What Are The Technical Types Of Metal Heat Treatment?

The heat treatment process of metal materials has been successfully used in social life and war in hundreds of BC. However, the principle of metal heat treatment began in the last century, and has lagged behind the craftsmanship for thousands of years. From a wide range of modern industrial fields, the principle of metal heat treatment is now called metal solid state phase transition. So, what are the types of metal heat treatment technologies?

1. Pearlite transformation technology

Pearlite technology is an important metal heat treatment technology. There are many defects in the mechanism of pearlite transformation. The pearlite structure is a phase transition that was discovered earlier and has been studied more. The decomposition reaction is a process in which one phase changes into two phases, and the reaction products are simultaneously generated according to the reaction formula. The formation of ferrite and cementite by eutectoid decomposition reaction of supercooled austenite is no exception. Pearlite transformation technology is a type of high-efficiency metal heat treatment technology, which is more and more widely used.

2. Martensitic transformation technology

Martensitic technology is also an important type of technology. Martensitic structure has long been observed, mainly low magnification metallographic structure. The "shear" mechanism of martensitic transformation was proposed at the beginning of the last century and was limited to lattice shear in pure metals. It was not until the late last century that a variety of models were proposed, all of which were inconsistent with reality. It seems that the default shear mechanism is well established "theory". Martensite is therefore also an efficient metal heat treatment technology.

3. Bainite transformation technology

Its substructure was observed and studied in detail only after the application of electron microscopy in the late last century. At that time, the discussion of the bainite transformation mechanism in textbooks or books was limited to the "shear" mechanism. Bainitic rails have good strength and toughness, wear resistance and contact fatigue resistance. Effective control of the stability and content of retained austenite is the key to obtaining bainitic rails with stable comprehensive properties, which has also become an important metal heat treatment. Technology type.

All in all, metal energy occupies an important position in the development of human beings and is an important energy source, and the development and progress of society cannot be separated from the use of metal energy. Metal heat treatment technology makes metal more useful for people, and its value is excavated to a large extent. It is believed that the application of metal heat treatment in thermal power engineering will provide a broader development space in the future.