Thermal dependence of austempering transformation kinetics of compacted graphite cast iron

The evolution of the relative fraction of high-carbon austenite with austempering time and temperature was analyzed in a compacted graphite (CG) cast iron (average composition, in wt pct: 3.40C, 2.8Si, 0.8Mn, 0.04Cu, 0.01P, and 0.02S) at five different austempering temperatures between 573 and 673 K...

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Autores principales: Laneri, Karina Fabiana, Desimoni, Judith, Mercader, Roberto Carlos, Gregorutti, Ricardo Walter, Sarutti, José Luis
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Física
Ciencias Exactas
high-carbon austenite
Mössbauer spectroscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/145265
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-145265
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
high-carbon austenite
Mössbauer spectroscopy
spellingShingle Física
Ciencias Exactas
high-carbon austenite
Mössbauer spectroscopy
Laneri, Karina Fabiana
Desimoni, Judith
Mercader, Roberto Carlos
Gregorutti, Ricardo Walter
Sarutti, José Luis
Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
topic_facet Física
Ciencias Exactas
high-carbon austenite
Mössbauer spectroscopy
description The evolution of the relative fraction of high-carbon austenite with austempering time and temperature was analyzed in a compacted graphite (CG) cast iron (average composition, in wt pct: 3.40C, 2.8Si, 0.8Mn, 0.04Cu, 0.01P, and 0.02S) at five different austempering temperatures between 573 and 673 K. Samples were characterized by Mo¨ssbauer spectroscopy, hardness measurements, and optical microscopy. During the first stage of transformation, the kinetics parameters were determined using the Johnson–Mehl’s equation, and their dependence with temperature in the range from 573 to 673 K indicates that the transformation is governed by nucleation and growth processes. The balance between growth-rate kinetics and nucleation kinetics causes the kinetics parameter (k) to have a maximum at ’623 K of 3.9 3 1023 (s21 ). The evolution of the C content in the high-carbon austenite was found to be controlled by the volume diffusion of carbon atoms from the ferrite/austenite interface into austenite, with a dependence of t 0.4060.05 on the austempering time (t).
format Articulo
Articulo
author Laneri, Karina Fabiana
Desimoni, Judith
Mercader, Roberto Carlos
Gregorutti, Ricardo Walter
Sarutti, José Luis
author_facet Laneri, Karina Fabiana
Desimoni, Judith
Mercader, Roberto Carlos
Gregorutti, Ricardo Walter
Sarutti, José Luis
author_sort Laneri, Karina Fabiana
title Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
title_short Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
title_full Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
title_fullStr Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
title_full_unstemmed Thermal dependence of austempering transformation kinetics of compacted graphite cast iron
title_sort thermal dependence of austempering transformation kinetics of compacted graphite cast iron
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/145265
work_keys_str_mv AT lanerikarinafabiana thermaldependenceofaustemperingtransformationkineticsofcompactedgraphitecastiron
AT desimonijudith thermaldependenceofaustemperingtransformationkineticsofcompactedgraphitecastiron
AT mercaderrobertocarlos thermaldependenceofaustemperingtransformationkineticsofcompactedgraphitecastiron
AT gregoruttiricardowalter thermaldependenceofaustemperingtransformationkineticsofcompactedgraphitecastiron
AT saruttijoseluis thermaldependenceofaustemperingtransformationkineticsofcompactedgraphitecastiron
bdutipo_str Repositorios
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