Generally, 960 ~ 1100 °C can be hardened and hardened, and the grains are not easy to grow; for the molds that are mainly wear-failure and subject to relatively large stresses, the quenching heating temperature should be lower; for the requirements of thermal hardness and corrosion resistance For molds with good performance, the quenching heating temperature should be higher.1 Forged steel-bonded cemented carbide contains more titanium carbide, tungsten carbide and other high melting point carbides, the continuity of the matrix is ​​poor, and pores, looseness, inclusions, segregation,

cracking, uneven or partial carbide particles often occur Poly, etc. And other phenomena. After quenching, the matrix structure in the steel cemented carbide can be transformed into martensite + a small amount of residual austenite + Hard phase organization., affect the performance of steel bonded carbide. Not only can it be shaped by forging, but more importantly, it can disperse the hard phase uniformly in the steel matrix, reduce the segregation tendency of alloy carbides, and promote the rounding and refinement of coarse and sharp tungsten carbide and titanium carbide

. Therefore, for the requirements For high-precision molds, the processing size should be appropriately controlled according to the expansion rule of boronized workpieces. This change is conducive to effectively reducing production costs and improving production efficiency on the premise of satisfying the requirements of mold use. 2.4 Surface strengthening treatment The typical surface strengthening treatment of steel-bonded carbide mold is boronizing treatment, it Can more fully develop the potential of steel combined with cemented carbide

. The boride formed on the surface Infusion three-way valve of the mold can fill the pores of the sintered alloy, improve the density of the alloy, improve the microstructure of the mold surface, and improve the hardness, wear resistance, hot hardness, corrosion resistance and fatigue resistance of the mold surface layer The properties of resistance, abrasion resistance, anti-adhesion and anti-occlusion greatly improve the product quality and service life of steel-bonded cemented carbide molds

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