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Improvement of mechanical properties in SUS304L steel through the control of bimodal microstructure characteristics

Zhang, Zhe; Vajpai, Sanjay Kumar; Orlov, Dmitry and Ameyama, Kei (2014) In Materials Science & Engineering: A 598. p.106-113
Abstract

The present work deals with achieving improvement in the mechanical properties of SUS304L stainless steel through the application of a unique microstructure design termed as 'Harmonic structure', and establishing a co-relationship between various microstructural characteristics and mechanical properties. Harmonic structure essentially means a bimodal grain size distribution with a specific periodic arrangement of coarse- and ultrafine-grain fractions. SUS304L stainless steel samples having such microstructure were fabricated by a powder metallurgy route involving the mechanical milling of pre-alloyed steel powder followed by spark plasma sintering. Due to these peculiar microstructural characteristics, the harmonic-structured SUS304L... (More)

The present work deals with achieving improvement in the mechanical properties of SUS304L stainless steel through the application of a unique microstructure design termed as 'Harmonic structure', and establishing a co-relationship between various microstructural characteristics and mechanical properties. Harmonic structure essentially means a bimodal grain size distribution with a specific periodic arrangement of coarse- and ultrafine-grain fractions. SUS304L stainless steel samples having such microstructure were fabricated by a powder metallurgy route involving the mechanical milling of pre-alloyed steel powder followed by spark plasma sintering. Due to these peculiar microstructural characteristics, the harmonic-structured SUS304L stainless steels demonstrated a winning combination of high strength, large uniform elongation, and large total elongation to failure, simultaneously. It was also found that the fraction of a shell area (a three-dimensional continuously connected network of ultrafine-grained structure) is an important parameter controlling the balance of the mechanical properties of the harmonic-structured SUS304L steel compacts.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bimodal grain structure, Harmonic structure, Mechanical property, Microstructure design, Stainless steel
in
Materials Science & Engineering: A
volume
598
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:84893368534
ISSN
0921-5093
DOI
10.1016/j.msea.2014.01.023
language
English
LU publication?
no
id
01c2f258-273c-4ba1-a83c-0d423a4e5aba
date added to LUP
2016-06-20 15:57:39
date last changed
2017-11-05 05:04:36
@article{01c2f258-273c-4ba1-a83c-0d423a4e5aba,
  abstract     = {<p>The present work deals with achieving improvement in the mechanical properties of SUS304L stainless steel through the application of a unique microstructure design termed as 'Harmonic structure', and establishing a co-relationship between various microstructural characteristics and mechanical properties. Harmonic structure essentially means a bimodal grain size distribution with a specific periodic arrangement of coarse- and ultrafine-grain fractions. SUS304L stainless steel samples having such microstructure were fabricated by a powder metallurgy route involving the mechanical milling of pre-alloyed steel powder followed by spark plasma sintering. Due to these peculiar microstructural characteristics, the harmonic-structured SUS304L stainless steels demonstrated a winning combination of high strength, large uniform elongation, and large total elongation to failure, simultaneously. It was also found that the fraction of a shell area (a three-dimensional continuously connected network of ultrafine-grained structure) is an important parameter controlling the balance of the mechanical properties of the harmonic-structured SUS304L steel compacts.</p>},
  author       = {Zhang, Zhe and Vajpai, Sanjay Kumar and Orlov, Dmitry and Ameyama, Kei},
  issn         = {0921-5093},
  keyword      = {Bimodal grain structure,Harmonic structure,Mechanical property,Microstructure design,Stainless steel},
  language     = {eng},
  month        = {03},
  pages        = {106--113},
  publisher    = {Elsevier},
  series       = {Materials Science & Engineering: A},
  title        = {Improvement of mechanical properties in SUS304L steel through the control of bimodal microstructure characteristics},
  url          = {http://dx.doi.org/10.1016/j.msea.2014.01.023},
  volume       = {598},
  year         = {2014},
}