Crack-Free Welding of a Co-Base Superalloy with High γ' Precipitate Fraction

Haußmann L, Burbaum B, Stoehr B, Förner A, Freund L, Göken M, Neumeier S (2022)

Publication Type: Journal article

Publication year: 2022

Journal

DOI: 10.1002/adem.202200609

Abstract

Laser cladding of superalloys provides an attractive and cost-efficient technique for near-net shape manufacturing, remanufacturing, or individualized repair of components. While the weldability of γ' hardened Ni-base superalloys is limited, Co-base superalloys should have a lower susceptibility for cracking during welding due to a lower γ' solvus temperature and less segregation than Ni-base superalloys. The weldability of the Co-base superalloy CoWAlloy2Mod and the resulting mechanical properties at 950 °C are investigated. In the as-welded condition of CoWAlloy2Mod, a fine dendritic microstructure without forming cracks and limited porosity is found. After a three-step heat treatment, recrystallized, equiaxed grains and a high γ' volume fraction are obtained leading to a very good strength. CoWAlloy2Mod shows a significantly higher strength and creep strength than the conventional weld filler Co-alloy PWA795.

Authors with CRIS profile

Involved external institutions

Siemens AG, Energy Service Division / Energy Sector Germany (DE)

How to cite

APA:

Haußmann, L., Burbaum, B., Stoehr, B., Förner, A., Freund, L., Göken, M., & Neumeier, S. (2022). Crack-Free Welding of a Co-Base Superalloy with High γ' Precipitate Fraction. Advanced Engineering Materials. https://dx.doi.org/10.1002/adem.202200609

MLA:

Haußmann, Lukas, et al. "Crack-Free Welding of a Co-Base Superalloy with High γ' Precipitate Fraction." Advanced Engineering Materials (2022).

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