Nitriding of a Nb-Microalloyed Thin Strip Cast Steel at 525°C

Kelvin Y. Xie; Chen Zhu; Julie M. Cairney; Simon P. Ringer; Chris R. Killmore; Frank J. Barbaro; James G. Williams

doi:10.4028/www.scientific.net/MSF.654-656.106

Paper Titles

Characterization of Microstructure and Mechanical Properties of a Nb-Microalloyed Steel after Quenching-Partitioning-Tempering Process
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The Effect of Mn and Si on the Properties of Advanced High Strength Steels Processed by Quenching and Partitioning
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The Isothermal Transformation of Low-Alloy Low-C CMnSi Steels below M_S
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Nano-Scale Analysis of Nano-Bainite Formed in Advanced High Strength Steels
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Nitriding of a Nb-Microalloyed Thin Strip Cast Steel at 525°C
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An Investigation on Precipitation Behaviour of Cu-Rich Phase in Super304H Heat-Resistant Steel by Three Dimensional Atom Probe
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Study on Carbonitride Precipitating Process in Nb-V Micro-Alloyed Steel
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650°C Long-Term Structure Stability Study on 18Cr-9Ni-3CuNbN Heat-Resistant Steel
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In Situ TEM and APT Analysis on the Dislocations Associated with Solute Carbons in Strain-Aged Low Carbon Pipeline Steels
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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Nitriding of a Nb-Microalloyed Thin Strip Cast...

Nitriding of a Nb-Microalloyed Thin Strip Cast Steel at 525°C

Abstract:

This study investigates the effect of N diffusion on a Nb-microalloyed steel made by twin roll casting at 525o C in a KNO3 salt bath. Nitriding up to 4 h increases the yield strength of the steel by ~50% with only a small drop in ductility, while 6 hours of nitriding causes brittle fracture. The improved mechanical performance after 4 hours of nitriding is thought to be a combined effect of solid solution strengthening of N diffusion and dispersion strengthening from extremely fine Nb-rich precipitates. Coarse features along grain boundaries consistently observed in steel nitrided for 6 hours are considered to be responsible for brittle fracture in samples nitrided for longer.

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Periodical:

Materials Science Forum (Volumes 654-656)

Pages:

106-109

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.106

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Online since:

June 2010

Authors:

Kelvin Y. Xie, Chen Zhu, Julie M. Cairney, Simon P. Ringer, Chris R. Killmore, Frank J. Barbaro, James G. Williams

Keywords:

Atom Probe Tomography (APT), HSLA Steel, Niobium Nitride, Nitriding, TEM

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