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钢表面抛(喷)丸除锈,其效果与钢丸的磨损失效有关,过去对其重视不够。为此,采用欧文寿命试验机模拟实际抛(喷)丸清理过程,采用100%替代法测定二次淬火+回火后的高碳铸钢丸的欧文寿命,以500次循环为1个周期,测量每周期的质量损耗量及磨损形貌,计算比例,直至累计循环达到欧文循环寿命的次数。用扫描电镜观察分析钢丸磨损失效的形式,用质量比表征磨损形式比例,并分析磨损失效过程。结果表明:钢丸的磨损失效属于冲击磨损,磨损失效形式主要包括表层剥落和心部脱落,循环500次内以表层剥落为主,1000次以上心部脱落逐渐加强,直至约3000次时全部破碎;钢丸的磨损失效过程为低周次时破碎率较低,出现表层剥落,高周次时破碎率较高,出现心部脱落,进而引起粒度的降低和损耗量的增加。
Steel surface thrown (spray) pill derusting, the effect and wear and tear of steel balls related to the past, their attention is not enough. For this purpose, the Irving life test machine is used to simulate the actual polishing process, and the 100% substitution method is used to determine the Irvine lifetime of the second quenched and tempered high-carbon steel shots. One cycle of 500 cycles is used, Measure the mass loss and wear profile per cycle, and calculate the ratio until the cumulative number of cycles of Irvine cycle life is reached. Scanning electron microscopy (SEM) was used to analyze the failure modes of shots. The proportion of wear forms was characterized by mass ratio and the wear failure process was analyzed. The results show that the wear failure of steel shot belongs to the impact wear. The wear failure forms mainly include surface spalling and heart detachment. The surface spalling is the main part within 500 cycles, and the heart part detachment is strengthened more than 1000 times. ; When the wear failure process of steel balls is low cycle, the broken rate is lower, the surface layer is peeled off, the breaking rate is higher at high cycle, and the heart part falls off, which leads to the decrease of particle size and the increase of the loss.