Effect and role of alloyed Nb on the air oxidation behaviour of Ni-Cr-Fe alloys at 1000 °C

Ya Xin Xu; Jin Tao Lu; Xia Wei Yang; Jing Bo Yan; Wen Ya Li

doi:10.1016/j.corsci.2017.08.003

Effect and role of alloyed Nb on the air oxidation behaviour of Ni-Cr-Fe alloys at 1000 °C

Ya Xin Xu
, Jin Tao Lu
, Xia Wei Yang
, Jing Bo Yan
, Wen Ya Li

School of Materials Sience and Engineering

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

77 Scopus citations

Abstract

Ni-25Cr alloys alloyed with Fe (5 wt.% and 15 wt.%) and Nb (0, 1 and 2 wt.%) were designed and their oxidation behaviour was evaluated at 1000 °C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant k_p of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from spinel-included multi-layers in the Nb-free alloy to a much thinner Cr₂O₃ single-layer in the Nb-alloyed alloys. NbC precipitates and slightly dissolved Nb account for these changes.

Original language	English
Pages (from-to)	10-20
Number of pages	11
Journal	Corrosion Science
Volume	127
DOIs	https://doi.org/10.1016/j.corsci.2017.08.003
State	Published - Oct 2017

Keywords

A. Superalloys
B. EPMA
B. SEM
B. XRD
C. High-temperature corrosion
C. Oxidation

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10.1016/j.corsci.2017.08.003

Cite this

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title = "Effect and role of alloyed Nb on the air oxidation behaviour of Ni-Cr-Fe alloys at 1000 °C",

abstract = "Ni-25Cr alloys alloyed with Fe (5 wt.\% and 15 wt.\%) and Nb (0, 1 and 2 wt.\%) were designed and their oxidation behaviour was evaluated at 1000 °C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant kp of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from spinel-included multi-layers in the Nb-free alloy to a much thinner Cr2O3 single-layer in the Nb-alloyed alloys. NbC precipitates and slightly dissolved Nb account for these changes.",

keywords = "A. Superalloys, B. EPMA, B. SEM, B. XRD, C. High-temperature corrosion, C. Oxidation",

author = "Xu, \{Ya Xin\} and Lu, \{Jin Tao\} and Yang, \{Xia Wei\} and Yan, \{Jing Bo\} and Li, \{Wen Ya\}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = oct,

doi = "10.1016/j.corsci.2017.08.003",

language = "英语",

volume = "127",

pages = "10--20",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect and role of alloyed Nb on the air oxidation behaviour of Ni-Cr-Fe alloys at 1000 °C

AU - Xu, Ya Xin

AU - Lu, Jin Tao

AU - Yang, Xia Wei

AU - Yan, Jing Bo

AU - Li, Wen Ya

PY - 2017/10

Y1 - 2017/10

N2 - Ni-25Cr alloys alloyed with Fe (5 wt.% and 15 wt.%) and Nb (0, 1 and 2 wt.%) were designed and their oxidation behaviour was evaluated at 1000 °C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant kp of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from spinel-included multi-layers in the Nb-free alloy to a much thinner Cr2O3 single-layer in the Nb-alloyed alloys. NbC precipitates and slightly dissolved Nb account for these changes.

AB - Ni-25Cr alloys alloyed with Fe (5 wt.% and 15 wt.%) and Nb (0, 1 and 2 wt.%) were designed and their oxidation behaviour was evaluated at 1000 °C. Results reveal that alloyed Nb has a positive impact on oxidation in both the kinetics and oxide scale structures. The parabolic rate constant kp of Nb-alloyed Ni-25Cr-15Fe alloys are nearly one-fourth the value for Nb-free alloy. The oxide scales change from spinel-included multi-layers in the Nb-free alloy to a much thinner Cr2O3 single-layer in the Nb-alloyed alloys. NbC precipitates and slightly dissolved Nb account for these changes.

KW - A. Superalloys

KW - B. EPMA

KW - B. SEM

KW - B. XRD

KW - C. High-temperature corrosion

KW - C. Oxidation

UR - https://www.scopus.com/pages/publications/85027459224

U2 - 10.1016/j.corsci.2017.08.003

DO - 10.1016/j.corsci.2017.08.003

M3 - 文章

AN - SCOPUS:85027459224

SN - 0010-938X

VL - 127

SP - 10

EP - 20

JO - Corrosion Science

JF - Corrosion Science

ER -

Effect and role of alloyed Nb on the air oxidation behaviour of Ni-Cr-Fe alloys at 1000 °C

Abstract

Keywords

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