Isothermal transformation behaviour in 12%Cr-0.3%C steel with partial solution treatment

H. Inaba, M. Mikami, Y. Ono, Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

12mass%Cr-0.3mass%C steel was subjected to partial solution (PS) treatment in the two-phase region of austenite (γ)+M23C6 carbide, and then isothermally transformed to ferrite (α)+carbide at around 1000K. The isothermal decomposition behaviour of γ has been investigated by means of hardness testing and microstructural observation. Time-Temperature-Transformation diagram obtained by hardness testing showed that the decomposition of γ starts much faster in the PS-treated specimens than the specimens which have been subjected to the full solution treatment in the γ single phase region, because a lot of insoluble carbide particles dispersed within γ grains provide the precipitation sites for the carbide in the subsequent isothermal decomposition treatment. Upon the decomposition of γ in the PS-treated specimens, carbide precipitates on the insoluble carbide in the made of "in-situ" type, and α nucleates simultaneously at the carbon depleted γ region adjacent to the carbide particles by the eutoctoid transformation mechanism. In this transformation, insoluble carbide particles always work as precipitation sites for carbide, hence, typical lamellar structure is not formed but equiaxed α structure is formed around spherical carbide particles which have previously dispersed in the γ matrix at a PS-treatment temperature.

Original languageEnglish
Pages (from-to)613-618
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume87
Issue number9
DOIs
Publication statusPublished - Jan 1 2001

Fingerprint

carbides
Carbon steel
Carbides
steels
Hardness testing
Decomposition
decomposition
hardness
Lamellar structures
austenite
Austenite
Ferrite
Precipitates
ferrites
precipitates
Carbon
diagrams
Temperature
temperature
carbon

All Science Journal Classification (ASJC) codes

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

Cite this

Isothermal transformation behaviour in 12%Cr-0.3%C steel with partial solution treatment. / Inaba, H.; Mikami, M.; Ono, Y.; Tsuchiyma, Toshihiro; Takaki, Setsuo.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 87, No. 9, 01.01.2001, p. 613-618.

Research output: Contribution to journalArticle

@article{14bae5b643ef4de0a230782aa92e6a9f,
title = "Isothermal transformation behaviour in 12{\%}Cr-0.3{\%}C steel with partial solution treatment",
abstract = "12mass{\%}Cr-0.3mass{\%}C steel was subjected to partial solution (PS) treatment in the two-phase region of austenite (γ)+M23C6 carbide, and then isothermally transformed to ferrite (α)+carbide at around 1000K. The isothermal decomposition behaviour of γ has been investigated by means of hardness testing and microstructural observation. Time-Temperature-Transformation diagram obtained by hardness testing showed that the decomposition of γ starts much faster in the PS-treated specimens than the specimens which have been subjected to the full solution treatment in the γ single phase region, because a lot of insoluble carbide particles dispersed within γ grains provide the precipitation sites for the carbide in the subsequent isothermal decomposition treatment. Upon the decomposition of γ in the PS-treated specimens, carbide precipitates on the insoluble carbide in the made of {"}in-situ{"} type, and α nucleates simultaneously at the carbon depleted γ region adjacent to the carbide particles by the eutoctoid transformation mechanism. In this transformation, insoluble carbide particles always work as precipitation sites for carbide, hence, typical lamellar structure is not formed but equiaxed α structure is formed around spherical carbide particles which have previously dispersed in the γ matrix at a PS-treatment temperature.",
author = "H. Inaba and M. Mikami and Y. Ono and Toshihiro Tsuchiyma and Setsuo Takaki",
year = "2001",
month = "1",
day = "1",
doi = "10.2355/tetsutohagane1955.87.9_613",
language = "English",
volume = "87",
pages = "613--618",
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 - Isothermal transformation behaviour in 12%Cr-0.3%C steel with partial solution treatment

AU - Inaba, H.

AU - Mikami, M.

AU - Ono, Y.

AU - Tsuchiyma, Toshihiro

AU - Takaki, Setsuo

PY - 2001/1/1

Y1 - 2001/1/1

N2 - 12mass%Cr-0.3mass%C steel was subjected to partial solution (PS) treatment in the two-phase region of austenite (γ)+M23C6 carbide, and then isothermally transformed to ferrite (α)+carbide at around 1000K. The isothermal decomposition behaviour of γ has been investigated by means of hardness testing and microstructural observation. Time-Temperature-Transformation diagram obtained by hardness testing showed that the decomposition of γ starts much faster in the PS-treated specimens than the specimens which have been subjected to the full solution treatment in the γ single phase region, because a lot of insoluble carbide particles dispersed within γ grains provide the precipitation sites for the carbide in the subsequent isothermal decomposition treatment. Upon the decomposition of γ in the PS-treated specimens, carbide precipitates on the insoluble carbide in the made of "in-situ" type, and α nucleates simultaneously at the carbon depleted γ region adjacent to the carbide particles by the eutoctoid transformation mechanism. In this transformation, insoluble carbide particles always work as precipitation sites for carbide, hence, typical lamellar structure is not formed but equiaxed α structure is formed around spherical carbide particles which have previously dispersed in the γ matrix at a PS-treatment temperature.

AB - 12mass%Cr-0.3mass%C steel was subjected to partial solution (PS) treatment in the two-phase region of austenite (γ)+M23C6 carbide, and then isothermally transformed to ferrite (α)+carbide at around 1000K. The isothermal decomposition behaviour of γ has been investigated by means of hardness testing and microstructural observation. Time-Temperature-Transformation diagram obtained by hardness testing showed that the decomposition of γ starts much faster in the PS-treated specimens than the specimens which have been subjected to the full solution treatment in the γ single phase region, because a lot of insoluble carbide particles dispersed within γ grains provide the precipitation sites for the carbide in the subsequent isothermal decomposition treatment. Upon the decomposition of γ in the PS-treated specimens, carbide precipitates on the insoluble carbide in the made of "in-situ" type, and α nucleates simultaneously at the carbon depleted γ region adjacent to the carbide particles by the eutoctoid transformation mechanism. In this transformation, insoluble carbide particles always work as precipitation sites for carbide, hence, typical lamellar structure is not formed but equiaxed α structure is formed around spherical carbide particles which have previously dispersed in the γ matrix at a PS-treatment temperature.

UR - http://www.scopus.com/inward/record.url?scp=0035440725&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035440725&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane1955.87.9_613

DO - 10.2355/tetsutohagane1955.87.9_613

M3 - Article

VL - 87

SP - 613

EP - 618

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 -