The invention relates to a
titanium alloy ultrasonic knife surface strengthening method which comprises the following steps: (1)
machining the
titanium alloy ultrasonic knife surface,
grinding and
polishing; (2) cleaning the
titanium alloy ultrasonic knife which satisfies the
surface roughness requirement, and
drying; (3) putting the
titanium alloy ultrasonic knife into an
ion nitriding furnace, and carrying out
nitriding treatment, wherein the
nitriding treatment technological parameters are as follows: the pole
pitch is 30-50mm, the
cathode bias is less than or equal to 300V, the inside of the
ion nitriding furnace is subjected to
argon gas scrubbing for
oxygen removal and vacuumized to the
vacuum pressure of less than 5Pa, the gas medium filled in the
ion nitriding furnace is NH3, the gas flow rate is 300-400 L / h, the nitriding pressure is 80-120Pa, the nitriding temperature is 800-1000 DEG C, and the nitriding time is 3-7 hours; and after the nitriding treatment is finished, carrying out furnace cooling on the
titanium alloy matrix in an
argon environment to
room temperature, and discharging. Compared with the prior art, after the treatment of the technique, the
hardness is enhanced by 2-3 times as compared with the
titanium alloy matrix which is not subjected to ion nitriding treatment, and the abrasion resistance is enhanced by 8-25 times. The titanium alloy ultrasonic knife surface treated by the method has the characteristics of high abrasion resistance, high
oxidation resistance and favorable high-temperature stability.