Advisor: Prof. Suman Das (ME/MSE)
will defend a master’s thesis entitled,
In-Situ Alloying Strategies for Enhanced Hydrogen Embrittlement Resistance in IN718: A Coupon-Scale Study Utilizing Scanning Laser Epitaxy
On
Monday, July 21st at 10:00 a.m.
GTMI Room 211
Or
On Teams
Meeting ID: 275 818 703 245
Passcode: bk68uk9G
Committee
Abstract
This preliminary study establishes a high-throughput scanning laser epitaxy (SLE) methodology for in-situ alloying of IN718 superalloy at the coupon scale, targeting the accelerated development of hydrogen-resistant formulations for hot gas path components in hydrogen-fueled turbines. Seventeen modified IN718 compositions with tungsten (1.50–2.00 wt.%) and titanium (1.50–2.00 wt.%) additions were synthesized to enhance hydrogen embrittlement resistance (HER). Microstructural characterization revealed uniform dendritic structures across all coupons, while X-ray fluorescence confirmed homogeneous elemental distribution. Hydrogen charging tests (200 hours) demonstrated that tungsten-enriched formulations exhibited significantly smaller microhardness increases (ΔHV < 15% vs. >30% in baseline IN718), indicating superior HER. These results validate SLE as an efficient screening platform for rapid alloy development and identify tungsten as a critical HER-enhancing element. The study provides foundational data for future macroscale additive manufacturing of components with enhanced resistance to hydrogen environment embrittlement.
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