Tungsten radical the function of hard alloy

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  • source:SEENER CNC Machining
YT kind alloy, ISO calls P kind (main component is WC-TiC-Co) ; YG kind alloy, ISO says for K kind (main component is WC-Co) . Hardness carbide WC, TiC the hardness that wait is very tall, so alloy whole also has tall hardness, it is commonly between HRA89~93. The hardness of hard alloy is worth along with the property of carbide, amount and granuality change, reduce along with the grow in quantity of binder content again. When binder content is identical, the alloy of WC-Co of hardness prep above of WC-TiC-Co alloy. The hardness of hard alloy lifts as temperature again and reduce. When 700~800 ℃ , partial alloy is maintaining be equivalent to high-speed steel the hardness when normal temperature, another part alloy is some lower. The high temperature hardness of alloy still depends on the hardness that carbide issues in high temperature, the high temperature hardness of reason WC-TiC-Co alloy is some taller than WC-Co alloy. Add TaC(NbC) to be able to raise high temperature hardness. The bending strength of hard alloy of commonly used brand is in bending strength and tenacity 0.

90~1.

Inside 50GPa limits. Binder content is higher, criterion bending strength is higher also. When binder content is identical, the bending strength of WC-TiC-Co alloy always is under WC-Co alloy, drop as the addition of the content of TiC. Hard alloy is brittleness material, its pound tenacity to be the 1/8~1/30 of high-speed steel only below normal temperature. Tenacity is not worth the weakness that is hard alloy. Reason hard alloy cutting tool is alloy bit solders or clip solid is in commonly knife handle (cutter hub) on use, hob of some small modulus gear or little hard alloy bit and establish the whole of ability make it such as milling cutter. With the circumstance of bending strength, WC-TiC-Co kind tenacity under WC-Co kind. Coefficient of thermal conductivity because the coefficient of thermal conductivity of TiC under WC, WC-TiC-Co alloy coefficient of thermal conductivity is so lower than WC-Co alloy, increase as the content of TiC and drop. Linear expansion coefficient in general, the linear expansion coefficient of hard alloy is smaller than high-speed steel much. The linear expansion coefficient of WC-TiC-Co alloy is more than WC-Co alloy, increase as the addition of the content of TiC. Because the linear expansion coefficient of WC-Co alloy is smaller than WC-TiC-Co alloy, and WC-Co alloy bending strength is higher, coefficient of thermal conductivity is bigger, the inclination that crackle produces when soldering so is less than WC-TiC-Co alloy. Fight cold welding sex hard alloy and the high-speed steel of temperature prep above that steel produces cold welding, the alloy of WC-Co of temperature prep above of WC-TiC-Co alloy and steel happening cold welding CNC Milling CNC Machining