KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Shaik, Nagoor BashaSubject: search.filters.subject.double aging

Search Results

Now showing 1 - 1 of 1
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Effect of Post Processing Heat Treatment on the Cyclic High Temperature Hot Corrosion Behavior of the Laser Powder Bed Fusion Processed Inconel 718
    (2026-07-08)
    Sahu, Saroj Kumar
    ;
    Dalai, Renu Prava
    ;
    Shaik, Nagoor Basha
    ;
    Yuangyai, Chumpol
    ;
    Behera, Ajit
    In the present investigation, the cyclic hot corrosion behavior of laser powder bed fusion (LPBF)-processed Inconel-718 superalloy subjected to single-aging (HT-1) and double-aging (HT-2) heat treatments was systematically evaluated. Tests conducted at 850°C for 96 h in a Na<inf>2</inf>SO<inf>4</inf>-NaCl-NaVO<inf>3</inf> molten salt environment demonstrated that HT-2 exhibited significantly enhanced corrosion resistance. The cumulative weight gain for HT-2 was 4.8 mg/cm<sup>2</sup>, compared to 5.7 mg/cm<sup>2</sup> for HT-1 (an approximate 15.8% reduction), alongside a notably lower calculated corrosion rate (584.0 vs. 693.5 mg/cm<sup>2</sup>/year). Cross-sectional analysis indicated that HT-2 formed a thinner, denser, and more adherent oxide scale—primarily Cr<inf>2</inf>O<inf>3</inf> and NiCr<inf>2</inf>O<inf>4</inf> spinel—with reduced chromium depletion beneath the oxide layer. This improved corrosion resistance of HT-2 is attributed to its refined precipitate distribution and enhanced chemical homogeneity, which promote uniform chromium diffusion and the formation of a stable protective oxide barrier. This stable oxide scale effectively limits oxygen ingress, molten salt penetration, and scale spallation during cyclic thermal exposure. Overall, optimized double-aging significantly enhances the cyclic hot corrosion resistance of LPBF-processed Inconel-718. These findings provide important insights into tailoring post-processing heat treatments to improve the high-temperature durability of additively manufactured superalloys.