通过对低铬磨球进行落球试验和凿击试验,得出:采用金属型-砂型复合铸型铸造的低格磨球早期失效成梨形前,大量磨球存在剥落现象;裂纹首先产生于金属型砂型交界部位,而后产生碎片剥落,且碎片是从金属型砂型交界部位剥离;对剥落碎片的断口形貌分析,可判断金属型砂型处磨球碎片的断裂方式为解理穿晶脆性断裂。 Through the ball dropping test and the chisel test on the low chromium grinding ball, it is concluded that a large number of grinding balls are exfoliated before the low-wear grinding balls cast by the metal type-sand composite casting mold become pears, and the cracks first originate from the metal Sand mold boundary, and then the debris spalling occurs, and the fragments are peeled off from the interface of the metal sand mold. The fracture surface morphology of the spalling debris can be judged as the cleavage of translucent crystal brittle fracture of the abrasive particle of the metal sand.