanding in terms of microstructural, mechanical, and electrochemical properties. Surface engineering plays an important role in controlling the properties of the exposed surface, which play key roles in interfacing with another material or exposure to the environment, promoting desirable chemical reactions, and suppression of corrosion. Hence, modification of the surface characteristics of desired materials to the desired depth without altering their bulk properties is essential. The present review focuses on using some of the latest and most advanced surface engineering tool sets such as laser, electron beam (EB), friction stir processing (FSP), ion beam, and plasma immersion ion implantation (PIII). Such techniques provide substantial improvements in wear and corrosion resistance, reduction in frictional losses, increased fatigue life, and enhanced chemical stability at high temperatures for exotic applications.