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Vacuum Heat Treatment Furnace

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Typical Heat Treatment and Tempering Process of W18Cr4V Steel

The purpose of tempering is to precipitate dispersed M2C and MC carbides from m, produce secondary hardening effect and eliminate residual austenite and internal stress.

High tempering temperature is to improve the secondary hardening effect; More tempering times. On the one hand, the secondary hardening effect is enhanced, on the other hand (mainly) to reduce the content of retained austenite by secondary quenching, and indirectly improve the properties. See Figures 7, 8 and 9. (the microstructure after multiple tempering is tempered m + carbide).

Fig.1 Relationship between austenite composition and quenching T of W18Cr4V steel

Fig.2 Hardness change of W18Cr4V steel during tempering

Fig.3 Relationship between tempering times and retained austenite content and properties of W18Cr4V steel

In order to improve and improve the cutting efficiency and durability of high-speed steel cutting tools, surface strengthening methods are widely used, through surface chemical heat treatment or coating on the surface of cutting tools.

High-speed steel workpiece surface chemical heat treatment includes surface nitriding (such as glow ion nitriding, gas soft N), surface sulfur-ammonia co-infiltration or sulfur-nitrogen-boron multi-component co-infiltration, steam treatment, etc. None of these treatment temperatures exceeded 560°, and the microstructure and properties of the workpiece were not changed.

The surface coating of the workpiece is a TiC or TiN coating deposited on the surface of the workpiece by physical vapor deposition (PVD method).

PVD: is the abbreviation of Physical Vapor Deposition (Physical Vapor Deposition), which refers to the use of low-voltage, high-current arc discharge technology under vacuum conditions, using gas discharge to evaporate the target and ionize the evaporated material and gas. Using the acceleration of the electric field, the evaporated substances and their reaction products are deposited on the workpiece.