Structure-Property Relationship in a Haynes® 242TM Alloy Subjected to Long-Term Exposure at 650°C

Elżbieta Stępniowska; Stanisław Dymek

doi:10.4028/www.scientific.net/SSP.186.156

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Structural Perfection of a Single Crystal Nickel-Based CMSX-4 Superalloy
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Structure-Property Relationship in a Haynes^® 242^TM Alloy Subjected to Long-Term Exposure at 650°C
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HomeSolid State PhenomenaSolid State Phenomena Vol. 186Structure-Property Relationship in a Haynes® 242TM...

Structure-Property Relationship in a Haynes^® 242^TM Alloy Subjected to Long-Term Exposure at 650°C

Abstract:

This paper characterizes the microstructure and mechanical properties of the nickel-based superalloy with the nominal composition Ni–25Mo–8Cr (wt.%) after long-term annealing (4000, 6000 and 8000 h) at 650°C. The microstructure was characterized by TEM and SEM. Mechanical properties were measured trough tensile testing. The microstructure, composed initially of a dispersive Ni2(Mo,Cr) strengthening phase in a Ni-based solid solution, decomposed during annealing into a mixture of intermetallic (Ni3Mo- and Ni4Mo-type) phases and recrystallized Mo-lean Ni-based solid solution. The dominant new phase was a plate-shaped Ni3Mo-type phase. Regions adjacent to the plates of the Ni3Mo phase are recrystallized and free from the Ni2(Mo,Cr) strengthening phase.

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Periodical:

Solid State Phenomena (Volume 186)

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156-159

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https://doi.org/10.4028/www.scientific.net/SSP.186.156

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Online since:

March 2012

Authors:

Elżbieta Stępniowska, Stanisław Dymek

Keywords:

Haynes 242 Alloy, Nickel-Based Superalloy, Phase Stability, Tensile Properties

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