Abstract
Abstract The influence of grain boundary microstructure on the susceptibility of thermally treated (TT) Inconel Alloy 600 to intergranular attack (IGA) and stress corrosion cracking (SCC) in 30%NaOH + 10%Na2SO4 at 350 C was investigated. Both mill-annealed (MA) and laboratory solution-annealed alloys were aged at 700 C to establish the effect of initial processing on the material's response to thermal treatment. Treatments of 1 h or more at 700 C greatly improved the SCC resistance of solution-annealed material but did not improve the performance of MA material containing a high density of intragranular carbides. The poor behavior of this material after thermal treatment was associated with the formation of small M23C6 carbides growing at a high angle to the boundaries and the development of these into cellular colonies. This is attributed to the use of a MA temperature that was too low to take into solution sufficient carbon for the development of semicontinuous grain boundary carbides during the subsequ...
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