Wear and Corrosion Resistance of Hardened Fe-Al-Mn Grinding Ball
release_wie3wk6ubvdixbr3rcx3jfvs6m
by
Ratna Kartikasari,
Adi Subardi,
Anita Susiana
2020 Volume 14, p15-23
Abstract
<jats:sec>
<jats:title>Objective:</jats:title>
This study aimed to determine the effect of hardening temperature on microstructure, wear and corrosion resistance of Fe-Al-Mn alloy grinding ball.
</jats:sec>
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<jats:title>Methods:</jats:title>
Hardening process was carried out at 900<jats:sup>o</jats:sup>C, 950<jats:sup>o</jats:sup>C, 1000<jats:sup>o</jats:sup>C, 1050<jats:sup>o</jats:sup>C and 1100<jats:sup>o</jats:sup>C, held for 60 minutes and cooled using SAE 20 oil. Tests included chemical composition, SEM-EDS, wear and corrosion resistance test.
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<jats:title>Results:</jats:title>
Chemical composition test results show that this alloy is high alloy steel because it contains 3.6% aluminum (Al), 13.6% manganese (Mn) and 1.1% carbon (C). Microstructures found are austenite, ferrite and kappa. EDS test results show that in the austenite phase, C decreased when hardening temperature increased. Ferrite phase contains Mn which increased when hardening temperature increased while C was the other way around. Mn is relatively stable in the kappa phase. The best wear and corrosion resistance (4.3 x 10<jats:sup>-7</jats:sup> mm<jats:sup>2</jats:sup>/kg and 0.00026 mm/yr) of hardened Fe-Al-Mn grinding ball occurred at 900<jats:sup>o</jats:sup>C. The corrosion rate is extraordinary.
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<jats:title>Conclusion:</jats:title>
Microstructures of the Fe-Al-Mn alloy grinding ball after the hardening process are austenite, ferrite and kappa.
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