ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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Resumo
The effects of cooling rates of 10 and 550 °C/min were investigated in a 7% chromium and 0.6% Si alloy family with carbon contents between 2.2 and 4.1%. The studies were performed in shell moulded samples (550 °C/min) and differential thermo analysis samples (10 °C/min) using both light and electron microscopy. At 550 °C/min it was observed that the %C₃ carbides were totally replaced by M₃C as the carbon content exceeded 2.4%. Reducing the cooling rate to 10 °C/min resulted in M₃C₃ carbides replacement by M₃C only at 4.1% carbon. It was observed that when both %C₃–M₃C carbides are formed, some of M₃C inherit the primary or eutectic M₃C₃ morphology. It is proposed that a schema using the temperature interval between the γ + M₃C₃ eutectic temperature and the quasi-peritectic L + M₃C₃ = γ + M₃C temperatures can be used to rationalise the effect of cooling rate on the carbide nature.
Palavras-chave
chromium cast iron, cooling rate, carbides, solidification, microstructure
Como citar
Sinatora, A.; Pohl, M..
COOLING RATE AND CARBIDE NATURE ON CHROMIUM CAST IRON,
p. 215-230.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v1-215-230
