Enhancing oxidation and corrosion performance of laser PBF Inconel 718 alloy by structural-phase rearrangement and surface nanocrystallization using thermomechanical post-treatment

Enhancing oxidation and corrosion performance of laser PBF Inconel 718 alloy by structural-phase rearrangement and surface nanocrystallization using thermomechanical post-treatment | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Enhancing oxidation and corrosion performance of laser PBF Inconel 718 alloy by structural-phase rearrangement and surface nanocrystallization using thermomechanical post-treatment Dmytro Lesyk, Bohdan Mordyuk, Indrajit Charit, Krishnan Raja, and 5 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7754572/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 23 Feb, 2026 Read the published version in The International Journal of Advanced Manufacturing Technology → Version 1 posted 5 You are reading this latest preprint version Abstract Inconel 718 test parts were manufactured using a laser powder bed fusion (LPBF) additive manufacturing method, which is a promising technology for the production of superalloy endproducts with complex shapes for aerospace applications. The combined thermo-mechanical posttreatments (hot isostatic pressing (HIP), heat treatment (annealing combined with aging), and surface mechanical treatment) were applied to enhance the operational properties of the LPBF-built IN 718 alloy parts. The variation in microstructure and high-temperature performance of LPBF IN 718 alloy with different heat treatments and surface severe plastic deformation (SPD) by shot peening was compared, followed by exposure to air oxidation at 650 °C for 40 h. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies revealed the microstructure and phase state formed after thermo-mechanical post-processing, which provides the increased surface hardness of LPBF samples. The heat treatments increase the oxidation resistance of the studied superalloy manufactured by LPBF. However, homogenization-induced grain growth in the HIPHA process results in a lower anti-oxidation resistance enhancement than that after the HIPA heat treatment. Further surface SPD processing by the shot peening method significantly improves the oxidation resistance of the studied Ni-based superalloy owing to the accelerated formation of protective scales that were favoured by the SPD-induced nanostructure in the near-surface layers of LPBF samples. The corrosion resistance was also improved after the SPD post-processing. Inconel 718 Laser powder bed fusion Thermomechanical post-processing Structural integrity High-temperature oxidation Corrosion behaviour Full Text Cite Share Download PDF Status: Published Journal Publication published 23 Feb, 2026 Read the published version in The International Journal of Advanced Manufacturing Technology → Version 1 posted Editorial decision: Major Revisions Needed 16 Nov, 2025 Reviewers agreed at journal 22 Oct, 2025 Reviewers invited by journal 22 Oct, 2025 Editor assigned by journal 02 Oct, 2025 First submitted to journal 30 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7754572","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":533196080,"identity":"f3dad419-ced4-4dde-b6b8-438165fc539a","order_by":0,"name":"Dmytro 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