Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels

L. Tan; J. D. Poplawsky; Y. Yang

doi:10.1016/j.msea.2021.140900

Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels

L. Tan, J. D. Poplawsky, Y. Yang

Materials MicroAnalysis

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Detailed investigations of two ferritic-martensitic steels, i.e., Nb- and Ta-steel, indicate that the higher Nb diffusivity and the lower nucleation driving force of Nb-carbide promote preferential nucleation of Nb-carbides at grain boundaries and thus a higher boundary occupancy than Ta-carbides, which favored greater creep resistance of Nb-steel than that of Ta-steel despite their similar yield strength.

Original language	English
Article number	140900
Journal	Materials Science and Engineering: A
Volume	807
DOIs	https://doi.org/10.1016/j.msea.2021.140900
State	Published - Mar 11 2021

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The material is based upon work supported by the U.S. Department of Energy (DOE) , Office of Science, Basic Energy Sciences – Materials Science and Engineering Division (modeling) and Fusion Energy Sciences Program, and Office of Nuclear Energy , Nuclear Energy Enabling Technologies Program , under Contract no. DE-AC05-00OR22725. APT was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors would like to thank James Burns for assistance in sample preparation and running the APT experiments.

Funders	Funder number
Basic Energy Sciences – Materials Science and Engineering Division
Fusion Energy Sciences Program
U.S. Department of Energy
Office of Science
Office of Nuclear Energy	DE-AC05-00OR22725

Keywords

Atom probe tomography
Carbide
Diffusion
Reduced-activation ferritic-martensitic steel
Transmission electron microscopy

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10.1016/j.msea.2021.140900

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title = "Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels",

abstract = "Detailed investigations of two ferritic-martensitic steels, i.e., Nb- and Ta-steel, indicate that the higher Nb diffusivity and the lower nucleation driving force of Nb-carbide promote preferential nucleation of Nb-carbides at grain boundaries and thus a higher boundary occupancy than Ta-carbides, which favored greater creep resistance of Nb-steel than that of Ta-steel despite their similar yield strength.",

keywords = "Atom probe tomography, Carbide, Diffusion, Reduced-activation ferritic-martensitic steel, Transmission electron microscopy",

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AU - Tan, L.

AU - Poplawsky, J. D.

AU - Yang, Y.

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AB - Detailed investigations of two ferritic-martensitic steels, i.e., Nb- and Ta-steel, indicate that the higher Nb diffusivity and the lower nucleation driving force of Nb-carbide promote preferential nucleation of Nb-carbides at grain boundaries and thus a higher boundary occupancy than Ta-carbides, which favored greater creep resistance of Nb-steel than that of Ta-steel despite their similar yield strength.

KW - Atom probe tomography

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KW - Diffusion

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KW - Transmission electron microscopy

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Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels

Abstract

Funding

Keywords

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