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, […]
2.4 Low-magnification analysis In order to further analyze the material quality of the dia90 mm low chromium cast grinding ball, the sample was taken at the fracture position parallel to and close to fracturing by electric spark cutting method. The sample was polished by grinding wheel and heated to about 70 °C in 50% hydrochloric […]
2.3 Metallographic test With the hardness mentioned above test samples, the metallographic samples were prepared near the fracture point, polished and polished without erosion at 100-fold optical. Non-metallic inclusions were detected under the microscope. The results are shown in Table 2 and Figure 2.
LU Weidong , SHEN Maolin , ZHOU Yuanxing (Institute of Ningguo Wear Resistant Materials General Plant Anhui Province, Ningguo 242300 , China) Abstract: The cracking of the 90mm low chromium casting ball occurred too early in the drop ball test. The casting ball material was analyzed by chemical composition, mechanical properties, and metallographic structure. The […]
The as-cast and austenitic matrix structure can be obtained through the reasonable design of the chemical composition, strict control of each element’s content, and rapid cooling process. The volume content of AUSTENITE is 55% ~ 70%, the amount of carbide is 20% ~ 26%.
Abstract: The production process and main points of high austenitic chromium cast iron grinding ball are introduced. Because of its as-cast austenite structure, it has a high impact toughness. Besides, under impact friction, the microstructure will change to Martensite Matrix, resulting in hardening, which makes the material have high impact wear resistance and high toughness. Production […]
(4) Properties of cr25 high chromium cast iron ball grinding products Metallographic structure: The metallographic structure of CR25 high chromium cast iron grinding ball is tempering, eutectic carbide (Ke) and primary carbon, carbide (K1) are homogeneously embedded in the matrix of fire Martensitic (m), and the particles, grains, second and Secondary Carbides (K2) are uniformly […]