Forging method for improving mechanical property of TC4 alloy blade

A technology of mechanical properties and alloys, applied in the direction of mechanical equipment, engine components, etc., can solve problems such as poor strength, and achieve the effect of optimizing forging process parameters

Inactive Publication Date: 2012-01-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency of poor mechanical strength of existing TC4 titanium alloy blades, the present invention provides a forging method for improving the mechanical properties of TC4 alloy blades

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Step 1. Solid-state hydrogenation: After cleaning the surface of a TC4 alloy cylinder with a diameter of 39mm×262mm with acetone, put it into a tubular solid-state hydrogenation furnace, and vacuumize it to 1.0×10 -3 Pa, heated to 700°C at a speed of 10°C / min, kept at a temperature of 10min, filled with 0.5% hydrogen according to the weight percentage of the titanium alloy billet, the flow rate of the filled hydrogen was 0.5L / min, kept at a temperature of 3h, and kept at a temperature of about 10°C / min. Cool down to room temperature at a speed of 1 min; step 2, mechanical processing: machine the solid hydrogenated titanium alloy into a solid hydrogenated titanium alloy prefabricated billet; step 3, sand blowing and grinding: blow the surface of the solid hydrogenated titanium alloy prefabricated billet Sanding and grinding; Step 4, Spraying lubricant: Spray Tianli Chuang brand Ti-5D glass lubricant on the surface of the solid hydrogenated titanium alloy prefabricated bil...

Embodiment 2

[0015] Step 1. Solid-state hydrogenation: After cleaning the surface of the TC4 alloy cylinder with a diameter of 39mm×262mm with acetone, put it into a tubular solid-state hydrogenation furnace, and evacuate it to 1.5×10 -3 Pa, heated to 850°C at a speed of about 15°C / min, kept at a temperature of 10 minutes, filled with 0.2% hydrogen according to the weight percentage of the titanium alloy billet, and the flow rate of filled hydrogen was 1L / min, kept at a temperature of 2h, and kept at a temperature of about 5°C / min. Cool down to room temperature at a speed of 1 min; step 2, mechanical processing: machine the solid hydrogenated titanium alloy into a solid hydrogenated titanium alloy prefabricated billet; step 3, sand blowing and grinding: perform sand blasting on the surface of the solid hydrogenated titanium alloy prefabricated billet and grinding treatment; step 4, spraying lubricant: spray Tianli Chuang brand Ti-5D glass lubricant on the surface of the solid hydrogenated t...

Embodiment 3

[0018] Step 1. Solid-state hydrogenation: After cleaning the surface of a TC4 alloy cylinder with a diameter of 39mm×262mm with acetone, put it into a tubular solid-state hydrogenation furnace, and vacuumize it to 1.0×10 -3 Pa, heated to 800°C at a speed of about 10°C / min, kept at a temperature of about 15 minutes, filled with 0.2% hydrogen according to the weight percentage of the titanium alloy billet, and the flow rate of the filled hydrogen was 1.5L / min, kept at a temperature of about 2 hours, at about 10°C Cool to room temperature at a speed of 1 / min; step 2, mechanical processing: machine the solid state hydrogenation titanium alloy into a solid hydrogenation titanium alloy prefabricated billet; step three, sand blowing and grinding: blow the surface of the solid state hydrogenation titanium alloy prefabricated billet Sanding and grinding; Step 4, Spraying lubricant: Spray Tianli Chuang brand Ti-5D glass lubricant on the surface of the solid hydrogenated titanium alloy pr...

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Abstract

The invention relates to a forging method for improving the mechanical property of a TC4 alloy blade, which is used for solving the technical problem of poor mechanical strength in a traditional TC4 titanium alloy blade. The invention has the technical scheme that the forging method comprises the following steps of: carrying out solid hydrogen distributing treatment on the TC4 alloy; machining the obtained solid hydrogen distributing titanium alloy blank after treatment into a solid hydrogen distributing titanium alloy prefabricated blank; blowing sand and polishing; spraying a lubricating agent; heating before forging; forging the solid hydrogen distributing titanium alloy blank to obtain a solid hydrogen distributing titanium alloy blade forging piece; removing flash; blowing sand and polishing; and removing hydrogen. The TC4 titanium alloy is subjected to solid hydrogen distributing treatment, so that the tensile strength of the TC4 titanium alloy at room temperature is improved to be 1055-1065MPa from 925-985MPa in the background art; the yield strength of the TC4 titanium alloy at room temperature is improved to be 990-1000MPa from 884-945MPa in the background art; the tensile strength of the TC4 titanium alloy at 400DEG C is improved to be 700-710MPa from 630-675MPa in the background art; and the yield strength of the TC4 titanium alloy at 400DEG C is improved to be 605-615MPa from 593MPa in the background art.

Description

technical field [0001] The invention relates to a forging method of a titanium alloy blade, in particular to a forging method for improving the mechanical properties of a TC4 alloy blade. Background technique [0002] The working conditions of turbofan aeroengine fan blades are relatively harsh, and titanium alloys have a series of advantages such as high specific strength, corrosion resistance and high temperature resistance, which makes titanium alloys widely used in the field of fan blades. High specific strength is a significant advantage of titanium alloys. GJB2744-1996 stipulates the mechanical performance indicators of TC4 alloy forgings: the tensile strength at room temperature is not less than 895MPa, the yield strength is not less than 825MPa; the tensile strength at 400°C is not less than 600MPa, and the yield strength is not less than 560MPa . [0003] Document 1 "Study on Precision Forging Process of TC4 Titanium Alloy Gas Turbine Blades, Li Xiaoqin, Zhu Xiping...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K3/04
Inventor 李淼泉于卫新罗皎朱堂葵
Owner NORTHWESTERN POLYTECHNICAL UNIV
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