Failure analysis of ZGMn13 liner of ball mill

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 Through the macro inspection and the onlooker inspection, it can be found that the liner of the ball mill will occasionally show loose casting, oxides, and a large number of massive unmelted carbides and needle-like carbides.

    The ideal microstructure of high manganese molten steel after treatment is a single austenite, but due to the metallographic examination of the liner, there are a large number of unmelted massive carbides and precipitated needle-like carbides in the microstructure. This is because the heating temperature is too low during the water toughening treatment, or the holding time is too short, so that the carbides are not fully integrated into the austenite. In the subsequent quenching and cooling process, a large amount of precipitation may be due to insufficient cooling speed. Needle carbide. From the field investigation, the heating temperature of the heat treatment furnace will be lower than the temperature required by the process due to long-term neglect and maintenance; when the water toughening treatment is cooled, because the water tank is too small, the treated tonnage is too heavy. The water temperature after cooling cannot be kept below 60 degrees Celsius, which reduces the cooling rate; if the workpiece stays in the water for too long from the furnace to the water, these will make the microstructure after the water toughening treatment appear abnormal.

    The chipping of the liner of the ball mill is mainly due to the improper longevity of the heat treatment process, the defective structure and casting shrinkage, as well as the existence of coarse non-metallic debris, which reduces the strength and toughness of the liner. Under the action of this, it will lead to the early failure of the liner.

Specific details can be consulted：https://clactononseaessex.uk/

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