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Grain boundary segregation in inconel 600
Author(s) -
Caceras P.,
Ralph B.,
Allen G. C.,
Wild R. K.
Publication year - 1988
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740120304
Subject(s) - materials science , grain boundary , metallurgy , inconel , intergranular corrosion , superalloy , stress corrosion cracking , alloy , embrittlement , microstructure
Abstract Inconel 600 is a nickel‐based superalloy which has been shown to exhibit stress corrosion cracking under certain conditions. In general the stress corrosion cracking (SCC) is intergranular in nature and hence attention has been focused on the grain boundary microstructure. A series of model alloys was produced with a range of impurity levels. Initially a high‐purity base alloy was prepared to which boron, carbon, silicon and phosphorus was added. Alloys were then examined in the mill‐annealed state and after a standard thermal ageing treatment. The grain boundary interface was analysed using scanning Auger microscopy (SAM) with the grain boundaries being exposed, only after hydrogen embrittlement, using an in situ tensile stage. The segregation of phosphorus and boron to the grain boundary surface was studied and a number of particles identified at grain boundaries. The effect of the segregants on the mechanical properties of this alloy is discussed.