Título: | CORRELATION BETWEEN MICROSTRUCTURE AND FATIGUE LIFE IN NODULAR CAST IRONS | ||||||||||||||||||||||||||||||||||||
Autor: |
ALIXANDRE COELHO BAPTISTA |
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Colaborador(es): |
MARCOS VENICIUS SOARES PEREIRA - Orientador |
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Catalogação: | 15/JUN/2005 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=6576&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=6576&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.6576 | ||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||
The objective of the present work was to evaluate the
fatigue life of two nodular cast
irons with metallurgical modifications and resulting in
ferritic and perlitic different classes of
material. Initially, samples of both materials were cast in
sand moulds adopting the
standard Y-block geometry. In the sequence, tensile and
fatigue specimens were
machined from the ferritic and perlitic samples. After the
tensile and hardness tests, the
microstructure of the both materials were analyzed by
qualitative and quantitative
metallography, aiming to characterize their metallurgical
aspects as content, distribution
and class of graphite nodules, as well as the contents of
the ferritic and perlitic matrix.
Following the metallurgical characterization, rolating bend
fatigue tests were performed in
order to estabilish the stress-life curves of the ferritic
and perlitic nodular cast irons.
Regarding the fatigue resistance, the specimens machined
from the perlitic nodular
sample showed a longer fatigue life than that related to
the ferritic nodular specimens. The
longer fatigue life of the perlitic nodular specimens was
associated with a higher
microhardness of the perlitic matrix and the preserve of
the bull`s-eye structure. Finally,
the experimental stress-life curves of the ferritic and
perlitic nodular cast irons were
modeled adopting the Coffin-Manson law, which was
considered efficient in fitting
experimental fatigue life data of both materials.
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