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What To Do If You Encounter Vacuum Sudden Fire Distortion During Heat Treatment

In recent years, as the heat treatment technology of auto parts becomes more and more mature, the geometric accuracy of the workpiece after heat treatment is required to be higher and higher. Quenching deformation will inevitably cause a decrease in the geometric accuracy of the workpiece. The quenching of the workpiece needs to be heated to 850~950℃, and high temperature will often produce adverse effects, such as distortion. Molded vacuum quenching is also called pressure quenching. It is an effective means to reduce quenching deformation and is widely used in the automotive industry.

Vacuum quenching distortion is the most common problem in the heat treatment process. For mass-produced bearings and gears, controlling quenching distortion is an effective means to improve the internal quality and service life of the product. For the material of carburized steel (such as carburized bearing steel G20CrNi2MoA) or low-alloy steel for gears (18CrMnTi, etc.), the finished product requires a certain carburized layer thickness to meet the requirements of high surface hardness and good toughness at the core. The use of die-pressing quenching technology is a direct and effective measure to prevent quenching distortion and improve the qualification rate.

Aiming at the distortion problem encountered in the vacuum quenching process, there is a compression quenching technology and equipment that can effectively control distortion. The structure and size of the quenching mold can be adjusted by controlling the magnitude, period and method of the force, and the flow of the coolant can be controlled. Flow state and flow direction, etc., control the distortion process, reduce the distortion of the workpiece, combine the mold and the machine tool under the premise of meeting the quenching requirements, and provide the molding quenching process equipment to realize the quenching process, and ensure the hardness and metallographic requirements. At the same time, it maintains the consistency of the quenched workpieces, controls the quenching quality at the best level, and puts it into industrial application, which comprehensively reduces the quenching distortion.

During the implementation of compression molding vacuum quenching technology, 0Cr17Ni4Cu4Nb steel was subjected to two different nitriding process tests in two states of solid solution and solid solution + aging. The process temperature, ammonia decomposition rate, original structure of the material infiltration layer depth, The influence of organization and performance after nitriding. The results show: whether it is effective after solid solution, the nitriding layer depth, surface hardness and core hardness of 0Cr17Ni4Cu4Nb steel after nitriding are basically the same, and direct nitriding after solid solution can be considered; the performance after nitriding at 540℃ is better Performance after nitriding at 480°C.