Casting the purpose of quenching process

Kunshan casting factory quenching the purpose of the undercooled austenite for martensite or bainite transformation, to get martensite or bainite structure, and then with the tempering at different temperatures in order to significantly improve the rigidity of steel, hardness , Wear resistance, fatigue strength and toughness, so as to meet a variety of mechanical parts and tools for different use requirements. Can also be quenched to meet certain special steel ferromagnetic, corrosion resistance and other special physical and chemical properties.

According to the cooling method, the quenching process is divided into four types: one-liquid quenching, two-medium quenching, martensitic grading quenching and bainitic isothermal quenching.

The metal workpiece is heated to a suitable temperature and maintained for a period of time, then immersed in quenching medium rapid cooling of metal heat treatment process. Commonly used quenching medium salt water, water, mineral oil, air and so on. Quenching can improve the hardness of metal parts and wear resistance, which is widely used in a variety of workers, molds, measuring tools and requirements of the surface wear parts (such as gears, rollers, carburizing parts, etc.). Through quenching and tempering with different temperatures, can greatly improve the metal strength, toughness decreased and fatigue strength, and can get the cooperation between these properties to meet the different requirements.

Another hardening can also make some special properties of steel to obtain certain physical and chemical properties, such as quenching stainless steel to improve its corrosion resistance, permanent magnet steel to enhance its ferromagnetic and so on. Quenching process is mainly used for steel. Commonly used steel in the heated to above the critical temperature, the original at room temperature will be all or most of the organization into austenite. The steel is subsequently immersed in water or oil for rapid cooling, and the austenite is transformed into martensite. Compared with other steel, martensite hardness is the highest. Quenching the rapid cooling will produce internal stress within the workpiece, when its large to a certain extent, the workpiece will be distorted or even cracking. For this reason, a suitable cooling method must be selected.