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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2018
Presentation Title Oxidation Resistance of W Substituted Mo-Si-B
Author(s) Gaoyuan Ouyang, Pratik K Ray, Tuba Karahan, Matthew J Kramer, Mufit Akinc
On-Site Speaker (Planned) Gaoyuan Ouyang
Abstract Scope Mo-Si-B alloys are promising materials for next generation turbine blades that require higher operating temperatures. Its metal phase offers excellent creep resistance and fracture toughness, and its intermetallic T2 phase offers exceptional oxidation resistance. W substitution in Mo-Si-B resulted in the destabilization of the deleterious A15 phase, and altered the oxidation behavior. It was found that the oxide scale coverage of the transient oxidation stage greatly depended on the microstructure size scale and the metal oxide removal rate. Uniform scale coverage was achieved with alloys having finer microstructure size scales produced by arc melting compared to the ones having larger grains produced by sintering. Unlike (MoO<SUB>3</SUB>)<SUB>3</SUB>, which volatilizes above 700°C, significant volatilization of (WO<SUB>3</SUB>)<SUB>3</SUB> does not happen until 1300°C. The presence of (WO<SUB>3</SUB>)<SUB>3</SUB> on the surface adversely affected the oxidation resistance at 1100°C. At 1400C, (WO<SUB>3</SUB>)<SUB>3</SUB> was removed, and adequate scale coverage was obtained for improved oxidation resistance.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


A Metallurgical Study of Pressure Resistance Welded Molybdenum Based Materials
A Study on the Potential Analogous Rhenium Effect of Manganese in Tungsten-molybdenum Alloys Prepared by Mechanical Alloying
Alloying Behaviour and Properties of Tetragonal Nb5Si3
Assessments of the Mo-Si-X-(B) System for High Temperature Structural Application Potentials
Characteristics of Dynamic Abnormal Grain Growth in Mo and Ta
Effect of Oxide Coating on the Fusion Welding of Molybdenum Tubing
Fabrication of Tungsten Nanopowder by Combustion-based Method
Fracture Toughness Evaluation and Microstructural Characterization of Drawn Tungsten Wires
High Ductility in Bulk Polycrystalline Tungsten Produced by Equal Channel Angular Extrusion
High Temperature Oxidation Behaviors of Refractory Complex Concentrated Alloys (RCCAs)
Mechanical Behavior of a Three-phase Mo-Si-B Alloy Produced by Reaction Synthesis
Microstructure and Mechanical Properties of Cr-Si High-temperature Alloys
On the Design and Selection of Nb In Situ Composites
Opportunities for BCC Refractory-metal-based Superalloys
Oxidation and Creep Behavior of Mo-Si-Ti Alloys
Oxidation Resistance of W Substituted Mo-Si-B
Synthesis of MoC-graphite Composite by High-energy Ball Milling
Tensile Response of Binary Mo-Si Solid Solution Alloys

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