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Master's Dissertation
DOI
https://doi.org/10.11606/D.88.2010.tde-06012011-091204
Document
Author
Full name
Stênio Cristaldo Heck
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2010
Supervisor
Committee
Casteletti, Luiz Carlos (President)
Maluf, Omar
Picon, Carlos Alberto
Title in Portuguese
Influência da boretação com pó na resistência ao desgaste, corrosão e oxidação dos aços AISI 1060 e AISI H13
Keywords in Portuguese
AISI 1060
AISI H13
boretação com pó
corrosão e oxidação
desgaste
Abstract in Portuguese
Neste trabalho estudou-se o efeito do tratamento de boretação na resistência ao desgaste, corrosão e oxidação dos aços AISI 1060 e AISI H13. As amostras dos aços foram boretadas com pó a 900 e 1000°C por 2 e 4 horas. Foram realizados ensaios de microdesgaste em máquina do tipo esfera fixa, sem uso de abrasivos, nas amostras boretadas e não boretadas. A resistência à corrosão, das amostras boretadas e não boretadas, em HCl 0.1M foi avaliada por ensaios de polarização potenciodinâmica. Ensaios de oxidação do tipo quase-isotérmica foram realizados nas amostras, utilizando temperatura de 550°C ao ar. Para todas as condições de tratamento empregadas foram formadas camadas de boretos com elevadas durezas sobre os substratos. As propriedades das camadas como dureza, espessura, morfologia da interface camada/substrato e as fases presentes, foram influenciadas pelas composições dos aços. No caso do aço AISI H13, que possui maior quantidade de elementos de liga, as camadas formadas foram mais duras, menos espessas, com interface lisa, e para todas as condições de tratamento foram formadas os compostos de boro Fe2B, FeB e CrB. Já no aço AISI 1060 as interfaces camada/substrato foram do tipo dentada e para a temperatura de boretação de 900°C apenas a fase Fe2B foi formada, aparecendo o FeB a partir da temperatura de boretação de 1000°C. A resistência ao desgaste, corrosão e oxidação dos aços boretados aumentou significativamente, sendo que em relação ao desgaste, os melhores resultados foram obtidos com as amostras boretadas a 1000°C. Quanto à oxidação, os dois aços boretados a 900°C por 2h apresentaram os melhores desempenhos, e quanto à corrosão, os parâmetros do tratamento de boretação não influenciaram significativamente os desempenhos.
Title in English
Influence of pack boriding on the wear, corrosion and oxidation resistance of AISI 1060 and AISI H13 steels
Keywords in English
AISI 1060
AISI H13
corrosion and oxidation
pack boriding
wear
Abstract in English
In this work the effect of pack boriding on wear, corrosion and oxidation resistance of AISI 1060 and AISI H13 steels were studied. Samples of the steels were pack borided at 900 and 1000°C for periods of 2 and 4h. Fixed-ball microwear tests were performed on borided and non-borided samples, without use of abrasives. The samples corrosion resistances, in HCl 0.1M, were evaluated by potentiodynamic polarization tests. Quasiisothermal oxidation tests were performed at 550°C on air. High hard layers were formed on steels for all treatment conditions employed. The layers properties, such as hardness, thickness, layer/substrate interface morphology and phases formed, were influenced by steels compositions. For AISI H13 steel, which has a larger amount of lloying elements, the formed layers were arder, thinner, with smooth interface and for all treatments conditions the compounds Fe2B, FeB and CrB were formed. For borided AISI 1060 steel, the layer/substrate interfaces showed a saw-tooth morphology and for boriding temperature of 900°C only the Fe2B phase were formed, appearing FeB for boriding temperature of 1000°C. The wear, corrosion and oxidation resistances of borided steels significantly increased and in relation to wear, the best results were btained with the samples borided at 1000°C. In oxidation case, both steels borided at 900°C for 2h showed the best performances, and with respect to corrosion, boriding treatments parameters did not significantly affect the performances.
 
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Publishing Date
2011-01-07
 
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