Analysis of models for grain-impingement compensation and their effect on recrystallization kinetics

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(91)90149-U· OSTI ID:6983525

Price, C W ^[1]

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1. Lawrence Livermore National Lab., CA (United States). Chemistry and Materials Science Lab.

Compensation for grain impingement is essential in kinetic relations for recrystallization, but impingement geometry is sufficiently complex that impingement compensation can only be approximated. Impingement compensation has been treated in two different models: the Kolmogorov-Johnson-Mehl-Avrami extended-volume concept and the empirical Speich-Fisher parabolic relation between the area of the interface that separates recrystallized and unrecrystallized material and the volume fraction of recrystallized material. Although much uncertainty has existed on the efficacy of these models, their accuracy and limitations can now be analyzed in computer simulations. The simulations reveal that both models provide reasonable impingement compensation, but their limitations must be carefully defined. In the past, deviations from predicted kinetic behavior often were attributed to approximations introduced by the impingement models, but computer simulations now reveal that limitations imposed by the time dependence used to model growth are often ignored and can be a major source of confusion.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6983525
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 39:8; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
COMPUTERIZED SIMULATION
ELEMENTS
KINETICS
MATHEMATICAL MODELS
METALS
RECRYSTALLIZATION
SIMULATION