What is quenching treatment? What is the purpose of quenching?

Speaking of quenching, many friends may not know what it is from! So what is quenching treatment? What are the purposes of quenching? What are the commonly used quenching methods? Let's take a look at the detailed introduction of Guangzhou Youzao! One , What is quenching treatment Quenching is to heat the steel to above the critical temperature, hold 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 keep it according to needs). A heat treatment process for single-phase austenite). 2. The purpose of quenching treatment The purpose of quenching is to transform the supercooled austenite into martensite or bainite to obtain martensite or bainite structure, and then tempering at different temperatures to greatly improve the steel. The rigidity, hardness, wear resistance, fatigue strength and toughness, etc., to meet the different requirements of various mechanical parts and tools. 3. Application of quenching Quenching process is widely used in modern machinery manufacturing industry. Important parts in machinery, especially steel parts used in automobiles, airplanes, and rockets, are almost all quenched. In order to meet the various technical requirements of various parts, various quenching processes have been developed. For example, according to the part to be treated, there are overall, local quenching and surface quenching; according to whether the phase transformation is complete during heating, there are complete quenching and incomplete quenching (for hypoeutectoid steel, this method is also called subcritical quenching); according to cooling The content of the phase transition includes graded quenching, isothermal quenching and under-speed quenching. Quenching treatment Fourth, commonly used quenching methods (1) Single-liquid quenching The quenching method in which the austenitized workpiece is cooled in a single quenching medium is called single-liquid quenching. Water-cooling quenching, brine quenching, oil-cooling quenching, and water-soluble polymer aqueous quenching are all single-liquid quenching. The quenching medium of single-liquid quenching is generally: carbon steel quenching water or water-soluble polymer aqueous solution, alloy steel quenching with oil, carbon steel with effective thickness less than 5mm or low hardness requirements can also be cooled in oil. The calculation method of cooling time is: 2~3mm/s in water, 2~3mm/min in oil at 20~80℃. (2) Double-medium quenching Double-medium quenching is to heat the workpiece to austenitization, first quench it into a medium with strong cooling ability, and immediately transfer it to a medium with weak cooling ability for cooling when the structure is about to undergo martensitic transformation. quenching method. The workpiece heated to austenite is cooled in a medium with strong cooling ability, and quickly bypasses the 'nose tip' of the austenite isothermal transformation curve to suppress the decomposition of austenite. In the interval, it is quickly transferred to another quenching medium with a slower cooling rate, so that the austenite can complete the martensitic transformation during the slow cooling process. Double medium quenching can effectively reduce distortion and prevent cracking while ensuring workpiece hardening. The most commonly used is water (or brine)-oil, water (or brine)-air dual medium quenching. (3) Staged quenching. Also known as martensitic graded quenching, after heating the workpiece to austenitize, it is immersed in a hot bath with a temperature slightly higher or lower than the Ms point for an appropriate time. After the workpiece as a whole reaches the medium temperature, it is taken out for air cooling to obtain Quenching method of martensite. Stage quenching is more effective than dual-media quenching for reducing distortion and preventing cracking. The key to graded quenching is that the cooling rate of the graded salt bath must be greater than the critical cooling rate, and the parts can ensure sufficient hardened layer depth. Different steel grades have different critical diameters during graded quenching, but they are all smaller than those of water quenching and oil quenching. Therefore, staged quenching is not suitable for the quenching of large-section carbon steel and low-alloy steel workpieces. What is quenching treatment? What are the purposes of quenching? What are the commonly used quenching methods? After reading the above information brought by Kehua Induction Heating Equipment, I believe everyone understands it clearly.
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