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Master's Dissertation
DOI
10.11606/D.18.1995.tde-16012012-113013
Document
Author
Full name
Decio Cardoso da Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1995
Supervisor
Committee
Rollo, João Manuel Domingos de Almeida (President)
Gomes, Samuel Irati Novaes
Zavaglia, Cecília Amélia de Carvalho
Title in Portuguese
Influência do tratamento de homogeneização sobre o bandeamento microestrutural em aços de construção mecânica
Keywords in Portuguese
Aços de construção mecânica - bandeamento
Tratamento térmico - homogeneização
Abstract in Portuguese
Os aços de construção mecânica, estão sujeitos a bandeamento microestrutural. Microestruturas bandeadas em aços ao carbono e aços de baixa liga são consequência da microssegregação de elementos de liga gue ocorreu durante a solidificação do lingote original. O tratamento mecânico a quente subsequente, alinha a dendrita primária e após resfriamento, os produtos de transformação, guardarão o mesmo alinhamento. Esta microestrutura é prejudicial quando presente em barras laminadas a quente. Para o aço estudado, SAE 8620 laminado, apresentando uma microestrutura bandeada, foi desenvolvido um ciclo de tratamento de homogeneização com a finalidade de remover esta estrutura e após, as amostras homogeneizadas foram normalizadas para eliminar o superaquecimento consequente. É possivel, eliminar o bandeamento em aços ao carbono e aços de baixa liga mediante ciclos usuais de tratamento térmico.
Title in English
Influence of homogenization treatment on the microstructural banding in steel mechanical construction
Keywords in English
Homogenization - heat treatment
Mechanical constructional steel - banding
Abstract in English
The mechanical construational steels, are subject microstuctural banding. Banding microstructure in wrought carbon and low alloy steels is consequence of the microsegregation of alloying elements which occurred during the solidification of the original lingot. Subsequent hot work process aligns the former dendrite and after cooling, the transformed products will keep the same tipical alignment. This microstructure is deletérias when present in the hot rolled bars. The steel tipe studied was, SAE 8620, hot rolled and showing a banded structure. A homogenization treatment cicie was developed, to remove this banding. Normalizing heat treatment carried ou t to eliminate the resultant overheating in the homogenized samples. It! s possible to eliminate the banding in low alloy steel and carbon steel finished by means of usually heat treatment.
 
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Publishing Date
2012-01-17
 
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