The effect of B4C particle contents on hardness and wear resistance of Al-SiC-B4C composite formatted on AA332 via GTAW process

Document Type : Research Paper

Authors

• M Amini ¹
• H Sabet ²
• B Karbakhsh ravari ³

¹ ms student of department of materials engineering of karaj branch islamic azad university

² department of materials engineering of karaj branch islamic azad university

³ Assistant Professor of materials engineering of karaj branch islamic azad university

Abstract

One of the mechanisms of degradation of the wear parts is considered. In this study, Al-SiC-B₄C composite with B₄C various rate prepared on surface of AA332 alloy. For make surface composite, all the samples were surface melted. Microstructural investigation with optical and electron microscope shows, SiC and B₄C placed in proximity to the grain boundaries. Increasing of B₄C content is cause of increase tendency formation of Al₃B₄C and Al₄C₃ phases. Hardness of composite layer increase up to 182 HV has more than doubling the number. Unlike the hardness, wear resistance with increasing B₄C showed different behavior. The results of Pin on disk wear test showed that B₄C in each case leads to a decrease in the rate of wear. But after 1000 meters, the wear rate increased with increasing B₄C. Check of the worn surfaces by SEM showed that the wear mechanism from adhesion to abrasive with increasing B₄C changes.

Keywords

• wear resistance
• surface composite
• GTAW
• B4C

20.1001.1.22285946.1397.8.31.10.7

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