采用经过1150℃淬火，550℃回火三次的K390、S590锻造坯，尺寸为30*30*5mm，对其表面进行喷丸强化处理，喷丸参数为0.25A、200%，同时与未经喷丸的试样进行对比，每50μm的层深进行一次显微硬度测试，选择1kg的载荷，保载时间15 s，同一层深测5次，取平均值。并进行摩擦磨损实验切20*10*5mm的摩擦磨损试样，实验载荷为35N，摩擦副采用SiC球，频率5Hz，摩擦距离不小于360m，最小摩擦行程10mm，磨损时间为60min。随后使用电子扫描显微镜观察其磨损形貌。

The K390 and S590 forging blanks, which have been quenched at 1150 ℃ and tempered at 550 ℃ for three times, with the size of 30 * 30 * 5mm, are used for shot peening strengthening treatment on their surface. The shot peening parameters are 0.25A and 200%. At the same time, compared with the samples without shot peening, every 50 μ Carry out a microhardness test at the depth of m, select a load of 1kg, hold the load for 15s, and measure the same depth for 5 times, taking the average value. The friction and wear test shall be carried out and 20 * 10 * 5mm friction and wear samples shall be cut. The test load is 35N. The friction pair shall be SiC ball with a frequency of 5Hz, the friction distance shall not be less than 360m, the minimum friction stroke shall be 10mm, and the wear time shall be 60min. Then the wear morphology was observed by scanning electron microscope.