Abstract
Pack aluminizing of spheroidal graphite cast iron with different aluminizing temperature and time was studied. Results showed that the thickness of aluminized layer increased with the increasing temperature and time. The optimized process parameters are as follow: the aluminizing packed temperature is 830 °C and the time is 3 h. The aluminized layer consisted of the inner FeAl and the outer Fe2Al5. Some graphite nodules were observed in the aluminide layer after aluminizing. The mass gain of the aluminized cast iron was 0.405 mg/cm2, being 1/12 of the untreated substrate after oxidation. The high temperature oxidation resistance can be improved effectively by pack aluminizing, even though there were graphite nodules in the aluminide layer.
Highlights
Spheroidal graphite cast irons have good thermal conductivity, excellent fatigue resistance and high strength
This paper reported the effects of aluminizing temperature and time on the microstructure and thickness of aluminide layer during pack aluminizing on spheroidal graphite cast irons
The growth direction of the pack aluminide layers formed inside the matrix is confirmed
Summary
Spheroidal graphite cast irons have good thermal conductivity, excellent fatigue resistance and high strength. Previous researches have shown that FeAl intermetallic phases such as Fe2 Al5 , FeAl3, and FeAl could effectively increase the high-temperature oxidation resistance [4,5,6] This is because intermetallic phases such as Fe2 Al5 , FeAl3, and FeAl can protect the metal surface by continuously forming Al2 O3 film. Studies have shown that pack aluminizing could be successfully applied to carbon steel, stainless steel and alloys at low temperature It was under the help of other surface process, such as magnetron sputtering, deep rolling process and plasma nitriding [13,15,16,17]. This paper reported the effects of aluminizing temperature and time on the microstructure and thickness of aluminide layer during pack aluminizing on spheroidal graphite cast irons.
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