Investigation on Graphite Passivation Production Technology of Gray Cast Iron Brake Drum
Aiming at the problem that the brake drum cracking failure is easily caused by frequent cold and hot cycles during repeated braking of commercial vehicles,a method of passivating the-flake graphite end by using of rare earth element,nitrogen element and passivation process is proposed.Under the condition of high carbon equivalent composition(CE≥3.9％),the graphite passivation material and production process of the gray cast iron brake drum were investigated to improve the conventional mechanical properties and thermal fatigue resistance properties of the brake drum,and provided technical support for the production of heat-resistant and hermal fatigue resistance brake drum castings for commercial vehicles.
gray cast ironbrake drumthermal fatigue resistance propertygraphite end passivationmetallographic structure
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