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Judgment method for fatigue failure of titanium alloy at room temperature

A technology of load fatigue and fatigue failure, which is applied to measuring devices, material analysis through optical means, instruments, etc., can solve problems such as incorrect conclusions and difficulties in the strength of load fatigue failure effects

Active Publication Date: 2017-11-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it becomes difficult to judge the strength of the load fatigue failure and its effect solely from the degree of life reduction, and sometimes even draw incorrect conclusions

Method used

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  • Judgment method for fatigue failure of titanium alloy at room temperature
  • Judgment method for fatigue failure of titanium alloy at room temperature
  • Judgment method for fatigue failure of titanium alloy at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Determination of fatigue failure of Ti6242 alloy under load at room temperature

[0044] Ti6242 alloy adopts such as figure 2 The samples shown are in accordance with image 3 The two types of fatigue waveforms shown are loaded until fracture. The LCF and LCDF fatigue fractures of Ti6242 alloy were observed by optical microscope, such as Figure 4 shown. It can be judged according to the degree of lightness and darkness on the respective fractures that the crack initiation position of the LCF fracture is at the far right end of the figure, which is the initiation on the surface of the sample; observing the LCDF fracture, it can be found that there are many and scattered bright areas on the fracture, basically distributed in the sub-surface of the sample Surface or interior, presenting multi-point initiation.

[0045] The cleavage facets of the initiation region on the fracture surface of Ti6242 alloy LCF and LCDF were further enlarged and observed with a...

Embodiment 2

[0049] Example 2: Determination of fatigue failure of Ti6243 alloy under load at room temperature

[0050] Ti6243 alloy adopts such as figure 2 The samples shown are in accordance with image 3 The two types of fatigue waveforms shown are loaded until fracture. The LCF and LCDF fatigue fractures of Ti6243 alloy were observed by optical microscope, such as Figure 9 shown. It can be judged according to the degree of light and darkness on the respective fractures that there are two crack initiation positions on the fracture of the LCF, respectively at the bottom end and the rightmost end of the figure, both of which are initiated on the surface of the sample; observing the fracture of the LCDF, it can be found that there is a bright area inside the sample on the fracture ( As indicated by the arrow), but it is significantly less than the LCDF fracture in Example 1. At the same time, at the far right end of the fracture, a region similar to the brightness of the LCF fracture...

Embodiment 3

[0054] Example 3: Determination of Fatigue Failure of Ti6244 Alloy at Room Temperature

[0055] Ti6244 alloy adopts such as figure 2 The samples shown are in accordance with image 3 The two types of fatigue waveforms shown are loaded until fracture. Using an optical microscope to observe the LCF and LCDF fatigue fractures of Ti6244 alloy, such as Figure 11 shown. It can be judged according to the degree of lightness and darkness on the respective fractures that both the LCF and LCDF fractures are fatigue cracks initiated from the surface of the sample, and the initiation position is at the far right end of the fracture diagram.

[0056] Comparing the secondary cracks of Ti6244 alloy LCF and LCDF fracture longitudinal sections can be found, such as Figure 12 As shown, most of the secondary cracks in the longitudinal sections of LCF and LCDF are inclined and form an angle of about 45° with the stress axis.

[0057] This situation shows that the Ti6244 alloy does not hav...

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Abstract

The invention discloses a method for judging fatigue failure of titanium alloy under load at room temperature, and belongs to the technical field of fatigue failure of titanium alloy. This method is to use optical microscope and scanning electron microscope to observe the fracture after fatigue failure and the secondary cracks in the longitudinal section of the fracture, and make a comprehensive judgment based on the fatigue crack initiation position on the fracture, the characteristics of the initiation area, and the secondary crack morphology of the longitudinal section. of. The invention has the advantage that it can accurately identify the failure caused by the load fatigue behavior in the titanium alloy and the strength of the load fatigue effect during the failure process. Through the establishment of relevant evaluation standards, it can provide reference for the laboratory research on the fatigue behavior of titanium alloys under load, the evaluation of the load effect of titanium alloys and the analysis of fracture failure.

Description

Technical field: [0001] The invention relates to the field of titanium alloy fatigue failure, in particular to a method for judging titanium alloy fatigue failure at room temperature, which can determine whether the titanium alloy fatigue failure is caused by load fatigue and the strength of the load fatigue effect. Background technique: [0002] As a class of lightweight and high-strength materials, titanium alloys are widely used in the aerospace field. Among them, nearly α-type and α+β-type titanium alloys are used to manufacture compressor disks, fan disks and their blades of aero-engines due to their excellent creep and fatigue resistance. Accurate prediction of the fatigue life of these important components is the key to ensure the safety of aircraft flight. Usually, fatigue tests are carried out on the materials used in the components in the laboratory stage and the platform test stage to obtain their fatigue life, and according to certain safety design rules, the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84
Inventor 邱建科冯新马英杰雷家峰刘羽寅杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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