Heat treatment of the YuNDK35T5 alloy
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On the basis of the diagram of the isothermal transformation of the β2-solution in the YuNDK35T5 alloy we have shown the possibility of quenching this alloy from two temperature ranges: 1260–1240 and 900–850°C.
The cooling rate at the higher temperatures must be no lower than 100°/min. A lower cooling rate induces high temperature decomposition, and as the result there is a sharp decrease of the magnetic qualities.
Cooling at 820–600°C must be carried out at the rate of 20–30°/min.
We recommend isothermal treatment at the temperature at which the decomposition is most intense (700°C).
External magnetic field is effective at the temperature at which the decomposition begins (formation of nuclei). When the cooling rate is about 20°/min the magnetic field is effective at 800–760°C.
One must use multistage tempering for the YuNDK35T5 alloy.
KeywordsMagnetic Field Heat Treatment Cool Rate External Magnetic Field Sharp Decrease
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