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High temperature quenching improves the thermal strength of steel

by:Kehua     2022-07-23
High temperature quenching can improve the thermal strength of steel well, which is very helpful for the processing of some products, and this process is also necessary. It is used in many industries. The following will be Xiaobian and Kehua and Let's take a look at the relevant information together. High temperature quenching High temperature quenching High temperature quenching refers to a quenching process that increases the quenching temperature from normal As+30-50 degrees Celsius to As+300 degrees Celsius. The purpose is to improve the fracture toughness of structural steel. For example, some medium carbon alloy steels are quenched at a high temperature of 1200-1255 degrees Celsius to completely dissolve the alloy carbides, eliminating the possibility of undissolved carbides as microcrack nucleation, and the fracture toughness is increased by 70-125%. At the same time, the harmful impurities such as Sn and As adsorbed on the grain boundaries are diffused uniformly. It has been found that lath martensite is formed after high temperature quenching, and there is a stable retained austenite film (10-20nm) between the laths, which is beneficial to toughness. High temperature quenching High temperature quenching can also significantly improve the impact toughness of steel. High temperature quenching can reduce the irreversible temper brittleness and eliminate the reversible temper brittleness in the case of excluding the non-martensitic structure. High temperature quenching also has a good effect on the fatigue limit of steel. For example, after high temperature deformation quenching and 300 ℃ tempering, the fatigue limits of 55Si2 and 50CrMnA steels are 617MPa and 588MPa respectively, while those after ordinary heat treatment are 519MPa and 510MPa respectively, even if the fatigue limit is increased by about 20%. In addition, high temperature deformation quenching can also improve the thermal strength, fracture toughness and crack propagation work of steel. High-temperature quenching Principle and requirements High-temperature quenching process is a composite heat treatment process in which the blank of steel or workpiece is heated to a stable austenite region, and after a suitable heat preservation time, deformation and quenching are performed above the recrystallization temperature. The high temperature quenching process has no special requirements for steel, and can be realized on carbon steel and low alloy steel. In addition, because the deformation temperature is high, the deformation is easy to carry out, so the deformation can be carried out in general forging and rolling equipment, so it has been widely used than low temperature deformation quenching. The application of high temperature quenching is indeed very wide, and many large industrial plants will have these equipment, which provides great help for their own product customization. If you want to know more, then pay attention to Kehua.
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