Process for strengthening and toughening bearing titanium alloy

A titanium alloy, strengthening and toughening technology, applied in the field of strengthening and toughening of bearing titanium alloys, can solve problems affecting the performance of titanium alloys, and achieve the effects of controllable oxide layer thickness, high hardness and good wear resistance.

Inactive Publication Date: 2013-09-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Put the TC11 titanium alloy bearing after grinding and polishing into an electric heating furnace at room temperature, and vacuumize to 10 -3 Pa; pass into the argon gas with a purity of 99.99%, and the ventilation flow rate is 20SLM. The SLM is the unit of liters per minute under standard conditions. When the air pressure in the electric heating furnace is 0.01MPa, stop feeding argon gas; for electric heating Heat the furnace until the temperature is 450°C, keep it warm for 20 minutes, extract argon gas during the heat preservation, and feed in oxygen with a purity of 99.99%, the ventilation flow rate is 20SLM, and the pressure in the electric heating furnace is kept at 0.015MPa; the temperature of the electric heating furnace is heated To 1050°C, the heating rate is 5°C / min; keep warm for 1 hour; cool down, the cooling rate is 5°C / min, down to 500°C; stop ventilation, and turn off the ventilation valve and electric heating furnace power supply, and the in...

Embodiment 2

[0017] Embodiment 2: The TC11 titanium alloy bearing after grinding and polishing is placed in the electric heating furnace, and vacuumized to 10 -3 Pa; Introduce argon gas with a purity of 99.99% at a flow rate of 20SLM until the pressure in the electric heating furnace is 0.01MPa, then stop the argon gas; heat the electric heating furnace to a temperature of 450°C and keep it warm for 20 minutes. The argon gas was pumped out at the same time, and oxygen with a purity of 99.99% was fed in at a flow rate of 20SLM to keep the pressure in the electric heating furnace at 0.015MPa; the temperature of the electric heating furnace was heated to 1020°C, and the heating rate was 5°C / min; the heat preservation time was 1.5 Hours; cool down at a rate of 5°C / min, down to 500°C; stop ventilation, and turn off the vent valve and the power supply of the electric heating furnace, and take out the titanium alloy bearing when the indoor temperature of the electric heating furnace drops to room ...

Embodiment 3

[0018] Embodiment 3: Put the TC11 titanium alloy bearing after grinding and polishing in an electric heating furnace, and vacuumize to 10 -3 Pa; Introduce argon gas with a purity of 99.99% at a flow rate of 20SLM until the pressure in the electric heating furnace is 0.01MPa, then stop the argon gas; heat the electric heating furnace to a temperature of 450°C and keep it warm for 20 minutes. The argon gas is extracted from time to time, and oxygen with a purity of 99.99% is introduced, the ventilation flow rate is 20SLM, and the pressure in the electric heating furnace is kept at 0.015MPa; the temperature of the electric heating furnace is heated to 1050°C, and the heating rate is 5°C / min; Hours; cool down at a rate of 5°C / min, down to 500°C; stop ventilation, and turn off the vent valve and the power supply of the electric heating furnace, and take out the titanium alloy bearing when the indoor temperature of the electric heating furnace drops to room temperature.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 罗勇许浩田茂财杨莉陈文文
Owner CHINA UNIV OF MINING & TECH
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