Modelling of the dynamic recrystallization of austenite in low alloy and microalloyed steels

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00154-6· OSTI ID:271702

Medina, S F ^[1]; Hernandez, C A ^[2]

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1. Centro Nacional de Investigaciones Metalurgicas, Madrid (Spain)
2. Univ. Autonoma de Mexico, Mexico City (Mexico). Facultad de Quimica D

Using torsional tests in the austenite phase, the dynamic recrystallization of a selection of low alloy and microalloyed steels was studied and Avrami`s equation was modelled. The model is based on the experimental determination of flow curves and their subsequent modelling, making it possible to calculate the recrystallized fraction (X{sub d}) as a function of all the variables which intervene in hot deformation: temperature, strain rate, austenite grain size and the chemical composition of the steel. The influence of the first three variables is quantified using the Zener-Hollomon parameter where the activation energy is expressed as a function of the content of each alloy. The start of dynamic recrystallization was determined by regression, finding a value of 0.95{epsilon}{sub p}. In testing conditions all the elements were found in solution in the austenite, except Ti which was found partially precipitated. The results of these tests indicate that C, Si (low content), Mn and V have hardly any influence on the start of recrystallization while Mo, Ti and especially Nb delay it. Finally, the dynamic recrystallization kinetics are illustrated through the study of the microstructure during deformation.

• OSTI ID: 271702
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 1 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CHEMICAL COMPOSITION
DEFORMATION
DISLOCATIONS
GRAIN SIZE
KINETICS
LOW ALLOY STEELS
MATHEMATICAL MODELS
RECRYSTALLIZATION
REGRESSION ANALYSIS
STRAIN RATE
TEMPERATURE DEPENDENCE
TORSION