Abstract
Powder-pack boriding process was conducted on AISI D2 tool steel to improve its solid particle erosion resistance when compared to hardened and tempered (H&T) AISI D2 steel. FeB and Fe2B layers with thicknesses of 49 ± 6 μm and 44 ± 7 μm, respectively, were obtained. Erosion resistance was evaluated at different impingement angles at room temperature (RT) and 400 ºC using alumina particles. Novel results show that borided AISI D2 steel performs significantly better than H&T AISI D2 steel at impingement angles of 15º, 30º and 60º at both RT and 400 ºC, with reductions up to 81% in mass loss. However, at 90º, mass loss for borided AISI D2 steel is significantly higher. Mass loss in H&T AISI D2 steel is generated by progressive cutting and microforging, whereas in the borided AISI D2 steel it is generated by cracking and fracture.
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