Thermodynamic prediction of the eutectoid transformation temperatures of low-alloy steels

Young-Kook Lee, Mark T. Lusk

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The experimental eutectoid transformation temperatures (A1) of low-alloy steels, as reported in the USS Atlas of I-T diagrams, have been compared to the thermodynamic predictions of a model proposed by Kirkaldy and Venugopalan. The analysis is consistent with the model prediction that Cr atoms are almost fully partitioned, while Ni and Mo atoms are scarcely partitioned, during the eutectoid transformation. This study also shows that Mn atoms are partitioned fully or partly in C-Mn, Cr-Mn, and Mo-Mn steels, while they are scarcely partitioned in Ni-Mn steels. The difference (ΔT) between the orthoequilibrium (OE) eutectoid temperature (Ae1) and the paraequilibrium (PE) eutectoid temperature (Ap1) has been investigated as a function of the content of each substitutional alloying element. The slope of ΔT increases with substitutions of Mo, Ni, Mn, Si, and Cr, with Mo having the least effect, Ni the next-greatest effect, and so on. Considering both Mn partitioning and the slope of ΔT, the equation for the prediction of A1 temperatures of low-alloy steels proposed by Kirkaldy and Venugopalan is modified. This new equation is in better agreement with the experimental A1 temperatures.

Original languageEnglish
Pages (from-to)2325-2330
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume30
Issue number9
DOIs
Publication statusPublished - 1999 Jan 1

Fingerprint

high strength steels
High strength steel
Thermodynamics
thermodynamics
predictions
Steel
Atoms
Temperature
temperature
steels
slopes
atoms
Alloying elements
alloying
Substitution reactions
diagrams
substitutes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

@article{e6cae4db8dd04598bfeabfb07f09a791,
title = "Thermodynamic prediction of the eutectoid transformation temperatures of low-alloy steels",
abstract = "The experimental eutectoid transformation temperatures (A1) of low-alloy steels, as reported in the USS Atlas of I-T diagrams, have been compared to the thermodynamic predictions of a model proposed by Kirkaldy and Venugopalan. The analysis is consistent with the model prediction that Cr atoms are almost fully partitioned, while Ni and Mo atoms are scarcely partitioned, during the eutectoid transformation. This study also shows that Mn atoms are partitioned fully or partly in C-Mn, Cr-Mn, and Mo-Mn steels, while they are scarcely partitioned in Ni-Mn steels. The difference (ΔT) between the orthoequilibrium (OE) eutectoid temperature (Ae1) and the paraequilibrium (PE) eutectoid temperature (Ap1) has been investigated as a function of the content of each substitutional alloying element. The slope of ΔT increases with substitutions of Mo, Ni, Mn, Si, and Cr, with Mo having the least effect, Ni the next-greatest effect, and so on. Considering both Mn partitioning and the slope of ΔT, the equation for the prediction of A1 temperatures of low-alloy steels proposed by Kirkaldy and Venugopalan is modified. This new equation is in better agreement with the experimental A1 temperatures.",
author = "Young-Kook Lee and Lusk, {Mark T.}",
year = "1999",
month = "1",
day = "1",
doi = "10.1007/s11661-999-0241-3",
language = "English",
volume = "30",
pages = "2325--2330",
journal = "Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science",
issn = "1073-5623",
publisher = "Springer Boston",
number = "9",

}

TY - JOUR

T1 - Thermodynamic prediction of the eutectoid transformation temperatures of low-alloy steels

AU - Lee, Young-Kook

AU - Lusk, Mark T.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The experimental eutectoid transformation temperatures (A1) of low-alloy steels, as reported in the USS Atlas of I-T diagrams, have been compared to the thermodynamic predictions of a model proposed by Kirkaldy and Venugopalan. The analysis is consistent with the model prediction that Cr atoms are almost fully partitioned, while Ni and Mo atoms are scarcely partitioned, during the eutectoid transformation. This study also shows that Mn atoms are partitioned fully or partly in C-Mn, Cr-Mn, and Mo-Mn steels, while they are scarcely partitioned in Ni-Mn steels. The difference (ΔT) between the orthoequilibrium (OE) eutectoid temperature (Ae1) and the paraequilibrium (PE) eutectoid temperature (Ap1) has been investigated as a function of the content of each substitutional alloying element. The slope of ΔT increases with substitutions of Mo, Ni, Mn, Si, and Cr, with Mo having the least effect, Ni the next-greatest effect, and so on. Considering both Mn partitioning and the slope of ΔT, the equation for the prediction of A1 temperatures of low-alloy steels proposed by Kirkaldy and Venugopalan is modified. This new equation is in better agreement with the experimental A1 temperatures.

AB - The experimental eutectoid transformation temperatures (A1) of low-alloy steels, as reported in the USS Atlas of I-T diagrams, have been compared to the thermodynamic predictions of a model proposed by Kirkaldy and Venugopalan. The analysis is consistent with the model prediction that Cr atoms are almost fully partitioned, while Ni and Mo atoms are scarcely partitioned, during the eutectoid transformation. This study also shows that Mn atoms are partitioned fully or partly in C-Mn, Cr-Mn, and Mo-Mn steels, while they are scarcely partitioned in Ni-Mn steels. The difference (ΔT) between the orthoequilibrium (OE) eutectoid temperature (Ae1) and the paraequilibrium (PE) eutectoid temperature (Ap1) has been investigated as a function of the content of each substitutional alloying element. The slope of ΔT increases with substitutions of Mo, Ni, Mn, Si, and Cr, with Mo having the least effect, Ni the next-greatest effect, and so on. Considering both Mn partitioning and the slope of ΔT, the equation for the prediction of A1 temperatures of low-alloy steels proposed by Kirkaldy and Venugopalan is modified. This new equation is in better agreement with the experimental A1 temperatures.

UR - http://www.scopus.com/inward/record.url?scp=0033185562&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033185562&partnerID=8YFLogxK

U2 - 10.1007/s11661-999-0241-3

DO - 10.1007/s11661-999-0241-3

M3 - Article

VL - 30

SP - 2325

EP - 2330

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

SN - 1073-5623

IS - 9

ER -