Add time:08/01/2019         Source:sciencedirect.com

Boriding has attracted great interests in improving mechanical performance of materials. The high processing temperature and the relatively thin boride layer, however, have limited its applications. Here we report a method to boronize high-carbon steels at a relatively low temperature (780 °C). Using the arc melting process, a thick (> 400 μm) boronized coating is obtained. Two iron-boride phases (FeB and Fe2B) coexist in the borided layer. The surface hardness of the steel is increased by ~ 57%, while the friction is reduced by ~ 17% and ~ 65% under steel-steel and steel-diamond contacts, respectively. In a 40,000 cycle wear test, the wear track on the steel surface becomes invisible after the boriding treatment. The low-temperature process developed in this study is applicable to other materials and is effective in making thick boride coatings with less energy consumption.

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