Through the reasonable design of the chemical composition, strict control of the content of each element, through metal mold casting process and rapid cooling scheme, as-cast austenite, matrix structure, austenite occupied, volume content 55% ~ 70%, carbide content 20% ~ 26% can be obtained.
Abstract: The production process and key points of austenitic high chromium cast iron grinding ball are introduced. Because of its as-cast austenite structure, it has high impact toughness. In addition, in the condition of impact friction, the microstructure will change to martensite, which will produce a work-hardening phenomenon. The material has high toughness and high […]
2.2 Analysis of Gouge test results Each group of chromium grinding media balls into the cone-shaped cylinder body, artificial hammer gouge, and gouge results are shown in Table 2. According to the gouging results, the most frequent place of debris produced by grinding ball is at the boundary of metal mould, and the test results […]
Abstract: Through the falling test and chiseling-hammering test conducted with the metal-sand composite mould cast low chromium grinding balls, it was concluded that the peeling phenomenon had occurred with many balls before their early failure. The cracking initiated at the area of interface between the metal mould and sand mould, then the debris peeling occurred, […]
2.1 Heat-treated structure Fig. 3 is a metallographic picture of each alloy steel (1.1% C) as-cast and corroded by 4% nitric alcohol after being annealed at 1000 °C, quenched at 980 °C, and tempered at 220 °C. As-cast, it has a large dendrite and a large amount of Carbide. XRD analysis (Fig. 4) shows that […]