What are the three elements of metal heat treatment machinery to help you understand the relevant knowledge
Regarding metal heat treatment, many people have little or no knowledge about metal heat treatment. This is to follow Kehua to look down. Heat treatment training finishing and release: There are three basic elements in the heat treatment process: heating, heat preservation, and cooling. These three basic elements determine the structure and properties of the material after heat treatment. Heating is the first process of heat treatment. Different materials have different heating processes and heating temperatures. There are two types of heating. One is heating below the critical point A1, where no tissue change occurs. The other is heating above A1 in order to obtain a uniform austenite structure, a process called austenitization. The purpose of heat preservation is to ensure that the workpiece is burned through and prevent decarburization and oxidation. The selection of holding time and medium is directly related to the size and material of the workpiece. Generally, the larger the workpiece, the worse the thermal conductivity and the longer the holding time. Cooling is the final process of heat treatment and the most important process of heat treatment. Steel can be transformed into different structures at different cooling rates. According to the different heating and cooling methods and the different characteristics of structure and performance, heat treatment can be divided into the following categories: 1. Ordinary heat treatment includes annealing, normalizing, quenching and tempering, etc. 2. Surface heat treatment includes induction heating surface quenching, flame heating surface quenching, electrical contact heating surface quenching, carburizing, nitriding and carbonitriding, etc. 3. Other heat treatments include controlled atmosphere heat treatment, vacuum heat treatment and deformation heat treatment. According to the different positions and functions of heat treatment in the production process of parts, the heat treatment process can also be divided into preliminary heat treatment and final heat treatment. Preparatory heat treatment is an intermediate process (also known as intermediate heat treatment) in the processing of parts. Its purpose is to improve the structure of forging and casting blanks, eliminate stress, and prepare for subsequent machining or further heat treatment. Final heat treatment is the final process of part processing, and its purpose is to make the performance of the part after the forming process reaches the required shape and size to achieve the required performance. What are the types of metal heat treatment machinery, and this type of problem, today, have netizens read the knowledge? Watch the relevant content, understand the relevant knowledge of metal heat treatment machinery, and further enrich your knowledge.