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Master's Dissertation
Full name
Alessandro Fraga Farah
Knowledge Area
Date of Defense
São Carlos, 1997
Canale, Lauralice de Campos Franceschini (President)
Bose Filho, Waldek Wladimir
Zavaglia, Cecília Amélia de Carvalho
Title in Portuguese
Desenvolvimento de uma liga de ferro fundido branco alto cromo com nióbio, tratada termicamente, para resistência ao desgaste abrasivo
Keywords in Portuguese
Desgaste abrasivo
Ferro fundido branco
Revestimento duro
Tratamento térmico
Abstract in Portuguese
No presente trabalho são relatados os resultados obtidos através de tratamentos térmicos e de ensaios de abrasão, em uma liga de ferro fundido branco alto cromo contendo nióbio, obtida por fundição. Os tratamentos térmicos de têmpera foram efetuados nas temperaturas de 950, 1000, 1050 e 1100ºC e o meio de resfriamento utilizado foi o ar soprado. Os tratamentos de revenidos foram efetuados nas temperaturas de 450, 500 e 550ºC. A liga no estado termicamente tratado foi comparada, nos ensaios de abrasão, com ligas comerciais utilizadas como revestimento duro por soldagem em peças desgastadas. Os ensaios de abrasão do tipo pino sobre lixa. Adicionalmente, também foram efetuados estudos de caracterização microestrutural para a identificação das diferentes fases presentes nas ligas. De maneira geral, a liga estudada apresentou as melhores taxas de desgaste para os tratamentos térmicos que resultaram em maiores durezas e o seu desempenho foi superior ao das ligas comerciais.
Title in English
Development of the white cast iron with niobium alloy, heat treating, to wear of the abrasive resistance
Keywords in English
Abrasive wear
Heat treatment
White cast iron
Abstract in English
This work presents the heat treatments and abrasion tests results of a wnite cast iron with niobium alloy. The hardening heat treatment were made from 950, 1000, 1050 and 1100°C temperatures cooled by forced air. The tempering treatment were made at 450, 500 and 550°C temperatures. The heat treating alloy were compared, in the abrasive tests, with commercial alloys used as hardfacing by welding process in wear pieces. The abrasion tests was realized in pin on disk test. Additional tests were carried out for microstructural characterization to identify the differents phases presents in the alloys. In a general way, the alloy studied showed the best wear rate for the heat treatments that resulted in higher hardness. Its performance was superior than that of the commercial alloys.
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