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Microstructural and properties evolution of austenitic heat resistant steel after addition of aluminium

Sun, Y. F. ; Lv, Y. Z. LU orcid ; Zhang, Y. ; Zhao, J. Y. and Wu, Y. (2013) In Materials Science and Technology (United Kingdom) 29(5). p.511-516
Abstract

Effect of aluminium on microstructure and properties of austenitic heat resistant steel was investigated. The results showed that Al addition led to formation of spheroidal and dispersed Ni3Al. After solution treatment, Ni3Al particles experienced a significant refinement from 1.5 μm to nanoscale (∼80 nm). Matrix transformed from austenite to ferrite when addition of Al was >4.72%. Oxidation resistance of samples containing 4.72%Al was two times higher than Al free samples due to the formation of compacted Al2O3 scales. Excessive Al resulted in the formation of Al3Fe5O12 and AlN on oxidation surface, which destroyed the oxidation resistance. Dispersedly... (More)

Effect of aluminium on microstructure and properties of austenitic heat resistant steel was investigated. The results showed that Al addition led to formation of spheroidal and dispersed Ni3Al. After solution treatment, Ni3Al particles experienced a significant refinement from 1.5 μm to nanoscale (∼80 nm). Matrix transformed from austenite to ferrite when addition of Al was >4.72%. Oxidation resistance of samples containing 4.72%Al was two times higher than Al free samples due to the formation of compacted Al2O3 scales. Excessive Al resulted in the formation of Al3Fe5O12 and AlN on oxidation surface, which destroyed the oxidation resistance. Dispersedly precipitated Ni3Al effectively supported the matrix and enhanced the wear resistance, and samples containing 4.72%Al performed,80% higher in wear resistance than Al free samples. Al significantly improved the microstructure and the properties of austenitic heat resistant steel, and samples containing 4.72%Al performed the optimal combination properties.

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author
; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat resistant steel, Microstructural evolution, NiAl, Oxidation, Wear
in
Materials Science and Technology (United Kingdom)
volume
29
issue
5
pages
6 pages
publisher
Taylor & Francis
external identifiers
  • scopus:84876935905
ISSN
0267-0836
DOI
10.1179/1743284712Y.0000000177
language
English
LU publication?
no
id
823ce8d6-18f2-4bf9-8429-9e385300d1d6
date added to LUP
2021-10-18 21:54:56
date last changed
2022-02-24 17:00:23
@article{823ce8d6-18f2-4bf9-8429-9e385300d1d6,
  abstract     = {{<p>Effect of aluminium on microstructure and properties of austenitic heat resistant steel was investigated. The results showed that Al addition led to formation of spheroidal and dispersed Ni<sub>3</sub>Al. After solution treatment, Ni<sub>3</sub>Al particles experienced a significant refinement from 1.5 μm to nanoscale (∼80 nm). Matrix transformed from austenite to ferrite when addition of Al was &gt;4.72%. Oxidation resistance of samples containing 4.72%Al was two times higher than Al free samples due to the formation of compacted Al<sub>2</sub>O<sub>3</sub> scales. Excessive Al resulted in the formation of Al<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and AlN on oxidation surface, which destroyed the oxidation resistance. Dispersedly precipitated Ni<sub>3</sub>Al effectively supported the matrix and enhanced the wear resistance, and samples containing 4.72%Al performed,80% higher in wear resistance than Al free samples. Al significantly improved the microstructure and the properties of austenitic heat resistant steel, and samples containing 4.72%Al performed the optimal combination properties.</p>}},
  author       = {{Sun, Y. F. and Lv, Y. Z. and Zhang, Y. and Zhao, J. Y. and Wu, Y.}},
  issn         = {{0267-0836}},
  keywords     = {{Heat resistant steel; Microstructural evolution; NiAl; Oxidation; Wear}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{511--516}},
  publisher    = {{Taylor & Francis}},
  series       = {{Materials Science and Technology (United Kingdom)}},
  title        = {{Microstructural and properties evolution of austenitic heat resistant steel after addition of aluminium}},
  url          = {{http://dx.doi.org/10.1179/1743284712Y.0000000177}},
  doi          = {{10.1179/1743284712Y.0000000177}},
  volume       = {{29}},
  year         = {{2013}},
}