Quality Inspection of Heat Treatment for Crusher Jaw Plates
For the heat treatment quality inspection of crusher jaw plates made of high manganese steel, it should include inspections of hardness, cracks, carbide precipitation, decarburization, etc., and must be carried out in strict accordance with technical requirements. For defects such as unqualified hardness or carbide precipitation, solution annealing and water quenching must be re-conducted, and attention should be paid to ensuring that the temperature when entering water complies with regulations.
It should be noted here that decarburization of castings is harmful: after cooling in water, the decarburized layer transforms into a martensite structure, but the surface layer is very brittle with extremely low plasticity, and its bonding force with the internal austenite structure is very poor. Under impact abrasive wear conditions, the surface layer peels off quickly. After water cooling, the decarburized layer undergoes martensitic transformation, resulting in volume expansion, while the inner layer of the metal remains an austenite structure. Stress occurs between the surface layer and the inner layer, and the linear shrinkage rates of the two structures are also different during subsequent cooling, leading to surface cracking.
Post time: Oct-29-2025