Dry sliding wear behavior of borided hot-work tool steel at elevated temperatures

摘要

AbstractIn the present study, the surface of AISI H13 hot-work tool steel was borided with EKabor II powders using powder pack-boriding method. The process was carried out at 800, 900 and 1000°C temperatures for 2, 4 and 6h periods. The wear tests were carried out using a ball-on disc tribometer at room temperature and 500°C on borided and untreated AISI H13 hot-work tool steel. Scanning electron microscope (SEM), optical microscope, 3D profilometer, X-ray diffraction analysis and micro-hardness tester were used in the evaluation of micro-structure and wear data. The increase in the boriding temperature and boriding period led to increased thickness and hardness of the boride layer. Boriding at 800°C resulted with formation of Fe2B, Mn2B, Cr5B3,phases, while FeB, Fe2B, Mn2B, and Cr5B3boride phases occurred at 900 and 1000°C. Dominant wear mechanisms were microcrack-induced plastic deformation during high temperature wear tests; oxidation and microcrack formation during room temperature wear tests; and oxidation and severe plastic deformation for the untreated specimen.Highlights?Boriding process was performed on AISI H13 steel by powder pack boriding.?Friction coefficients and wear mechanisms at room and 500°C were investigated.?Boriding was effective on the change of wear mechanism of the AISI H13.?Friction coefficient and volume loss values were higher at high temperature.?Wear mechanisms occurred depending on hardness and phase structures of AISI H13.]]>