Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures

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In nodular cast iron molybdenum is alloyed in the range of 0.5 wt.-% to 1.5 wt.-% to increase the mechanical properties for high temperature application, especially for thick-walled castings like housings of gas or steam turbines. The behaviour of Mo-precipitations in the as cast state as well as un...

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Autores principales: Dekker, L., Tonn, B.
Formato: Other
Lenguaje:Inglés
Publicado: INTEMA - UNMdP-CONICET 2014
Materias:
Ductile Iron
High-Temperature Application
Molybdenum
Ostwald-Ripening
Acceso en línea:http://rinfi.fi.mdp.edu.ar/handle/123456789/41
Aporte de:
RINFI - Facultad de Ingeniería (UNMdP) de Universidad Nacional de Mar del Plata (UNMdP)
id I29-R182-123456789-41
record_format dspace
spelling I29-R182-123456789-412024-07-05T13:34:39Z Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures Dekker, L. Tonn, B. Ductile Iron High-Temperature Application Molybdenum Ostwald-Ripening In nodular cast iron molybdenum is alloyed in the range of 0.5 wt.-% to 1.5 wt.-% to increase the mechanical properties for high temperature application, especially for thick-walled castings like housings of gas or steam turbines. The behaviour of Mo-precipitations in the as cast state as well as under long exposure to heat was the object of this investigation. In the as-cast state Mo forms metastable carbidic grain-boundary precipitations with iron, silicon and carbon. These transform into stable MoC precipitations during sustained temperature influence. Furthermore, there are finely dispersed Mo-containing precipitations found in the matrix. These increase the high temperature strength of Mo-alloyed cast iron due to the Orowan mechanism and the occurrence of additional grain boundaries. However, it has been shown that these Mo-containing precipitations underlie Ostwald ripening under continuous heat exposure and a precipitation free area occurs along the ferritic grain boundary. 2014-11-13 Other 10 Th International Symposium on the Science and Processing of Cast Iron. 2014. Argentina: Mar del Plata 10 to 13th of November. 978-987-45833-0-7 http://rinfi.fi.mdp.edu.ar/handle/123456789/41 en INTEMA - UNMdP-CONICET
institution Universidad Nacional de Mar del Plata (UNMdP)
institution_str I-29
repository_str R-182
collection RINFI - Facultad de Ingeniería (UNMdP)
language Inglés
topic Ductile Iron
High-Temperature Application
Molybdenum
Ostwald-Ripening
spellingShingle Ductile Iron
High-Temperature Application
Molybdenum
Ostwald-Ripening
Dekker, L.
Tonn, B.
Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
topic_facet Ductile Iron
High-Temperature Application
Molybdenum
Ostwald-Ripening
description In nodular cast iron molybdenum is alloyed in the range of 0.5 wt.-% to 1.5 wt.-% to increase the mechanical properties for high temperature application, especially for thick-walled castings like housings of gas or steam turbines. The behaviour of Mo-precipitations in the as cast state as well as under long exposure to heat was the object of this investigation. In the as-cast state Mo forms metastable carbidic grain-boundary precipitations with iron, silicon and carbon. These transform into stable MoC precipitations during sustained temperature influence. Furthermore, there are finely dispersed Mo-containing precipitations found in the matrix. These increase the high temperature strength of Mo-alloyed cast iron due to the Orowan mechanism and the occurrence of additional grain boundaries. However, it has been shown that these Mo-containing precipitations underlie Ostwald ripening under continuous heat exposure and a precipitation free area occurs along the ferritic grain boundary.
format Other
author Dekker, L.
Tonn, B.
author_facet Dekker, L.
Tonn, B.
author_sort Dekker, L.
title Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
title_short Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
title_full Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
title_fullStr Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
title_full_unstemmed Occurrence and Behavior of Mo-Containing Precipitations in Nodular Cast Iron at High Temperatures
title_sort occurrence and behavior of mo-containing precipitations in nodular cast iron at high temperatures
publisher INTEMA - UNMdP-CONICET
publishDate 2014
url http://rinfi.fi.mdp.edu.ar/handle/123456789/41
work_keys_str_mv AT dekkerl occurrenceandbehaviorofmocontainingprecipitationsinnodularcastironathightemperatures
AT tonnb occurrenceandbehaviorofmocontainingprecipitationsinnodularcastironathightemperatures
_version_ 1807948737248493568

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