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On the Influence of Ta and Ti on Heat‐Treatability and γ/γ’‐Partitioning of High W Containing Re‐Free Nickel‐Based Superalloys
Author(s) -
Ritter Nils C.,
Schesler Ekaterina,
Müller Alexander,
Rettig Ralf,
Körner Carolin,
Singer Robert F.
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700150
Subject(s) - superalloy , materials science , homogenization (climate) , volume fraction , alloy , refractory metals , solid solution , metallurgy , refractory (planetary science) , solid solution strengthening , nickel , microstructure , nickel alloy , thermodynamics , composite material , ecology , physics , biology , biodiversity
Refractory elements like W are potent solid solution strengtheners, but they are also heavy and costly. They should be used as sparingly as possible. In the present paper, a series of single crystal alloys are prepared with varying amounts of Ta and Ti, but constant overall refractory concentration and γ’‐volume fraction. Partitioning behavior of W and other elements after solutionizing and ageing treatment is investigated. Both, Ta and Ti are able to increase the W content in the γ‐matrix. This provides an effective strategy to maximize solid solution strengthening potential for a given overall W content of the alloy. The experimentally determined phase characteristics and homogenization behavior are compared with numerical simulation. Good agreement is observed.