Effect of Y on the Structure and Erosion Wear of Laser-Cladding FeCoCrNi Coating on Bearing Steel

The FeCoCrNi-xY high-entropy alloy coating was prepared on bearing steel by laser cladding method,and its high-temperature erosion resistance in a gas environment was tested. The effect of Y on coating structure and erosion wear was studied. The results show that with the increase of Y,the honeycomb structure begins to decrease until it disappears completely,and many small-size M particles are generated,forming a Y-compound structure with smaller particle size and more uniform distribution. After increasing the amount of Y,the hardness of the coating first decreases and then increases,and the hardness measured is in the range of 720-960 HV. When the erosion angle is gradually increased,the erosion wear rate of the FeCoCrNi-xY coating continues to increase. The FeCoCrNi-xY coating obtains a higher hardness than the bearing steel,showing obvious brittleness. The erosion of the FeCoCrNi-0.3Y coating forms deeper furrows and achieves a higher erosion wear rate. When the temperature increases,the wear rate also increases,but the change range is lower. The wear pattern of coating at various angles of attack was not affected by temperature.