On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys

Németh, André A. N.; Crudden, D.J.; Collins, David M.; Kuksenko, V.; Liebscher, Christian; Armstrong, David E.J.; Wilkinson, Angus J.; Reed, Roger C.

doi:10.1007/s11661-018-4619-y

Cited by 8 publications

(1 citation statement)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite its greater Al content, CM247LC is less resistant to oxidation than Alloys 1-3 within this relatively short test period. This is likely due to its greater Ti content, which has been shown to have a deleterious effect on the oxidation resistance [45,46].…”

Section: Oxidation Behaviourmentioning

confidence: 99%

A New Class of Alumina-Forming Superalloy for 3D Printing

Klupś¹,

Dick-Cleland²,

Rankin³

et al. 2021

Preprint

View full text Add to dashboard Cite

A new class of crack-resistant nickel-based superalloy containing high γ fraction is studied for the laser-powder bed fusion (L-PBF) process. The effects of the (Nb+Ta)/Al ratio is emphasised, a strategy that is shown to confer excellent low-temperature strength whilst maintaining oxidation resistance at high temperatures via stable alumina scale formation. The processability of the new alloys is characterised with respect to defect assessment by micro-focus x-ray computed tomography; use is made of a prototype turbine blade geometry and the heritage alloy CM247LC as a benchmark. In all cases, some processing-related porosity is present in thin wall sections such as the trailing edge, but this can be avoided by judicious processing. The cracking seen in CM247LC -in solid-state, liquation and solidification forms -is avoided. A novel sub-solvus heat treatment strategy is proposed which takes advantage of AM not requiring solutioning; super-solvus heat treatment is inappropriate since it embrittles the material by deterioration of the texture and coarsening of grain boundary carbides. The tensile strength of the new superalloy is greatest when the Nb+Ta content is highest and exceeds that of CM247LC up to ∼900 • C. The oxidation resistance is best when Al content is highest, and oxidation-assisted cracking resistance maximized when the (Nb+Ta)/Al ratio is balanced. In all cases these are equivalent or superior to that of CM247LC. Nevertheless, the creep resistance of the new alloys is somewhat inferior to that of CM247LC for which the γ , C, and B contents are higher; this implies a processing/property trade-off which requires further clarification.

show abstract

Section: Oxidation Behaviourmentioning

confidence: 99%