W18Cr4V2Co8 heat treatment process:
Preheat a 870 to 820, from 1270 a 1290 grading quenching, the temperature levels of 540-560, then 580 degrees for three tempering, tempering heat 1 hour.
W18Cr4V2Co8 contain large amounts of alloying elements: plastic is poor, poor thermal conductivity, in the fast heating of the thermal stress to the deformation of crack, so the heating to the quenching temperature
1270 a 1280 a 840 degree preheated at 800, those of complex shape, but also an increase in a preheated 500 a 650. V, W, etc. play a major increase from the rigid elements of the red
Only under very high temperature to dissolve, but too high a temperature will make the coarse grains, and the W, A, alloying elements are reduced, making the eutectic eutectoid temperature increase, thus
Select the 1270 a 1280 degrees. Direct air-cooled, will analyze the precipitation of secondary carbides, thereby reducing the red hardness of steel.
W18Cr4V2Co8 quenched carbide ten organizations for M + residual A (up to 30%) 550 a 570 degree tempered in precipitation caused by secondary hardening WC, A decomposition analysis of C, to reduce compliance
Gold element content, so that Ms increased, resulting in secondary hardening, tempering time, and 15% of the residual A, second tempering residual A3% to 5%,
Three tempering, only 1% to 2%, the final was tempered carbides of M ten ten very small amount of residual
