A high-fe aluminum matrix welding filler metal for hardfacing aluminum-silicon alloys

Abstract

A high-Fe containing aluminum matrix filler metal for hardfacing aluminum-silicon alloys has been developed by using iron, nickel, and silicon as the major strengthening elements, and by measuring mechanical properties, room temperature and high temperature wear tests, and microstructural analysis. The filler metal, which contains 3.0%–5.0% Fe and 11.0%–13.0% Si, exhibits an excellent weldobility. The as-cast and as-welded microstructures for the filler metal are of uniformly distribution and its dispersed network of hard phase is enriched with Al-Si-Fe-Ni. The filler metal shows high mechanical properties and wear resistance at both room temperature and high temperatures. The deposited metal has a better resistance to impact wear at 220°C than that of substrate Al-Si-Mg-Cu piston alloy; at room temperature, the deposited metal has an equivalent resistance to slide wear with lubrication as that of a hyper-eutectic aluminum-silicon alloy with 27% Si and 1% Ni.

Keywords

aluminum-silicon alloys / high-Fe aluminum matrix filler metal / hardface

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