Calculation method of fatigue limit distribution of ti1023 components based on residual stress layer and microhardness layer
A technology of microhardness and residual stress, which is applied in the direction of testing material hardness, analyzing materials, strength characteristics, etc., can solve the problem that the mechanism and law of fatigue performance are not clear enough, and achieve intuitive, fast and reasonable, improve quality and simple method Effect
Active Publication Date: 2019-05-17
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
However, the understanding of the mechanism and law of the influence of the gradient change of the metamorphic layer on the fatigue performance is not clear enough.
How to quickly and intuitively judge the size and distribution of residual stress, and whether the size and distribution of hardness are reasonable, there are few reports in the existing literature
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Embodiment Construction
[0084] The Ti1023 plate-shaped tensile-tension fatigue test piece (K) with a thickness of 3mm processed by the integrated process of milling-polishing-shot peening-polishing t = 1) is taken as an example to illustrate the specific implementation steps of the present invention.
[0085] To test the surface metamorphic layer of Ti1023 fatigue specimen, the specific steps are as follows:
[0086] Step 1. Use the residual stress test system LXRD MG2000 (Proto, Canada) to test the residual stress, the radiation is Cu-Ka, the Bragg angle is 142°, the diffraction crystal plane is {hkl-213}, and the exposure area is 0.5mm 2 , The exposure time is 2s, the number of exposures is 10, the voltage is 25KV, and the current is 30mA. Use the electrochemical polishing method to strip the test piece to obtain the residual stress values at different depths until the measured residual stress is zero; the etching solution ratio is CH 3 OH: C 6 H 14 O 2 : HCIO 4 =59:35:6;
[0087] The microhardness test...
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Abstract
The invention discloses a component fatigue limit distribution calculation method based on residual stress and microhardness layer. The method specifically includes the steps of: 1. testing the residual stress and a microhardness value of a surface metamorphic layer in a component under different depths; 2. conducting digital modeling of residual stress and microhardness along depth distribution on test data obtained by step 1; 3. determining the relationship between the microhardness HV and the fatigue limit sigma w, and establishing fatigue limit distribution including the microhardness layer; and 4. according to a result obtained by step 3 and Goodman relationship, seeking fatigue limit distribution containing the residual stress layer and microhardness layer. The method provided by the invention is simple, can quickly acquire the fatigue limit of the component at different depths, and can realize rapid judgment of the residual stress and microhardness distribution rationality.
Description
Technical field [0001] The invention belongs to the technical field of fatigue limit calculation, and relates to a method for calculating the fatigue limit distribution of a Ti1023 component based on a residual stress layer and a microhardness layer. Background technique [0002] Decades of service practice has proved that fatigue failure accounts for 50-90% of mechanical component failures, and fatigue failures account for more than 80% of aviation components. Especially for key components such as aircraft and engines, fatigue is the failure mode most threatening to safe service. For a long time, people have used surface geometric features such as surface roughness and surface microcracks as the main basis for measuring the quality of surface processing. In fact, the damage to the structure of many important parts mostly starts in the range of tens of micrometers below the surface. The gradient changes of the microstructure, residual stress and microhardness in the metamorphic ...
Claims
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IPC IPC(8): G01N3/40G01L5/00
CPCG01L5/0047G01N3/40G01N2203/0073G01N2203/0676
Inventor 姚倡锋武导侠张定华任军学田荣鑫周征张吉银
Owner NORTHWESTERN POLYTECHNICAL UNIV