Publications
Showing 203 results for Author: Yukinori Yamamoto
Sep, 2025
Journal
Rapid assessment of the creep rupture life of metals: A model enabling experimental design
Prediction of the creep rupture life of engineering metals is critical for qualification and design of new materials. The use of long-term creep tests and the need to quantify the performance variability in a priori similar systems hinder the rapid creep assessment of a given material. Therefore, it is essential to develop methods that can extrapolate the long-term perform…
Sep, 2025
Book Chapter
Chapter 3.3 – Status of U.S. reduced activation bainitic steel
Bainitic ferritic steels containing 2.25–3 wt.% chromium are one of the candidate materials for lifetime structural components in fusion reactors, such as vacuum vessels or structural rings. These steels offer high-temperature properties, good weldability, and potentially low capital cost (Klueh et al., 1997; El-Guebaly et al., 2013; Rowcliffe et al., 2018). Although there…
Aug, 2025
ORNL Report
Feature Based Qualification of 17-4PH Stainless Steel to Evaluate Location-Specific Variability in Wire Arc Additive Manufacturing
Qualifying large-scale metal additive manufacturing (M-AM) technologies such as wire arc additive manufacturing (WAAM) can be challenging. This is especially significant in precipitation hardened martensitic stainless steels like SS 17-4PH, where thermal histories induce location-specific microstructural variability and property anisotropy. The Department of Defense (DOD)…
Aug, 2025
Journal
Physics-coupled Data-driven Design of High-Temperature Alloys
We present a materials design loop, which streamlines physics-coupled machine learning (ML) surrogate models to discover new alloy chemistries with improved properties. The efficacy is demonstrated by discovering a high-temperature alumina-forming austenitic (AFA) stainless steel with enhanced creep, followed by experimental validation. The ML models have been trained usin…
Aug, 2025
Journal
Localized material compression to correct distortion in wire arc additive manufacturing
Wire Arc Additive Manufacturing (WAAM) is an advanced manufacturing technology which utilizes welding systems to generate three dimensional geometries in a layer-by-layer fashion. Distortion or warping of a print substrate and WAAM components due to thermally induced residual stresses is an ongoing challenge limiting the widespread adoption of WAAM technologies for produci…
Aug, 2025
Journal
Hydrogen charging and desorption from microstructural viewpoint: A method for deconvoluting hydrogen desorption spectra and unveiling the hydrogen-microstructure interaction
Understanding the interaction of hydrogen with microstructural features in metallic materials is crucial for designing hydrogen-resistant alloys. Although thermal desorption spectroscopy (TDS) is widely used for investigating the hydrogen binding behavior of various microstructural features, its application to face-centered cubic (fcc) metals and alloys that exhibit low hy…
May, 2025
Journal
Recrystallization driven softening and heating rate dependencies of FeCrAl nuclear fuel cladding during accident transients
A refined understanding of FeCrAl cladding behavior during rapid transients is critical for its potential deployment in light-water reactors. Current assessments focus on transient burst testing metrics such as balloon geometry, burst temperature, and hoop stress, often used as proxies for simpler conventional tensile properties. However, directly correlating isothermal te…
May, 2025
ORNL Report
Wire Arc Additive Manufacturing of Lightweight High Pressure Die Casting Tooling
Dec, 2024
Journal
Denoising diffusion probabilistic models for generative alloy design
Inverse material design is an extremely challenging optimization task made difficult by, in part, the highly nonlinear relationship linking performance with composition. Quantitative approaches have improved significantly owing to advances in high throughput experimentation and computational thermodynamics. However, existing physics-based tools are mostly forward models; i…