Atom probe analysis of nickel-based superalloy IN-718 with boron and phosphorus additions

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1998-07, Vol.250 (1), p.115-119
• Main Authors: Sijbrandij, S.J, Miller, M.K, Horton, J.A, Cao, W.D
• Format: Article
• Language: English
• Subjects: Applied sciences; Atom probe; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Field ion microscopy; IN-718; Materials science; Metals. Metallurgy; Microanalysis; Nickel-based superalloys; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Precipitation; Solid solution hardening, precipitation hardening, and dispersion hardening; aging; Solid solution, precipitation, and dispersion hardening; aging; Solid-phase precipitation; Treatment of materials and its effects on microstructure and properties
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(98)00546-2

The effects of controlled additions of boron and phosphorus to nickel-based superalloy IN-718 have been investigated by atom probe field ion microscopy in specimens subjected to a long term heat treatment (6 months at 704°C). The predominant γ, γ′ and γ′′ phases were found to be depleted in boron and phosphorus, and no segregation was detected at γ–γ′ and γ–γ′′ interfaces. Significant phosphorus enrichments were found in the minor σ and Laves phases.