Abstract
High chromium cast irons (HCCIs) are the typical commercial hardfacing alloys and many studies try to improve their properties. Based on the concepts of high entropy alloys, multi-element hardfacing alloys were developed. Pin-on-belt testing was used to evaluate the abrasion-resistant ability of these alloys. The most abrasion-resistant alloy was the THA alloy (Al1.3Cr18.4Fe38.7Mn4.4Ni2.2Mo0.4Nb4.4B28.0C2.2) and its abrasion-resistance was about 12 times of the traditional HCCIs. However, this abrasion testing results cannot imply to real cement industries. In order to reflect industrial application more truly, a new impact-wear test machine was designed. The sample which is stick to one punch moves vertically to crush quartz particles. The results show this impact-wear test can truly reflect wear-resistant properties in industrial application. Three alloy systems of HFe-HC series, UP series and THA series were used to study their impact-wear abilities. In HFe-HC series, the HFe-HC 3 alloy has the best anti-impact wear properties because of its highest toughness. However, the hardness of HFe-HC 3 is so low that its weight loss rate is still high. In UP series prepared by vacuum arc melting, the 266 alloy (Fe51.1Cr25.1Mn0.6Ni0.1Si1.3B0.4C21.4) was the best anti-impact- wear alloy. The composition of the 266 alloy was modified to improving its anti-impact-wear property via changing Fe and B content, adding precipitation hardening elements, or modifying matrix elements. We found two modified 266 alloys have the same anti-impact-wear properties (weight loss rate is 2.6 mg/h) as that of the 266 alloy. The hardness, toughness, and microstructure of alloys can intricately affect their impact-wear properties. In THA series, hardness and toughness can be improved by adding 0.25 at% tungsten into the THA alloy. The THA-0.25W alloy has the best anti-impact-wear properties and its weight loss rate is 2.2 mg/h.