Effect of austenite grain size on martensitic transformation of a low alloy steel

Seok Jae Lee, Young Kook Lee

Research output: Contribution to journalConference article

80 Citations (Scopus)

Abstract

There are many empirical equations for predicting martensite start temperature (Ms) and the kinetics models of martensitic transformation of plain carbon and low alloy steels. The Ms temperature equations are only dependent upon the chemistry, while the martensite transformation kinetics models are based on the degree of undercooling below Ms temperature. However, the prior austenite grain size (AGS) is also expected to influence both Ms temperature and martensite transformation kinetics as it does in diffusive transformations. In this study, therefore, both Ms temperature and martensite transformation kinetics of a low alloy steel with different austenite grain sizes were investigated using a dilatometer. The new Ms equation and martensite transformation kinetics model including the AGS effect are proposed.

Original languageEnglish
Pages (from-to)3169-3172
Number of pages4
JournalMaterials Science Forum
Volume475-479
Issue numberIV
Publication statusPublished - 2005 Apr 25

Fingerprint

high strength steels
Martensitic transformations
martensitic transformation
austenite
martensite
High strength steel
Martensite
Austenite
grain size
Temperature
Kinetics
temperature
kinetics
extensometers
Undercooling
Dilatometers
supercooling
plains
Carbon
chemistry

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "There are many empirical equations for predicting martensite start temperature (Ms) and the kinetics models of martensitic transformation of plain carbon and low alloy steels. The Ms temperature equations are only dependent upon the chemistry, while the martensite transformation kinetics models are based on the degree of undercooling below Ms temperature. However, the prior austenite grain size (AGS) is also expected to influence both Ms temperature and martensite transformation kinetics as it does in diffusive transformations. In this study, therefore, both Ms temperature and martensite transformation kinetics of a low alloy steel with different austenite grain sizes were investigated using a dilatometer. The new Ms equation and martensite transformation kinetics model including the AGS effect are proposed.",
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Effect of austenite grain size on martensitic transformation of a low alloy steel. / Lee, Seok Jae; Lee, Young Kook.

In: Materials Science Forum, Vol. 475-479, No. IV, 25.04.2005, p. 3169-3172.

Research output: Contribution to journalConference article

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AB - There are many empirical equations for predicting martensite start temperature (Ms) and the kinetics models of martensitic transformation of plain carbon and low alloy steels. The Ms temperature equations are only dependent upon the chemistry, while the martensite transformation kinetics models are based on the degree of undercooling below Ms temperature. However, the prior austenite grain size (AGS) is also expected to influence both Ms temperature and martensite transformation kinetics as it does in diffusive transformations. In this study, therefore, both Ms temperature and martensite transformation kinetics of a low alloy steel with different austenite grain sizes were investigated using a dilatometer. The new Ms equation and martensite transformation kinetics model including the AGS effect are proposed.

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