Explanation

After heating and austenitizing, the steel shall be quenched in a medium with strong cooling capacity (such as water) for rapid cooling, and then transferred to a medium with weak cooling capacity (such as oil or air) for further cooling, finally obtaining the heat treatment process of martensite structure. There are many kinds of cooling medium selected, such as water oil, water air, oil air, oil nitrate, water nitrate, nitrate oil, etc., which can be selected according to the hardenabilhy, shape, size and deformation requirements of steel. T. The residence time of the part in the first medium is a very important parameter during two-liquid quenching. If the residence time is too long, it can not reduce deformation and prevent cracking; If the workpiece is quenched into the second medium too early, the cooling rate of the medium is slow due to the high temperature of the workpiece. During the cooling process, the non martensite structure transformation will occur, which will reduce the service performance of the T-piece. The advantage of two-liquid quenching is that it can reduce the internal stress of the workpiece and the resulting deformation and cracking tendency

Classification