EFFECT OF COOLING RATE ON MICROSTRUCTURE AND HARDNESS IN GRAY CAST IRON CASTING PROCESS

Authors

DOI:

https://doi.org/10.36547/ams.27.3.996

Keywords:

cooling rate, graphite, gray cast iron, hardness

Abstract

This study aims to investigate the thermal conditions of the molds, changes in microstructure and hardness of casting products using sand mold and permanent mold. The use of sand mold and permanent mold results in different cooling rates. Thermal analysis was performed using a thermocouple to obtain a temperature versus time curve. Metallographic observations were carried out using a Scanning Electron Microscope equipped with Energy-Dispersive X-ray Spectroscopy. The Vickers hardness test was carried out in three areas with different thicknesses. The results showed a constant temperature at 691 oC where the eutectoid phase reaction occurred. Testing with sand mold showed that cast iron with flake graphite was finer and spreader than graphite in cast iron produced by permanent mold. Meanwhile, gray cast iron from a casting process with a permanent mold has a higher hardness than gray cast iron from a casting process using a sand mold.

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Published

2021-09-13

How to Cite

Yulianto, A., Soenoko, R. ., Suprapto, W. ., & Sonief, A. . (2021). EFFECT OF COOLING RATE ON MICROSTRUCTURE AND HARDNESS IN GRAY CAST IRON CASTING PROCESS. Acta Metallurgica Slovaca, 27(3), 127-132. https://doi.org/10.36547/ams.27.3.996
Received 2021-05-31
Accepted 2021-08-24
Published 2021-09-13