Influence of strain-induced martensite on tensile properties of metastable duplex stainless steels consisting of Fe-Cr-Mn-Ni and Fe-Cr-Mn-N

Mitsuyuki Fujisawa, Ryota Mauchi, Tatsuya Morikawa, Masaki Tanaka, Kenji Higashida

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effects of Ni or N both on the austenite stability and the tensile properties of duplex stainless steels were investigated at various temperatures. Two series of duplex stainless steel sheets consisting of Fe-(19-22)%Cr-5%Mn-(4-7)%Ni and Fe-(19-22)%Cr-5%Mn-(0.19-0.34)%N were employed. 20%Cr-5%Mn-5%Ni steel and 20%Cr-5%Mn-0.25%N steel indicated maximum improvement in elongation under tensile tests at 293 K among each series of specimens. The amount of strain-induced martensite was measured, indicating that there is the optimum transformation rate of strain-induced martensite with strain to obtain the maximum elongation under transformation-induced plasticity (TRIP). 20%Cr-5%Mn-0.25%N steel exhibited both extremely high elongation at room temperature equivalent to the conventional austenitic stainless steels of SUS304, and high tensile strength equivalent to the conventional duplex stainless steels of SUS329J4L. The total elongation of 20%Cr-5%Mn-0.25%N steel was larger than that of 20%Cr-5%Mn-5%Ni, though there is little difference between them in the average amount of strain-induced martensite introduced during the uniform deformation. The difference in elongations between 20%Cr-5%Mn-0.25%N and 20%Cr-5%Mn-5%Ni could be due to the difference in the hardness of the strain-induced martensite. The strain-induced mar-tensite in 20%Cr-5%Mn-0.25%N steel was extremely hardened by the nitrogen concentrated to the austenite phase at annealing. Such hard martensite maintained high strain-hardening rate in a wide range of strain and increased the uniform elongation with high tensile strength.

Original languageEnglish
Pages (from-to)1140-1149
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume100
Issue number9
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

tensile properties
Stainless Steel
martensite
Tensile properties
Martensite
elongation
stainless steels
Steel
Stainless steel
Elongation
steels
austenite
tensile strength
Austenite
Tensile strength
strain hardening
austenitic stainless steels
tensile tests
plastic properties
Steel sheet

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

@article{babdfdcf3feb4775af85dd988fe6a5c0,
title = "Influence of strain-induced martensite on tensile properties of metastable duplex stainless steels consisting of Fe-Cr-Mn-Ni and Fe-Cr-Mn-N",
abstract = "The effects of Ni or N both on the austenite stability and the tensile properties of duplex stainless steels were investigated at various temperatures. Two series of duplex stainless steel sheets consisting of Fe-(19-22){\%}Cr-5{\%}Mn-(4-7){\%}Ni and Fe-(19-22){\%}Cr-5{\%}Mn-(0.19-0.34){\%}N were employed. 20{\%}Cr-5{\%}Mn-5{\%}Ni steel and 20{\%}Cr-5{\%}Mn-0.25{\%}N steel indicated maximum improvement in elongation under tensile tests at 293 K among each series of specimens. The amount of strain-induced martensite was measured, indicating that there is the optimum transformation rate of strain-induced martensite with strain to obtain the maximum elongation under transformation-induced plasticity (TRIP). 20{\%}Cr-5{\%}Mn-0.25{\%}N steel exhibited both extremely high elongation at room temperature equivalent to the conventional austenitic stainless steels of SUS304, and high tensile strength equivalent to the conventional duplex stainless steels of SUS329J4L. The total elongation of 20{\%}Cr-5{\%}Mn-0.25{\%}N steel was larger than that of 20{\%}Cr-5{\%}Mn-5{\%}Ni, though there is little difference between them in the average amount of strain-induced martensite introduced during the uniform deformation. The difference in elongations between 20{\%}Cr-5{\%}Mn-0.25{\%}N and 20{\%}Cr-5{\%}Mn-5{\%}Ni could be due to the difference in the hardness of the strain-induced martensite. The strain-induced mar-tensite in 20{\%}Cr-5{\%}Mn-0.25{\%}N steel was extremely hardened by the nitrogen concentrated to the austenite phase at annealing. Such hard martensite maintained high strain-hardening rate in a wide range of strain and increased the uniform elongation with high tensile strength.",
author = "Mitsuyuki Fujisawa and Ryota Mauchi and Tatsuya Morikawa and Masaki Tanaka and Kenji Higashida",
year = "2014",
month = "1",
day = "1",
doi = "10.2355/tetsutohagane.100.1140",
language = "English",
volume = "100",
pages = "1140--1149",
journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",
issn = "0021-1575",
publisher = "一般社団法人 日本鉄鋼協会",
number = "9",

}

TY - JOUR

T1 - Influence of strain-induced martensite on tensile properties of metastable duplex stainless steels consisting of Fe-Cr-Mn-Ni and Fe-Cr-Mn-N

AU - Fujisawa, Mitsuyuki

AU - Mauchi, Ryota

AU - Morikawa, Tatsuya

AU - Tanaka, Masaki

AU - Higashida, Kenji

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The effects of Ni or N both on the austenite stability and the tensile properties of duplex stainless steels were investigated at various temperatures. Two series of duplex stainless steel sheets consisting of Fe-(19-22)%Cr-5%Mn-(4-7)%Ni and Fe-(19-22)%Cr-5%Mn-(0.19-0.34)%N were employed. 20%Cr-5%Mn-5%Ni steel and 20%Cr-5%Mn-0.25%N steel indicated maximum improvement in elongation under tensile tests at 293 K among each series of specimens. The amount of strain-induced martensite was measured, indicating that there is the optimum transformation rate of strain-induced martensite with strain to obtain the maximum elongation under transformation-induced plasticity (TRIP). 20%Cr-5%Mn-0.25%N steel exhibited both extremely high elongation at room temperature equivalent to the conventional austenitic stainless steels of SUS304, and high tensile strength equivalent to the conventional duplex stainless steels of SUS329J4L. The total elongation of 20%Cr-5%Mn-0.25%N steel was larger than that of 20%Cr-5%Mn-5%Ni, though there is little difference between them in the average amount of strain-induced martensite introduced during the uniform deformation. The difference in elongations between 20%Cr-5%Mn-0.25%N and 20%Cr-5%Mn-5%Ni could be due to the difference in the hardness of the strain-induced martensite. The strain-induced mar-tensite in 20%Cr-5%Mn-0.25%N steel was extremely hardened by the nitrogen concentrated to the austenite phase at annealing. Such hard martensite maintained high strain-hardening rate in a wide range of strain and increased the uniform elongation with high tensile strength.

AB - The effects of Ni or N both on the austenite stability and the tensile properties of duplex stainless steels were investigated at various temperatures. Two series of duplex stainless steel sheets consisting of Fe-(19-22)%Cr-5%Mn-(4-7)%Ni and Fe-(19-22)%Cr-5%Mn-(0.19-0.34)%N were employed. 20%Cr-5%Mn-5%Ni steel and 20%Cr-5%Mn-0.25%N steel indicated maximum improvement in elongation under tensile tests at 293 K among each series of specimens. The amount of strain-induced martensite was measured, indicating that there is the optimum transformation rate of strain-induced martensite with strain to obtain the maximum elongation under transformation-induced plasticity (TRIP). 20%Cr-5%Mn-0.25%N steel exhibited both extremely high elongation at room temperature equivalent to the conventional austenitic stainless steels of SUS304, and high tensile strength equivalent to the conventional duplex stainless steels of SUS329J4L. The total elongation of 20%Cr-5%Mn-0.25%N steel was larger than that of 20%Cr-5%Mn-5%Ni, though there is little difference between them in the average amount of strain-induced martensite introduced during the uniform deformation. The difference in elongations between 20%Cr-5%Mn-0.25%N and 20%Cr-5%Mn-5%Ni could be due to the difference in the hardness of the strain-induced martensite. The strain-induced mar-tensite in 20%Cr-5%Mn-0.25%N steel was extremely hardened by the nitrogen concentrated to the austenite phase at annealing. Such hard martensite maintained high strain-hardening rate in a wide range of strain and increased the uniform elongation with high tensile strength.

UR - http://www.scopus.com/inward/record.url?scp=84906963031&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84906963031&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.100.1140

DO - 10.2355/tetsutohagane.100.1140

M3 - Article

VL - 100

SP - 1140

EP - 1149

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 9

ER -