Process for strengthening and toughening bearing titanium alloy

Abstract

The invention discloses a process for strengthening and toughening a bearing titanium alloy, belonging to alloy strengthening and toughening processes. The process specifically comprises the following steps of: a, grinding and polishing a titanium alloy bearing, subsequently putting the titanium alloy bearing into an electric heating furnace at the room temperature, and vacuumizing the electric heating furnace; b, introducing argon into the electric heating furnace till the pressure in the electric heating furnace is 0.01-0.015MPa, and stopping introducing the argon; c, powering on the electric heating furnace to heat up till the temperature is 400-600 DEG C, reserving the temperature for 15-25 minutes, pumping out the argon when the temperature is reserved, introducing oxygen of which the purity is 99.99% in an oxygen supply velocity of 10-60SLM, and keeping the pressure of the oxygen inside the electric heating furnace be 0.01-0.015MPa; d, raising the temperature of the electric heating furnace to be 950-1,250 DEG C; e, reserving the temperature for 0.5-5 hours; f, decreasing the temperature in a velocity of 4-6 DEG C / min till the temperature is 500 DEG C; g, stopping introducing the oxygen, and closing a gas supply valve and a heating power supply of the electric heating furnace; and h, taking out the titanium alloy bearing when the temperature of the electric heating furnace is decreased to be the room temperature. The process has the advantages that the titanium alloy bearing is high in surface hardness, the thickness of an oxidation layer is controllable, and the titanium alloy bearing is good in abrasive resistance.

Description

technical field [0001] The invention relates to an alloy strengthening and toughening process, in particular to a bearing titanium alloy strengthening and toughening process. Background technique [0002] TC11 alloy is a martensitic α+β type two-phase titanium alloy, which has the advantages of high specific strength, good medium temperature performance and good corrosion resistance, and has been widely used in the aerospace field. However, due to the problem of surface wear resistance in practical applications, the wear will increase during use. TC11 is a bearing titanium alloy, its wear resistance will greatly limit the application of TC11. [0003] High temperature oxidation treatment on the surface of TC11 is a method to improve the surface hardness of titanium alloy. At present, the surface oxidation treatment for titanium alloys has complex processes and long treatment time. At the same time, the hardness of the obtained oxide layer is not high, and the oxide layer i...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of strengthening and toughening process method of bearing titanium alloy, solve the problem that titanium alloy forms an oxide layer of impurities on the surface of titanium alloy through high temperature treatment in atmospheric environment, Problems Affecting the Performance of Titanium Alloys