The Influence of Boron Additions on Microstructure and Dry Sliding Wear of Cast FeAl-Based Alloys

In this research, the influence of boron content on microstructure and dry sliding wear resistance of as-cast FeAl-based alloys was evaluated. The alloying process was carried out using vacuum induction melting and four specimens having different boron content of ۰, ۰.۱, ۰.۵ and ۱ at% were produced. As-cast specimens then were teste using standard pin-on-disk wear tester machine in ۲۰ and ۴۰ N applied load and a distance of ۱۰۰۰ m according to ASTM G۹۹ standard. The surface of worn specimens then were examined using scanning electron microscope to determine the dominated wear mechanism. The investigations revealed that at lower applied load of ۲۰ N, the governing wear mechanism is oxidative wear and for higher applied load of ۴۰ N, delamination is the governing mechanism. Increasing the boron content increases the hardness as well as the wear resistance of the alloy which is related to the formation of Fe۲B compounds in the material and increasing the hardness.

Keywords:

Iron Aluminide- FeAl , Boron Content , Casting , Microstructure , Wear Properties