engleski

Spheroidization of eutectic carbides in the high-speed steels under annealing

The two phases will be in equilibrium in high speed steels by heating under isothermal holding conditions. These are solid solution (austenite) and carbides. This difference in the curvature of the interfacial surface leads to the chemical inhomogeneity of the solid solution. The concentration of carbon and alloying elements at the tip of the plate is greater than at the flat interface. A concentration difference is created. Sufficiently long isothermal holding at high temperatures leads to diffusion transfer of carbon atoms and alloying elements from the tip to the flat boundary. Spheroidization leads to fragmentation of the network of eutectic carbides into separate plates and to their termination into equiaxed rounded crystals, which significantly improves the properties of steel.

eutectic carbides ; high-speed steels ; isothermal holding conditions

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