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Nano-technology of thermal-mechanical composite process for improving fatigue strength of titanium alloy

A fatigue strength and composite process technology, applied in the field of metal processing, can solve the problem of not improving the fatigue strength of titanium alloys, and achieve the effect of improving fatigue strength and expanding engineering applications.

Inactive Publication Date: 2016-05-25
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the titanium alloy fatigue strength by thermomechanical composite process nano-technology, which solves the problem that the existing titanium alloy metal surface nano-strengthening method cannot improve the titanium alloy fatigue strength

Method used

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  • Nano-technology of thermal-mechanical composite process for improving fatigue strength of titanium alloy
  • Nano-technology of thermal-mechanical composite process for improving fatigue strength of titanium alloy
  • Nano-technology of thermal-mechanical composite process for improving fatigue strength of titanium alloy

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Embodiment 1

[0034] Example 1: The first shot peening, steel shot diameter 1mm, shot peening time 1 hour, shot peening speed 40 m / s, shot peening distance 400mm; surface damage repair heat treatment temperature 150 ° C, holding time 50min, the second shot Shot treatment, steel shot diameter 0.5mm, shot peening time 20min, shot peening speed 40m / s.

Embodiment 2

[0035] Embodiment 2: The first shot peening, steel shot diameter 1mm, shot peening time 2 hours, shot peening speed 60 m / s, shot peening distance 500mm; surface damage repair heat treatment temperature 300 ° C, holding time 60min, the second shot Shot treatment, steel shot diameter 0.5mm, shot peening time 20min, shot peening speed 60 m / s.

Embodiment 3

[0036] Embodiment 3: The first shot peening, steel shot diameter 1mm, shot peening time 3 hours, shot peening speed 70 m / s, shot peening distance 600mm; surface damage repair heat treatment temperature 450 ° C, holding time 70min, the second shot Shot treatment, steel shot diameter 0.5mm, shot peening time 20min, shot peening speed 70m / s.

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Abstract

The invention discloses a method of nano-crystallizing a heat engine compound process for improving the fatigue strength of a titanium alloy. The technical scheme adopted by the invention is as follows: the method comprises the steps: performing long-term shot blasting on the surface of the titanium alloy at a higher shot blasting speed, wherein the diameter of a steel shot is 1 mm, the shot blasting time is 1-3 hours, the shot blasting speed is 40-70 meters / second, the shot blasting distance is 400-600 mm; performing surface damage repair heat treatment on the titanium alloy subjected to high-energy nano-crystallization and shot blasting, and repairing under the conditions of a treatment temperature is 150-450 DEG C and the insulation time is 50-70 min; and performing shot blasting treatment on the surface of the thick titanium alloy repaired in the step 2 once, wherein the diameter of the steel shot is 0.5 mm, the shot blasting time is 20 min, the shot blasting speed is 40-70 meters / second. The method has the beneficial effects that the fatigue strength of the titanium alloy can be remarkably improved, thus the project application of the titanium alloy, especially an important application prospect in fields such as aviation and transportation equipment with requirements of high speed, large power and light weight is greatly enlarged.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and relates to a nanometerization method of thermomechanical composite process for improving fatigue strength of titanium alloy. Background technique [0002] In the past 10 years, there have been researches on various surface nano-strengthening methods at home and abroad. The main method is to carry out severe plastic deformation and nano-strengthening of the metal surface through mechanical strengthening methods such as shot peening or rolling, or some researchers have strengthened the surface after strengthening. Then heat to eliminate the surface residual stress due to mechanical strengthening. However, the existing two types of methods have little effect on improving the fatigue strength of titanium alloys, and even reduce its fatigue limit. Titanium alloy is a very important new alloy for the development and application of modern aerospace technology, and has great application pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 温爱玲王生武闫秀霞杨军永李丽魏岩于文夫
Owner DALIAN JIAOTONG UNIVERSITY
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