METHOD FOR DETERMINING CRITICAL HARDENING TEMPERATURE IN TITANIUM ALLOYS Russian patent published in 2023 - IPC G01N25/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of studying the processes of martensitic transformations in metals and solid-phase metal alloys and can be used, for example, in research centres or in the technical control departments of metallurgical plants producing titanium and alloys based on it. A method is claimed for determining the critical hardening temperature T_cr in titanium alloys, including determining the chemical composition of the titanium alloy and the polymorphic transformation temperature T_pt, finding the upper limit of the range of T_cr by performing a thermodynamic calculation of changes in the phase composition of the alloy in the temperature range from 600°C to T_pt +(5…50)°C according to the chemical composition of the alloy, checking the adequacy of the calculation by comparing the temperatures T_pt obtained by test hardening and T_pt obtained as a result of thermodynamic calculation, with a difference of less than 10°C, then calculate the change in the value of the molybdenum equivalent from the heating temperature, determine the temperature _Tcr0, which corresponds to the value of the molybdenum equivalent of 11 wt.%, heating and hardening are carried out at temperatures T_cr0 - 10°C and T_cr0 - 20°C, the temperature T_cr is determined from the quenching performed as the average value between the two adjacent temperatures at which martensite is and is not found in the structure.

EFFECT: increase in the accuracy of the data obtained.

1 cl, 4 dwg, 1 tbl