Abstract
Microstructural change during isothermal aging has been investigated 13%Mn-0.9%C and 22%Mn-0.6%C steels by means of optical and electron microscopy and X-ray diffractometry. High manganese austenitic steels undergo three kinds of reactions during isothermal aging; (1) grain boundary precipitation of carbide, (2) precipitation of platelet carbide within austenite (γ) grains and (3) formation of lamellar structure through eutectoid transformation (γ→ferrite (α)+carbide). In 13%Mn-0.9%C steel, all of the reactions occur and the carbide concerning the reactions is M3C in any case. On the other hand, in 22%Mn-0.6%C steel, only two of them occur; grain boundary precipitation of M23C6 carbide (not M3C) and the eutectoid transformation (γYLDα+M3C). Besides, both of the two reactions in 22%Mn-0.6%C steel were effectively suppressed due to the chemical composition; high Mn and low C content. Eutectoid transformation proceeds by being supplied carbon from untransformed γ, so that this results in the shortage of carbon in untransformed γ during isothermal aging and the γ phase undergoes γ→ε (hcp) martensitic transformation on the following cooling.
| Original language | English |
|---|---|
| Pages (from-to) | 309-314 |
| Number of pages | 6 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 84 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jan 1 1998 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry
Cite this
Microstructural change during isothermal aging in high manganese austenitic steels. / Ono, Yoshinori; Tsuchiyma, Toshihiro; Takaki, Setsuo.
In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 84, No. 4, 01.01.1998, p. 309-314.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructural change during isothermal aging in high manganese austenitic steels
AU - Ono, Yoshinori
AU - Tsuchiyma, Toshihiro
AU - Takaki, Setsuo
PY - 1998/1/1
Y1 - 1998/1/1
N2 - Microstructural change during isothermal aging has been investigated 13%Mn-0.9%C and 22%Mn-0.6%C steels by means of optical and electron microscopy and X-ray diffractometry. High manganese austenitic steels undergo three kinds of reactions during isothermal aging; (1) grain boundary precipitation of carbide, (2) precipitation of platelet carbide within austenite (γ) grains and (3) formation of lamellar structure through eutectoid transformation (γ→ferrite (α)+carbide). In 13%Mn-0.9%C steel, all of the reactions occur and the carbide concerning the reactions is M3C in any case. On the other hand, in 22%Mn-0.6%C steel, only two of them occur; grain boundary precipitation of M23C6 carbide (not M3C) and the eutectoid transformation (γYLDα+M3C). Besides, both of the two reactions in 22%Mn-0.6%C steel were effectively suppressed due to the chemical composition; high Mn and low C content. Eutectoid transformation proceeds by being supplied carbon from untransformed γ, so that this results in the shortage of carbon in untransformed γ during isothermal aging and the γ phase undergoes γ→ε (hcp) martensitic transformation on the following cooling.
AB - Microstructural change during isothermal aging has been investigated 13%Mn-0.9%C and 22%Mn-0.6%C steels by means of optical and electron microscopy and X-ray diffractometry. High manganese austenitic steels undergo three kinds of reactions during isothermal aging; (1) grain boundary precipitation of carbide, (2) precipitation of platelet carbide within austenite (γ) grains and (3) formation of lamellar structure through eutectoid transformation (γ→ferrite (α)+carbide). In 13%Mn-0.9%C steel, all of the reactions occur and the carbide concerning the reactions is M3C in any case. On the other hand, in 22%Mn-0.6%C steel, only two of them occur; grain boundary precipitation of M23C6 carbide (not M3C) and the eutectoid transformation (γYLDα+M3C). Besides, both of the two reactions in 22%Mn-0.6%C steel were effectively suppressed due to the chemical composition; high Mn and low C content. Eutectoid transformation proceeds by being supplied carbon from untransformed γ, so that this results in the shortage of carbon in untransformed γ during isothermal aging and the γ phase undergoes γ→ε (hcp) martensitic transformation on the following cooling.
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UR - http://www.scopus.com/inward/citedby.url?scp=0032045270&partnerID=8YFLogxK
U2 - 10.2355/tetsutohagane1955.84.4_309
DO - 10.2355/tetsutohagane1955.84.4_309
M3 - Article
VL - 84
SP - 309
EP - 314
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 - 4
ER -