Nickel alloy UNS N10276 is nominally a single-phase, corrosion-resistant alloy used in a wide variety of applications, particularly in the chemical process industries. Rich in alloying elements like Mo and Cr that promote corrosion resistance, the grain boundary precipitation of mu (μ) phase is avoided since it is typically associated with sensitization. Recent work by the present authors to create an atlas of microstructures for this alloy included experimental validation of calculated Time-Temperature-Transformation (TTT) curves as a function of variation in alloying elements within the composition space specified for the alloy. Precipitation of the intermetallic mu (μ) phase was experimentally determined to be the exclusive result of the heat treatment regimens applied to verify the positions and shapes of calculated TTT curves. The present work is an empirical investigation of the sensitization behavior of alloy UNS N10276 as a function of mu precipitation – the first step toward generating Time-Temperature-Sensitization (TTS) curves that can be directly compared to empirical TTT behavior.

Subject
Test methods, Materials, Precipitation (solids), Composition, Corrosion rate, Microstructure, Nickel based alloys, Mass loss, Heat, Sensitization, Grain boundary, Heat treatment, Samples
Keywords:
Sensitization, corrosion testing, electrochemical testing, nickel alloy UNS N10276
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2019
Association for Materials Protection and Performance (AMPP)
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