The influence of phosphorus on the microstructure and stress-rupture properties in a low thermal expansion superalloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 527; no. 4-5; pp. 911 - 916
• Main Authors: Yu, L.X., Sun, Y.R., Sun, W.R., Sun, X.F., Guo, S.R., Hu, Z.Q.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.02.2010; Elsevier
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fractures; IN783 alloy; Intergranular precipitation; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phosphorus; Physics; Precipitation; Stress-rupture; Thermal expansion; Thermal expansion; Phosphorus; Intergranular precipitation; Stress-rupture; IN783 alloy; Nickel base alloys; Beta phase; Impurity; Segregation; Rupture; Intergranular cracking; Phosphorus addition; Superalloy; Precipitation; Transition metal alloy; Microstructure
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2009.09.035

The influence of phosphorus on the microstructure and stress-rupture properties of IN783 alloy, the newly developed low thermal expansion superalloy, was investigated. Addition of phosphorus markedly promotes the precipitation of β-NiAl phase which improves the intergranular oxidation resistance of high P-doped alloys. However, phosphorus segregation deteriorates the interfacial cohesion of intergranular β/γ matrix and induces many intergranular cracks. Consequently, the stress-rupture life is reduced in high P-doped alloys.