After the workpiece is rapidly heated using a high-frequency induction heating power supply, it must be quickly cooled immediately so that the surface of the workpiece can be quenched.
1) For medium carbon steel workpieces, the more convenient and cheap quenching cooling medium is water, and water spray cooling is commonly used. When water is sprayed, the cooling rate is larger.
2) For carbon steel workpieces and alloy steel workpieces that are prone to quenching and cracking, in addition to the oil quenching and oil injection quenching used in the old process, polymers are now widely used as quenching cooling media with additives. Foreign products include Ucon, 251, 364, etc., and our country also has a variety of products. The mass fraction of this polymer quenching cooling medium is 5%-15%, and the temperature is usually controlled at 15-50°C.
The surface color of induction hardened workpieces can often tell us whether the heating temperature is correct. When the workpiece is quenched, blue appears on the surface, which generally indicates that the heating temperature is insufficient. After quenching, the entire surface of the workpiece appears off-white, which generally indicates that the heating temperature is too high. Normally quenched surface should appear dotted beige with light black discontinuous oxide scale.
The appropriateness of the cooling medium is directly related to the quenching quality of the workpiece. Therefore, it is very necessary to understand the commonly used quenching cooling media. This article briefly introduces the commonly used quenching cooling media for different workpieces, hoping to be helpful to your heat treatment work.
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GS-ZP-1200
