Conversional model of transformation strain to phase fraction in low alloy steels

S. J. Lee, M. T. Lusk, Y. K. Lee

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Computational models of austenite decomposition are widely used to predict external shape and internal microstructural changes as functions of time and temperature. One modeling approach involves converting the measured transformation strain to phase fractions using the lattice parameters of parent and product phases, because the transformation strain is caused by crystal structural change and an enrichment/depletion of the solute atoms in solid solution. A conversional model of transformation strains occurring during austenite decomposition to phase fractions was developed using an optimal set of lattice parameters and thermal expansion coefficients of each phase associated with low alloy steels. The model is composed of four different transformation strain formulae for ferrite, pearlite, bainite and martensite transformations, respectively, and can be applied to continuous cooling transformations as well as isothermal ones. The conversional model demonstrated a good match between calculated and measured phase fractions of industrial low alloy steels cooled at the different rates after austenitization.

Original languageEnglish
Pages (from-to)875-882
Number of pages8
JournalActa Materialia
Volume55
Issue number3
DOIs
Publication statusPublished - 2007 Feb 1

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High strength steel
Austenite
Lattice constants
Decomposition
Bainite
Pearlite
Martensite
Thermal expansion
Ferrite
Solid solutions
Cooling
Atoms
Crystals
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

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Conversional model of transformation strain to phase fraction in low alloy steels. / Lee, S. J.; Lusk, M. T.; Lee, Y. K.

In: Acta Materialia, Vol. 55, No. 3, 01.02.2007, p. 875-882.

Research output: Contribution to journalArticle

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