Want to know what quenching is, here is all about it
Quenching is to heat the steel above the critical temperature, keep it for a certain period of time, and then cool it at a rate greater than the critical cooling rate, so as to obtain an unbalanced structure dominated by martensite (also obtain bainite or maintain single-phase austenite as required). ) of a heat treatment process. Quenching is the most widely used method in heat treatment of Kehua steel. Kehua's steel heat treatment generally has four basic processes: annealing, normalizing, quenching and tempering. Annealing heats the workpiece to an appropriate temperature, adopts different holding times according to the material and workpiece size, and then performs slow cooling (the slowest cooling rate) to make the internal structure of the metal reach or close to the equilibrium state, and obtain good process performance and performance. Or prepare the tissue for further quenching. Normalizing heats the workpiece to a suitable temperature and then cools it in the air. The effect of normalizing is similar to that of annealing, but the obtained structure is finer. It is often used to improve the cutting performance of materials, and is sometimes used as a Final heat treatment. What is quenching? Tempering In order to reduce the brittleness of steel parts, the quenched steel parts are kept at an appropriate temperature higher than room temperature but lower than 710 ℃ for a long time, and then cooled. This process is called tempering. Quenching is a heat treatment process in which the workpiece is heated to austenitize and cooled in an appropriate way to obtain martensite or bainite structure. The most common are water-cooled quenching, oil-cooled quenching, air-cooled quenching, etc. Annealing, normalizing, quenching, and tempering are the 'four fires' in the overall heat treatment. Among them, quenching and tempering are closely related and are often used in conjunction with each other. Purpose The purpose of quenching is to transform supercooled austenite into martensite or bainite to obtain martensite or bainite structure, and then tempering at different temperatures to greatly improve the rigidity, hardness, and resistance of steel. Grinding, fatigue strength and toughness, etc., so as to meet the different requirements of various mechanical parts and tools. It can also meet the special physical and chemical properties of some special steels such as ferromagnetism and corrosion resistance through quenching. What is quenching After reading the above content, everyone must have a concept about what quenching is, but there is still a lot of knowledge involved in quenching. If you want to know more clearly, you can pay attention to our website.