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Reinforcement method for extending fretting fatigue life of material at high temperature

A technology of fretting fatigue and conditions, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of fretting fatigue damage failure, increased roughness, high hardness, etc., to improve the fretting fatigue life , large residual stress, and the effect of improving thermal fatigue performance

Inactive Publication Date: 2010-04-28
JIANGSU UNIV
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Problems solved by technology

However, the aluminide coating formed during the aluminizing process has high hardness, increased roughness, and low toughness, and the material is very sensitive to fretting fatigue damage in a high-temperature environment, so it is prone to occur in the fretting fatigue process dominated by fatigue. Fretting fatigue damage failure, which has directly constituted an important factor affecting the safe use of high-temperature materials in equipment operation

Method used

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  • Reinforcement method for extending fretting fatigue life of material at high temperature
  • Reinforcement method for extending fretting fatigue life of material at high temperature
  • Reinforcement method for extending fretting fatigue life of material at high temperature

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Embodiment 1

[0019] Take TC11 titanium alloy as an example (TC11 is a nearly α+β type two-phase titanium alloy, which is an important aviation and aerospace material. This alloy has the advantages of high specific strength, good medium temperature performance, good corrosion resistance, and light weight. It has been used in parts such as compressor discs, blades and drums of aero-engines and aircraft structural parts. Its chemical composition (mass fraction, %) is Al 5.8-6.8, Mo 2.8-3.8, Zr0.8-2.5, Si 0.2 ~0.4, Fe 0.4, C 0.1, N 0.05, H 0.015, O 0.15, the balance is Ti)

[0020] 1. Clean the TC11 titanium alloy before heat treatment. The β-phase transition temperature of the alloy was determined by X-ray diffraction analysis to be 1000±20°C, and double annealing heat treatment was performed, that is, 950°C for 1h, air cooling + 580°C for 6h, and air cooling. A continuous layer of TiO can be formed on its surface 2 +Al 2 o 3 A mixed oxide film that enhances the bonding of the aluminide c...

Embodiment 2

[0025] figure 2The effects of laser strengthening, low temperature aluminizing and laser shock strengthening on the fretting fatigue life of 12CrMoV steel at high temperature of 350 ℃ were compared. It can be seen that the low-temperature aluminized 12CrMoV steel reduces the high-temperature fretting fatigue life by 1.8 times. The reason is that although the low-temperature aluminized strengthening layer on the surface of 12CrMoV steel has high hardness and strong wear resistance, its toughness is low, and even quenching cracks appear. Laser strengthening increases the fretting fatigue life of 12CrMoV steel by 3.4 times at high temperature. This is mainly due to the fact that the residual compressive stress introduced by laser strengthening inhibits crack growth. The surface residual compressive stress introduced by laser strengthening not only weakens the effective FF driving stress, but also slows down the fretting wear, so it also has a certain delay effect on the initia...

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Abstract

The invention discloses a reinforcement method for extending fretting fatigue life of a material under high temperature. The reinforcement method effectively combines a calorization technology and a laser impact reinforcement technology; and after a part is calorized, the surface of the part is processed in a laser impact reinforcement compounding way, so that high-amplitude residual compressive stress and high dislocation density are formed on the surface, thereby being beneficial to increasing the surface friction coefficient, improving the fretting wear performance and enhancing the fretting fatigue resistance. The part processed by the reinforcement method has the advantages of high wear resistance, corrosion resistance and high-temperature oxidation resistance, and the fretting fatigue life of the part under high temperature is greatly extended.

Description

technical field [0001] The invention relates to the technical field of material processing and surface strengthening application of metal components, in particular to a method for improving the fretting fatigue performance of metal materials and alloy materials under high-temperature fatigue conditions and prolonging the fatigue life of workpieces by a combination of aluminizing and laser shock treatment technology , especially suitable for surface strengthening modification of important hot-end parts in aerospace, nuclear energy, machinery manufacturing and petrochemical industry. Background technique [0002] In recent years, with the vigorous development of petroleum, chemical, nuclear energy and aerospace industries, the requirements for the working environment of many equipment have become more and more stringent. Equipment parts not only have to bear more complex mechanical loads and thermal loads, but also have to bear Oxidation and corrosion. Although some high-temp...

Claims

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Application Information

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IPC IPC(8): C23C10/48C23C10/60
Inventor 任旭东张田张永康姜大伟冯爱新朱圣才
Owner JIANGSU UNIV
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