Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo

Autores
Bur, Emmanuel
Año de publicación
2024
Idioma
inglés
Tipo de recurso
tesis de grado
Estado
versión aceptada
Colaborador/a o director/a de tesis
Guitar, María Agustina
Brühl, Sonia Patricia
Descripción
High Chromium Cast Irons (HCCI) are materials widely used in industries such as mining and slurry pumping in oil extraction due to their resistance to abrasion, impact and corrosion in aggressive environments. The excellent performance of these castings is due to the combination of eutectic carbides (EC) and secondary carbides (SC) within a tough matrix, achieved by specific heat treatments that optimise the distribution and stability of the carbides. Destabilisation of the microstructure is the most used treatment for this type of material, allowing the precipitation of SC. The temperature (980°C) and time (0 to 90 min) used during the treatment will determine the size and fraction of SC, as well as the fraction of martensite and retained austenite (RA) formed during cooling. Secondary carbides were quantified using Fiji® software with high- and low-resolution SEM images. The results show that the average particle size as well as the volume fraction of SC increased as the destabilisation time increased, on the other hand, several small particles are not detected in low resolution images. We also evaluated the effect of heating rate, observing that a slower heating rate favours the precipitation and growth of SC during the heating process. These secondary carbides have direct implications on wear properties. The response to abrasive wear according to ASTM G65 with a load of 65 N and 4800 m of sliding on a HCCI containing 26 %Cr was evaluated in three different conditions, containing varying amounts of SC, RA, and martensite: as received, destabilised by zero and ninety minutes. An improvement in abrasive wear resistance was observed in the heat-treated samples, where the material with higher CS fraction and higher hardness showed the best response. On the other hand, scratch tests were performed with a diamond tip and 90 N load. The wear profile was obtained by confocal microscopy (CLSM) where cutting and ploughing was observed as an abrasive mechanism in the heat-treated samples. In the untreated samples a large plastic deformation is observed. The effect of the amount of chromium (16 % Cr and 26 % Cr) on the corrosion behaviour was evaluated by electrochemical tests using a 3.5% NaCl solution and salt spray (ASTM B117) in a 5% NaCl solution for 100 hours. Additionally, the effect of destabilisation time on corrosion resistance was evaluated with an immersion test (3.5% NaCl) for 10, 100, and 250 hours. The material with lower Cr content showed higher corrosion, even after only 10 hours of immersion.
Fil: Bur, Emmanuel. Universidad Tecnológica Nacional. Facultad Regional Concepción del Uruguay. Ingeniería Electromecánica; Argentina.
Materia
High chromium cast irons
HCCI
Eutectic carbides
Destabilization treatment
Secondary carbides
Wear
Corrosion
Nivel de accesibilidad
acceso abierto
Condiciones de uso
Cur, Emmanuel
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/11848
Acceder
id RIAUTN_1b6490acd26ba6d9370d11970bd2f03f
oai_identifier_str oai:ria.utn.edu.ar:20.500.12272/11848
network_acronym_str RIAUTN
repository_id_str a
network_name_str Repositorio Institucional Abierto (UTN)
spelling Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromoBur, EmmanuelHigh chromium cast ironsHCCIEutectic carbidesDestabilization treatmentSecondary carbidesWearCorrosionHigh Chromium Cast Irons (HCCI) are materials widely used in industries such as mining and slurry pumping in oil extraction due to their resistance to abrasion, impact and corrosion in aggressive environments. The excellent performance of these castings is due to the combination of eutectic carbides (EC) and secondary carbides (SC) within a tough matrix, achieved by specific heat treatments that optimise the distribution and stability of the carbides. Destabilisation of the microstructure is the most used treatment for this type of material, allowing the precipitation of SC. The temperature (980°C) and time (0 to 90 min) used during the treatment will determine the size and fraction of SC, as well as the fraction of martensite and retained austenite (RA) formed during cooling. Secondary carbides were quantified using Fiji® software with high- and low-resolution SEM images. The results show that the average particle size as well as the volume fraction of SC increased as the destabilisation time increased, on the other hand, several small particles are not detected in low resolution images. We also evaluated the effect of heating rate, observing that a slower heating rate favours the precipitation and growth of SC during the heating process. These secondary carbides have direct implications on wear properties. The response to abrasive wear according to ASTM G65 with a load of 65 N and 4800 m of sliding on a HCCI containing 26 %Cr was evaluated in three different conditions, containing varying amounts of SC, RA, and martensite: as received, destabilised by zero and ninety minutes. An improvement in abrasive wear resistance was observed in the heat-treated samples, where the material with higher CS fraction and higher hardness showed the best response. On the other hand, scratch tests were performed with a diamond tip and 90 N load. The wear profile was obtained by confocal microscopy (CLSM) where cutting and ploughing was observed as an abrasive mechanism in the heat-treated samples. In the untreated samples a large plastic deformation is observed. The effect of the amount of chromium (16 % Cr and 26 % Cr) on the corrosion behaviour was evaluated by electrochemical tests using a 3.5% NaCl solution and salt spray (ASTM B117) in a 5% NaCl solution for 100 hours. Additionally, the effect of destabilisation time on corrosion resistance was evaluated with an immersion test (3.5% NaCl) for 10, 100, and 250 hours. The material with lower Cr content showed higher corrosion, even after only 10 hours of immersion.Fil: Bur, Emmanuel. Universidad Tecnológica Nacional. Facultad Regional Concepción del Uruguay. Ingeniería Electromecánica; Argentina.Guitar, María AgustinaBrühl, Sonia Patricia2024-12-10T13:04:51Z2024-10-09info:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_7a1finfo:ar-repo/semantics/tesisDeGradopdfapplication/pdfhttps://hdl.handle.net/20.500.12272/11848enginfo:eu-repo/semantics/openAccessCur, EmmanuelNo comercial con fines académicos. Licencia Creative Commons CC BY-NC-SAreponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacional2026-09-24T12:46:41Zoai:ria.utn.edu.ar:20.500.12272/11848instacron:UTNInstitucionalhttp://ria.utn.edu.ar/Universidad públicaNo correspondehttp://ria.utn.edu.ar/oaigestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:a2026-09-24 12:46:42.538Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
title Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
spellingShingle Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
Bur, Emmanuel
High chromium cast irons
HCCI
Eutectic carbides
Destabilization treatment
Secondary carbides
Wear
Corrosion
title_short Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
title_full Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
title_fullStr Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
title_full_unstemmed Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
title_sort Evaluación de la precipitación de carburos, resistencia al desgaste abrasivo y a la corrosión de fundiciones de alto cromo
dc.creator.none.fl_str_mv Bur, Emmanuel
author Bur, Emmanuel
author_facet Bur, Emmanuel
author_role author
dc.contributor.none.fl_str_mv Guitar, María Agustina
Brühl, Sonia Patricia
dc.subject.none.fl_str_mv High chromium cast irons
HCCI
Eutectic carbides
Destabilization treatment
Secondary carbides
Wear
Corrosion
topic High chromium cast irons
HCCI
Eutectic carbides
Destabilization treatment
Secondary carbides
Wear
Corrosion
dc.description.none.fl_txt_mv High Chromium Cast Irons (HCCI) are materials widely used in industries such as mining and slurry pumping in oil extraction due to their resistance to abrasion, impact and corrosion in aggressive environments. The excellent performance of these castings is due to the combination of eutectic carbides (EC) and secondary carbides (SC) within a tough matrix, achieved by specific heat treatments that optimise the distribution and stability of the carbides. Destabilisation of the microstructure is the most used treatment for this type of material, allowing the precipitation of SC. The temperature (980°C) and time (0 to 90 min) used during the treatment will determine the size and fraction of SC, as well as the fraction of martensite and retained austenite (RA) formed during cooling. Secondary carbides were quantified using Fiji® software with high- and low-resolution SEM images. The results show that the average particle size as well as the volume fraction of SC increased as the destabilisation time increased, on the other hand, several small particles are not detected in low resolution images. We also evaluated the effect of heating rate, observing that a slower heating rate favours the precipitation and growth of SC during the heating process. These secondary carbides have direct implications on wear properties. The response to abrasive wear according to ASTM G65 with a load of 65 N and 4800 m of sliding on a HCCI containing 26 %Cr was evaluated in three different conditions, containing varying amounts of SC, RA, and martensite: as received, destabilised by zero and ninety minutes. An improvement in abrasive wear resistance was observed in the heat-treated samples, where the material with higher CS fraction and higher hardness showed the best response. On the other hand, scratch tests were performed with a diamond tip and 90 N load. The wear profile was obtained by confocal microscopy (CLSM) where cutting and ploughing was observed as an abrasive mechanism in the heat-treated samples. In the untreated samples a large plastic deformation is observed. The effect of the amount of chromium (16 % Cr and 26 % Cr) on the corrosion behaviour was evaluated by electrochemical tests using a 3.5% NaCl solution and salt spray (ASTM B117) in a 5% NaCl solution for 100 hours. Additionally, the effect of destabilisation time on corrosion resistance was evaluated with an immersion test (3.5% NaCl) for 10, 100, and 250 hours. The material with lower Cr content showed higher corrosion, even after only 10 hours of immersion.
Fil: Bur, Emmanuel. Universidad Tecnológica Nacional. Facultad Regional Concepción del Uruguay. Ingeniería Electromecánica; Argentina.
description High Chromium Cast Irons (HCCI) are materials widely used in industries such as mining and slurry pumping in oil extraction due to their resistance to abrasion, impact and corrosion in aggressive environments. The excellent performance of these castings is due to the combination of eutectic carbides (EC) and secondary carbides (SC) within a tough matrix, achieved by specific heat treatments that optimise the distribution and stability of the carbides. Destabilisation of the microstructure is the most used treatment for this type of material, allowing the precipitation of SC. The temperature (980°C) and time (0 to 90 min) used during the treatment will determine the size and fraction of SC, as well as the fraction of martensite and retained austenite (RA) formed during cooling. Secondary carbides were quantified using Fiji® software with high- and low-resolution SEM images. The results show that the average particle size as well as the volume fraction of SC increased as the destabilisation time increased, on the other hand, several small particles are not detected in low resolution images. We also evaluated the effect of heating rate, observing that a slower heating rate favours the precipitation and growth of SC during the heating process. These secondary carbides have direct implications on wear properties. The response to abrasive wear according to ASTM G65 with a load of 65 N and 4800 m of sliding on a HCCI containing 26 %Cr was evaluated in three different conditions, containing varying amounts of SC, RA, and martensite: as received, destabilised by zero and ninety minutes. An improvement in abrasive wear resistance was observed in the heat-treated samples, where the material with higher CS fraction and higher hardness showed the best response. On the other hand, scratch tests were performed with a diamond tip and 90 N load. The wear profile was obtained by confocal microscopy (CLSM) where cutting and ploughing was observed as an abrasive mechanism in the heat-treated samples. In the untreated samples a large plastic deformation is observed. The effect of the amount of chromium (16 % Cr and 26 % Cr) on the corrosion behaviour was evaluated by electrochemical tests using a 3.5% NaCl solution and salt spray (ASTM B117) in a 5% NaCl solution for 100 hours. Additionally, the effect of destabilisation time on corrosion resistance was evaluated with an immersion test (3.5% NaCl) for 10, 100, and 250 hours. The material with lower Cr content showed higher corrosion, even after only 10 hours of immersion.
publishDate 2024
dc.date.none.fl_str_mv 2024-12-10T13:04:51Z
2024-10-09
dc.type.none.fl_str_mv info:eu-repo/semantics/bachelorThesis
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_7a1f
info:ar-repo/semantics/tesisDeGrado
format bachelorThesis
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.12272/11848
url https://hdl.handle.net/20.500.12272/11848
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
Cur, Emmanuel
No comercial con fines académicos. Licencia Creative Commons CC BY-NC-SA
eu_rights_str_mv openAccess
rights_invalid_str_mv Cur, Emmanuel
No comercial con fines académicos. Licencia Creative Commons CC BY-NC-SA
dc.format.none.fl_str_mv pdf
application/pdf
dc.source.none.fl_str_mv reponame:Repositorio Institucional Abierto (UTN)
instname:Universidad Tecnológica Nacional
reponame_str Repositorio Institucional Abierto (UTN)
collection Repositorio Institucional Abierto (UTN)
instname_str Universidad Tecnológica Nacional
repository.name.fl_str_mv Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacional
repository.mail.fl_str_mv gestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.ar
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score 13.265058

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