15-5PH+QT stainless steel is a high-performance stainless steel material with excellent corrosion resistance, strength and wear resistance, which is widely used in petroleum, chemical, aviation, marine engineering and other fields. In order to ensure its excellent mechanical properties and service life, the heat treatment process is crucial.
The heat treatment process of 15-5PH+QT stainless steel mainly includes three steps: solution treatment, aging treatment and quenching and tempering. First of all, solution treatment is to heat the steel to a certain temperature, so that the alloying elements are fully dissolved in the matrix to form a uniform solid solution. This step relieves the internal stresses of the material and improves the plasticity and toughness of the material.
This is followed by aging treatment, in which the solution-treated material is kept warm at a certain temperature for a period of time, so that the alloying elements are redistributed in the matrix to form fine precipitates. These extractables can significantly increase the strength and hardness of the material while maintaining good plasticity and toughness.
Finally, there is quenching and tempering treatment, that is, the material is heated to a high temperature and cooled quickly to form a martensite structure inside the material, and then tempered to transform the martensite structure into tempered martensite or tempered sostenite. This step further increases the hardness and wear resistance of the material while reducing brittleness and internal stresses.
Temperature control is crucial throughout the heat treatment process. Temperatures that are too high or too low can lead to a decrease in material properties. Therefore, advanced temperature control technology and equipment are required to ensure the accuracy and stability of the heat treatment process.
In conclusion, the heat treatment process of 15-5PH+QT stainless steel is a complex and delicate process, which requires strict control of the parameters and operations of each step to ensure the quality and performance of the final product.