Bearing quenching process, the medium and cooling method

Processing and high temperature bearing quenching process, quenching medium and cooling method processing temperature of heating steel AC3 AC1 points or more, insist on a certain amount of time, and then at the right rate of cooling, martensite and ( Or) Heat treatment process of bainite. Progress and is the purpose of quenching hardness, strength, wear resistance, the use of the system performance to satisfy the different parts. Quenching widely application, such as tools, measuring tool, mold, high temperature bearing, spring, automobile, tractor, diesel engine, cutting tools, pneumatic tools, with an open, drilling machinery, agricultural machinery, petroleum machinery, chemical machinery, textile machinery, aircraft in a part of the quenching process. （ 1) Quenching can heating system temperature quenching heating temperature data based on the steel composition, microstructure and performance of different requests for sure. Hypoeutectoid steel is AC3 + ( 30～50℃） ； Eutectoid steel and hypereutectoid steel is AC1 + ( 30～50℃） 。 When hypoeutectoid steel quenching temperature is lower than the ac3, the steel has not yet been fully austenitizing, and there are local transformation ferrite. Due to the hardness of ferrite is low, make the hardness after quenching can't meet the requirements, can also affect the other mechanical properties. When the quenching temperature is much higher than ac3 of hypoeutectoid steel austenite grain coarsening, quenching performance is damaged. Using the ac3 + ( 30 - 50°c) As hypoeutectoid steel quenching heating temperature, not only ensure the austenitizing fully, and adhere to the fine austenitic grain size. Hypereutectoid steel quenching heating temperature of the general introduction of AC1 + ( 30～50℃） 。 Also in the consumption of practice on the basis of proper progress about 20 ℃ condition. In the heating temperature range, the organization for the small grain size of austenite and small local average spread not dissolve carbide. In addition to a handful of residual austenite after quenching in vitro, its organization for lamellar martensite matrix on the average spread of fine carbide particles. Such high hardness, wear resistance, and brittle is relatively small. Hypereutectoid steel quenching heating temperature data cannot be significantly lower than the AC1, because China has not yet been fully austenitic steel market in China at this time. If heated to just above the AC1 temperature, the pearlite to complete transformation austenite, and a small amount of cementite into austenite. The austenitic grain size small, and the carbon has a slightly higher scores of quality management and eutectoid compounds. If we continue to rise and temperature, the secondary cementite dissolving in austenite from time to time, the austenitic grain size grew up from time to time, the carbon concentration increases, the occasional causes quenching deformation is gradually increasing aptitude, quenching technology organization through microscopic crack development and the brittleness increases. Companies at the same time due to a high carbon austenite, the number of residual austenite after quenching continues to increase, reduce the production workpiece hardness and abrasion resistance. Thus hypereutectoid steel quenching heating temperature level above AC1 too much are not appropriate, ACm heated to complete austenitizing temperature or above research should not be more appropriate. Consumerism theory when choosing a workpiece quenching heating temperature, in addition to abide by the above to the ordinary line, also think of artifacts in chemical composition, technical service request, size shape, the original development of social organizations, and by heating equipment, the influence of the cooling medium, and many other factors, the heating temperature be adjusted properly. The previous: the technical characteristics and application of bearing fault area next up: none