Mechanical properties of austenitic stainless steel with high niobium contents

M. Okayasu; S. Wu; K. Noda; D. Y. Lin; S. M. Yang

doi:10.1080/02670836.2015.1126431

Mechanical properties of austenitic stainless steel with high niobium contents

M. Okayasu, S. Wu, K. Noda, D. Y. Lin, S. M. Yang

School of Engineering

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

9 Citations (Scopus)

Abstract

To better understand the influence of the microstructural characteristics on the mechanical properties of Fe-Cr₂₂-Ni₂₅-Nb_x austenitic stainless steel (ASS-Nb_x), the mechanical properties were investigated. Nb addition was conducted with four different amounts: 0, 0.29, 0.58 and 0.86%. With the increasing Nb content, the mean grain size for the Fe-Cr-Ni-based alloys decreased, while the size of Nb precipitate increased. Owing to the different microstructural characteristics, their mechanical properties were altered. The highest tensile strength was obtained for ASS-Nb_0.29 alloy. However, with the increasing Nb content in ASS-Nb_0.29–0.86 alloys, the tensile strength decreases despite the grain refinement. The mechanical properties of the ASS-Nb alloys were influenced by the Nb precipitation hardening and the grain boundary cohesive strength, arising from the size of Nb precipitations.

Original language	English
Pages (from-to)	1-13
Number of pages	13
Journal	Materials Science and Technology
DOIs	https://doi.org/10.1080/02670836.2015.1126431
Publication status	Accepted/In press - Jan 20 2016

Keywords

Hall-Petch relationship
Mechanical property
Microstructure
Niobium
Stainless steel

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1080/02670836.2015.1126431

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title = "Mechanical properties of austenitic stainless steel with high niobium contents",

abstract = "To better understand the influence of the microstructural characteristics on the mechanical properties of Fe-Cr22-Ni25-Nbx austenitic stainless steel (ASS-Nbx), the mechanical properties were investigated. Nb addition was conducted with four different amounts: 0, 0.29, 0.58 and 0.86%. With the increasing Nb content, the mean grain size for the Fe-Cr-Ni-based alloys decreased, while the size of Nb precipitate increased. Owing to the different microstructural characteristics, their mechanical properties were altered. The highest tensile strength was obtained for ASS-Nb0.29 alloy. However, with the increasing Nb content in ASS-Nb0.29–0.86 alloys, the tensile strength decreases despite the grain refinement. The mechanical properties of the ASS-Nb alloys were influenced by the Nb precipitation hardening and the grain boundary cohesive strength, arising from the size of Nb precipitations.",

keywords = "Hall-Petch relationship, Mechanical property, Microstructure, Niobium, Stainless steel",

author = "M. Okayasu and S. Wu and K. Noda and Lin, {D. Y.} and Yang, {S. M.}",

year = "2016",

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doi = "10.1080/02670836.2015.1126431",

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T1 - Mechanical properties of austenitic stainless steel with high niobium contents

AU - Okayasu, M.

AU - Wu, S.

AU - Noda, K.

AU - Lin, D. Y.

AU - Yang, S. M.

PY - 2016/1/20

Y1 - 2016/1/20

N2 - To better understand the influence of the microstructural characteristics on the mechanical properties of Fe-Cr22-Ni25-Nbx austenitic stainless steel (ASS-Nbx), the mechanical properties were investigated. Nb addition was conducted with four different amounts: 0, 0.29, 0.58 and 0.86%. With the increasing Nb content, the mean grain size for the Fe-Cr-Ni-based alloys decreased, while the size of Nb precipitate increased. Owing to the different microstructural characteristics, their mechanical properties were altered. The highest tensile strength was obtained for ASS-Nb0.29 alloy. However, with the increasing Nb content in ASS-Nb0.29–0.86 alloys, the tensile strength decreases despite the grain refinement. The mechanical properties of the ASS-Nb alloys were influenced by the Nb precipitation hardening and the grain boundary cohesive strength, arising from the size of Nb precipitations.

AB - To better understand the influence of the microstructural characteristics on the mechanical properties of Fe-Cr22-Ni25-Nbx austenitic stainless steel (ASS-Nbx), the mechanical properties were investigated. Nb addition was conducted with four different amounts: 0, 0.29, 0.58 and 0.86%. With the increasing Nb content, the mean grain size for the Fe-Cr-Ni-based alloys decreased, while the size of Nb precipitate increased. Owing to the different microstructural characteristics, their mechanical properties were altered. The highest tensile strength was obtained for ASS-Nb0.29 alloy. However, with the increasing Nb content in ASS-Nb0.29–0.86 alloys, the tensile strength decreases despite the grain refinement. The mechanical properties of the ASS-Nb alloys were influenced by the Nb precipitation hardening and the grain boundary cohesive strength, arising from the size of Nb precipitations.

KW - Hall-Petch relationship

KW - Mechanical property

KW - Microstructure

KW - Niobium

KW - Stainless steel

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JO - Materials Science and Technology

JF - Materials Science and Technology

ER -

Mechanical properties of austenitic stainless steel with high niobium contents

Abstract

Keywords

ASJC Scopus subject areas

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