Sep, 2026
ORNL Report
Publications
Showing 59 results for Author: Wei Tang
Jul, 2026
ORNL Report
Strategic Procurement Timeline for Transportation Casks Supporting FSF Operations
Jul, 2026
Journal
Process control-enabled mitigation of microstructural and plastic heterogeneities in additively manufactured Grade 91 steel
Synergizing wire arc-directed energy deposition (WA-DED) additive manufacturing (AM) with particle-strengthened creep strength-enhanced ferritic (CSEF) steels enables fabrication and repair of critical power-plant components. Investigations focused on fusion-welded particle-strengthened CSEF steels, such as Grade 91 steel, have linked microstructurally heterogeneous region…
Mar, 2026
Journal
Use of friction stir processing to synthesize nanocrystalline, grain boundary segregating Fe-Ti alloys
Grain boundary segregating alloys, a class of alloys designed such that nanocrystalline grain sizes are thermodynamically stabilized by the presence of high segregation energy solutes at the grain boundaries, are typically produced through geometrically limited processing techniques such as equal channel angular extrusion or thin film sputtering. This study explores the us…
Mar, 2026
Journal
Infrared triggered dwell and active cooling thermal control effects on microstructural uniformity in DED
Directed Energy Deposition (DED) offers rapid large scale fabrication, but difficulty in delivering consistent microstructures and properties hinders the use of DED fabricated components in safety or performance critical applications. Variability stems from the complex thermal cycles generated by the toolpath used to print the required geometry. Several practical methods h…
Feb, 2026
ORNL Report
Neutron Diffraction Residual Stress Characterization of Large-Scale Components by WA-DED
Two large scale 316L stainless steel cylindrical shells were fabricated by wire arc directed energy deposition (WA DED). Residual stresses were measured by neutron diffraction, and the microstructure and mechanical properties of the printed material were characterized. Longitudinal and transverse residual stresses were compressive at the inner diameter, near neutral at mid…
Feb, 2026
Journal
Mechanical properties and strain localization of WA-DED printed P91 steel
This paper discusses a P91 steel block that was additively manufactured by wire arc direct energy deposition (WA-DED) followed by two types of post-process heat treatment (PPHT). Vickers microhardness and digital image correlation tensile tests were performed along the building direction. The global mechanical properties (i.e., microhardness and tensile properties) and the…
Dec, 2025
Book Chapter
Large-Format Additive Manufacturing with Metallic Materials – Materials Review
This chapter introduces material-oriented topics related to large-format additive manufacturing with metallic materials. The scientific interpretation of material response on the topics listed below is provided with the basis of physical metallurgy: deposition process, postprocess heat treatments, mechanical properties, environmental compatibility, and combined technology.…
Sep, 2025
ORNL Report
ADVANCED STRUCTURAL MATERIAL WELDED JOINTS CHARACTERIZATION AND PROPERTIES TESTING
Jul, 2025
Journal
Gas tungsten arc welding and post weld heat treatment effects on microstructure and mechanical property of castable nanostructured alloy steel
This paper details the first study of castable nanostructured alloy (CNA) steel gas tungsten arc weldability and the post-weld heat treatment (PWHT) effects. Effects of welding heat input, thermal cycles, and PWHT on microstructures, microhardness distributions, room temperature tensile properties, and fracture characteristics are discussed. Results show that CNA steel exh…