Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy

P. Behjati, A. Kermanpur, A. Najafizadeh, H. Samaei Baghbadorani, L. P. Karjalainen, J. G. Jung, Y. K. Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A conceptual approach was used to design a new Ni-free austenitic stainless steel with a unique combination of ultrahigh strength and ductility. The concept was based on the alloying of the 0.05C-18Cr-12Mn (wt.%) steel by 0.39%N and heavy warm rolling (84% reduction) at 1173. K (900. °C) to achieve the yield strength of minimum 1. GPa and high tensile strength and elongation due to a proper stability of the austenite as a result of the optimized stacking fault energy (SFE). The yield strength of 1010. MPa, tensile strength of 1150. MPa and high fracture strain of 70% were measured for the steel designed. Dislocation and solid solution hardening mechanisms are introduced as the main contributors for the ultrahigh yield strength of the steel. The strain hardening is gradual and the hardening rate reaches a high level of ~2400. MPa at a high true strain of 40% due to slow α'-martensitic transformation and mechanical twinning. Consequently, the ductility of the designed steel is excellent.

Original languageEnglish
Pages (from-to)500-507
Number of pages8
JournalMaterials and Design
Volume63
DOIs
Publication statusPublished - 2014 Nov 1

Fingerprint

Steel
Austenitic stainless steel
Ductility
Yield stress
Hardening
Tensile strength
Twinning
Martensitic transformations
Stacking faults
Alloying
Strain hardening
Austenite
Elongation
Solid solutions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Behjati, P., Kermanpur, A., Najafizadeh, A., Samaei Baghbadorani, H., Karjalainen, L. P., Jung, J. G., & Lee, Y. K. (2014). Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy. Materials and Design, 63, 500-507. https://doi.org/10.1016/j.matdes.2014.06.069
Behjati, P. ; Kermanpur, A. ; Najafizadeh, A. ; Samaei Baghbadorani, H. ; Karjalainen, L. P. ; Jung, J. G. ; Lee, Y. K. / Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy. In: Materials and Design. 2014 ; Vol. 63. pp. 500-507.
@article{317366d70efb4e84abdadaf92673e2d4,
title = "Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy",
abstract = "A conceptual approach was used to design a new Ni-free austenitic stainless steel with a unique combination of ultrahigh strength and ductility. The concept was based on the alloying of the 0.05C-18Cr-12Mn (wt.{\%}) steel by 0.39{\%}N and heavy warm rolling (84{\%} reduction) at 1173. K (900. °C) to achieve the yield strength of minimum 1. GPa and high tensile strength and elongation due to a proper stability of the austenite as a result of the optimized stacking fault energy (SFE). The yield strength of 1010. MPa, tensile strength of 1150. MPa and high fracture strain of 70{\%} were measured for the steel designed. Dislocation and solid solution hardening mechanisms are introduced as the main contributors for the ultrahigh yield strength of the steel. The strain hardening is gradual and the hardening rate reaches a high level of ~2400. MPa at a high true strain of 40{\%} due to slow α'-martensitic transformation and mechanical twinning. Consequently, the ductility of the designed steel is excellent.",
author = "P. Behjati and A. Kermanpur and A. Najafizadeh and {Samaei Baghbadorani}, H. and Karjalainen, {L. P.} and Jung, {J. G.} and Lee, {Y. K.}",
year = "2014",
month = "11",
day = "1",
doi = "10.1016/j.matdes.2014.06.069",
language = "English",
volume = "63",
pages = "500--507",
journal = "Materials and Design",
issn = "0264-1275",
publisher = "Elsevier BV",

}

Behjati, P, Kermanpur, A, Najafizadeh, A, Samaei Baghbadorani, H, Karjalainen, LP, Jung, JG & Lee, YK 2014, 'Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy', Materials and Design, vol. 63, pp. 500-507. https://doi.org/10.1016/j.matdes.2014.06.069

Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy. / Behjati, P.; Kermanpur, A.; Najafizadeh, A.; Samaei Baghbadorani, H.; Karjalainen, L. P.; Jung, J. G.; Lee, Y. K.

In: Materials and Design, Vol. 63, 01.11.2014, p. 500-507.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy

AU - Behjati, P.

AU - Kermanpur, A.

AU - Najafizadeh, A.

AU - Samaei Baghbadorani, H.

AU - Karjalainen, L. P.

AU - Jung, J. G.

AU - Lee, Y. K.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - A conceptual approach was used to design a new Ni-free austenitic stainless steel with a unique combination of ultrahigh strength and ductility. The concept was based on the alloying of the 0.05C-18Cr-12Mn (wt.%) steel by 0.39%N and heavy warm rolling (84% reduction) at 1173. K (900. °C) to achieve the yield strength of minimum 1. GPa and high tensile strength and elongation due to a proper stability of the austenite as a result of the optimized stacking fault energy (SFE). The yield strength of 1010. MPa, tensile strength of 1150. MPa and high fracture strain of 70% were measured for the steel designed. Dislocation and solid solution hardening mechanisms are introduced as the main contributors for the ultrahigh yield strength of the steel. The strain hardening is gradual and the hardening rate reaches a high level of ~2400. MPa at a high true strain of 40% due to slow α'-martensitic transformation and mechanical twinning. Consequently, the ductility of the designed steel is excellent.

AB - A conceptual approach was used to design a new Ni-free austenitic stainless steel with a unique combination of ultrahigh strength and ductility. The concept was based on the alloying of the 0.05C-18Cr-12Mn (wt.%) steel by 0.39%N and heavy warm rolling (84% reduction) at 1173. K (900. °C) to achieve the yield strength of minimum 1. GPa and high tensile strength and elongation due to a proper stability of the austenite as a result of the optimized stacking fault energy (SFE). The yield strength of 1010. MPa, tensile strength of 1150. MPa and high fracture strain of 70% were measured for the steel designed. Dislocation and solid solution hardening mechanisms are introduced as the main contributors for the ultrahigh yield strength of the steel. The strain hardening is gradual and the hardening rate reaches a high level of ~2400. MPa at a high true strain of 40% due to slow α'-martensitic transformation and mechanical twinning. Consequently, the ductility of the designed steel is excellent.

UR - http://www.scopus.com/inward/record.url?scp=84908140863&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84908140863&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2014.06.069

DO - 10.1016/j.matdes.2014.06.069

M3 - Article

AN - SCOPUS:84908140863

VL - 63

SP - 500

EP - 507

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

ER -

Behjati P, Kermanpur A, Najafizadeh A, Samaei Baghbadorani H, Karjalainen LP, Jung JG et al. Design of a new Ni-free austenitic stainless steel with unique ultrahigh strength-high ductility synergy. Materials and Design. 2014 Nov 1;63:500-507. https://doi.org/10.1016/j.matdes.2014.06.069