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Erschienen in: Metallurgical and Materials Transactions A 2/2013

01.02.2013

High Strength and Retained Ductility Achieved in a Nitrided Strip Cast Nb-Microalloyed Steel

verfasst von: Kelvin Y. Xie, Sachin L. Shrestha, Peter J. Felfer, Julie M. Cairney, Chris R. Killmore, Kristin R. Carpenter, Harold R. Kaul, Simon P. Ringer

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 2/2013

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Abstract

The current study investigates the strengthening of an Nb-microallyed CASTRIP® steel at 798 K (525 °C) by nitriding in a KNO3 salt bath. Nitriding up to 1 hour dramatically increased the yield strength of the steel by ~35 pct (from 475 to 645 MPa) with no sacrifice of ductility (~16 pct). Further nitriding led to brittle fracture. Hardness profiles of the nitrided steels through the thickness reveal hard surfaces and a relatively softer core. The hardening of the shell in the nitrided steels is thought to be the combined effect of solid solution strengthening from nitrogen and dispersion strengthening from clusters and precipitates. The retained ductility is attributed to the hard-shell–soft-core structure through nitriding.

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Metadaten
Titel
High Strength and Retained Ductility Achieved in a Nitrided Strip Cast Nb-Microalloyed Steel
verfasst von
Kelvin Y. Xie
Sachin L. Shrestha
Peter J. Felfer
Julie M. Cairney
Chris R. Killmore
Kristin R. Carpenter
Harold R. Kaul
Simon P. Ringer
Publikationsdatum
01.02.2013
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 2/2013
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-012-1446-4

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