Application of heat treatment technology in the production of mechanical blades Ⅰ
1.Non-oxidizing protective atmosphere heating technology
When steel parts are heated in air, they will produce defects such as oxidation and decarburization. In order to prevent this drawback, a neutral atmosphere such as nitrogen is filled into the heating furnace to protect the workpiece for heating. This technology is called protective atmosphere heat treatment. Molecular nitrogen is neutral to general metals and steel during the normal heating process, and neither oxidizes, decarburizes, nor reduces oxides. Using nitrogen-based protective atmosphere to save energy and protect the environment is also the direction of heat treatment development.
2.Brazing-quenching composite heat treatment technology
Compound heat treatment is to combine two or more heat treatment processes, or to combine heat treatment processes with other processes to further tap the potential of materials and enable the workpiece to obtain excellent performance that cannot be achieved by a single process method. With the development of the national economy and science and technology, a single heat treatment technology often cannot meet the high requirements for material use, which has led to the development and application of composite heat treatment technology.
3.Rapid heating technology
In the tool heat treatment process, there are two most important process parameters, namely heating temperature and heating time. From the perspective of increasing the amount of carbide dissolved and improving the austenite alloy degree, the higher the austenitization temperature, the better, in order to increase the wear resistance and hot hardness of the tool, but from the perspective of refining the grains and improving toughness, the quenching temperature should not be too high. According to the characteristics of mechanical blades, a lower quenching heating temperature and a longer insulation time should be adopted, but this will waste a lot of energy. Through repeated practice, we have explored the rapid heating process, that is, using a higher temperature and a shorter time to make the blade hard and tough. As can be seen from the above formula, increasing the temperature is more effective than extending the time. As long as the parameters of the two are the same, the effect of heat treatment should be consistent. In production, we have realized that rapid heating must grasp the concept of "degree", otherwise it will backfire.
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