On the effect of boron on grain boundary character in a new polycrystalline superalloy

By P. Kontis, H. Yusof, S. Pedrazzini, M. Danaie, K. Moore, P. Bagot, Michael Moody, C. Grovenor, R. Reed. 2016

198 citations recorded by the source corpus.

Abstract The role of boron in conferring the grain boundary character in a new polycrystalline superalloy suitable for power generation applications is considered. One boron-free and three boron-containing variants are studied using a suite of high resolution characterisation techniques including atom probe tomography (APT), high resolution secondary ion mass spectroscopy (SIMS) and transmission electron microscopy (TEM). The primary effect of boron addition is the suppression of Cr-rich M23C6 carbide and the formation instead of the Cr-rich M5B3 boride. The SIMS analysis indicates that the boride particles are distributed fairly uniformly along the grain boundaries, of length up to 500 nm along the grain boundary. The substantial majority of the boron added resides in the form of these M5B3 borides; some boron segregation is found at the γ′/M5B3 interfaces but interfaces of other forms – such as γ/γ′, γ/M5B3, γ/MC and γ′/MC – show no significant segregation. Creep testing indicates that the optimum boron content in this alloy is 0.05 at.%.

Subfields: Biomedical Engineering, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/c45b9382118e3c339c6f1650b85ad9cd0b8f03a3

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In Biomedical Engineering

1. Baptiste Gault
2. G. Martin
3. Dierk Raabe
4. E. Chauvet
5. C. Tassin
6. J. Blandin
7. P. Kontis
8. R. Dendievel

In Mechanical Engineering

1. Baptiste Gault
2. E. Jägle
3. Junyang He
4. Dierk Raabe
5. G. Martin
6. R. Dendievel
7. Franz Roters
8. O. A. Zambrano

In Mechanics of Materials

1. Dierk Raabe
2. Junyang He
3. Baptiste Gault
4. Franz Roters
5. Philip Eisenlohr
6. T. Bieler
7. H. Hallberg

Citations in the corpus

• Hot cracking mechanism affecting a non-weldable Ni-based superalloy produced by selective electron Beam Melting (2018, background): “EDX and APT results as well as literature data [8,29,42,43] show the presence of borides along the grain boundaries.”
• Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloys (2019, background): “The intergranular films get enriched in solutes, such as Cr, Mo and B, during the building process, because of remelting and most likely solid-state diffusion, particularly of fast diffusers such as B [26].”