Pinning of Austenite Grain Boundaries by Mixed AlN and Nb(C,N) Precipitates

Amrita Kundu; Claire L. Davis; Martin Strangwood

doi:10.4028/www.scientific.net/SSP.172-174.458

Paper Titles

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Precipitation in Aged N-Containing Steels
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Spinodal Decomposition in Fe-Cr Alloys
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Cluster Dynamics Study of Neutron Irradiation Induced Defects in Fe-12.5at%Cr Alloy
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Pinning of Austenite Grain Boundaries by Mixed AlN and Nb(C,N) Precipitates
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Phase Transformations in Lutetium Borides at Heating in Vacuum
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Reactive Diffusion between Ti and Cu-9.3Sn-0.3Ti Alloy at Solid-State Temperatures
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The Microstructure and Mechanical Properties of the Ni-Al-V Alloys Prepared by Levitation and Crystallization in Copper Mould
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Evolution of Twin-Related Variants of α Phase in a Ti-V-Cu Alloy
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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Pinning of Austenite Grain Boundaries by Mixed AlN...

Pinning of Austenite Grain Boundaries by Mixed AlN and Nb(C,N) Precipitates

Abstract:

The use of Nb(C,N) to pin prior austenite grains during thermomechanical processing can give rise to bimodal structures linked to Nb segregation and subsequent variation in precipitate distribution and stability on reheating and deformation. The segregation tendency of Al is much less compared with Nb so that AlN may provide grain boundary pinning in regions of reduced Nb(C,N) volume fraction and stability. Quantification of precipitate and prior austenite grain size distributions after reheating has confirmed the governing mechanisms of precipitate dissolution / coarsening whilst identifying grain boundary pinning by AlN at temperature below 1125 °C, but controlled by Nb(C,N) at higher temperatures.