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A low-cycle fatigue life prediction method considering the influence of microstructure

A technology of low-cycle fatigue and microstructure, applied in the fields of instrumentation, computer material science, design optimization/simulation, etc., can solve problems such as the unestablished quantitative relationship between fatigue life and microstructure, achieve uniform error distribution, high prediction accuracy, and universal The effect of applicability

Active Publication Date: 2022-08-09
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

Existing research mainly focuses on the influence of microstructure on low cycle fatigue performance and crack initiation mechanism, and has not established a quantitative relationship between fatigue life and microstructure

Method used

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  • A low-cycle fatigue life prediction method considering the influence of microstructure
  • A low-cycle fatigue life prediction method considering the influence of microstructure
  • A low-cycle fatigue life prediction method considering the influence of microstructure

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Embodiment Construction

[0034] like figure 1 As shown, the present invention provides a low-cycle fatigue life prediction method considering the influence of microstructure.

[0035] Experimental material: Inconel 718 nickel-based superalloy, a commonly used material for key hot-end components such as aero-engine combustion chamber, turbine disk and blades and guide vanes, is selected. The composition of this alloy is Ni 52.80, Cr 18.73, Nb 5.24, Mo3.02, Al 0.52 , Ti 0.95, C 0.026, Co0.03, Fe balance.

[0036] Inconel 718 nickel-based superalloy was machined into 6 standard low-cycle fatigue specimens by machining, which were divided into two groups.

[0037] Two groups of low-cycle fatigue samples of Inconel 718 nickel-based superalloy were subjected to different vacuum high-temperature solution treatment and aging treatment regimes to obtain different average grain sizes of matrix phases and equivalent precipitation phases (γ′, γ″) The radius and volume fraction are marked as heat treatment syste...

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Abstract

The invention provides a low-cycle fatigue life prediction method considering the influence of microstructure, and solves the technical problem that the traditional life model does not predict the low-cycle fatigue life based on the microstructure. The steps are: (1) processing nickel-based superalloy into standard (2) Under the set temperature and strain amplitude conditions, carry out low-cycle fatigue experiments of nickel-based superalloy low-cycle fatigue samples, and obtain the fatigue stress and elastic strain during the fatigue test. , plastic strain and low-cycle fatigue life; (3) Carry out light microscope microstructure observation test and transmission electron microscope microstructure observation test, and statistically calculate the average grain size of the matrix phase and the equivalent radius and volume fraction of the precipitated phase; (4) ) Based on the three-parameter life model, a low-cycle fatigue life prediction model considering the influence of the microstructure is established, which can predict the low-cycle fatigue life of nickel-based superalloys based on the microstructure.

Description

technical field [0001] The invention belongs to the technical field of low-cycle fatigue life prediction methods, and in particular relates to a low-cycle fatigue life prediction method considering the influence of microstructures. Background technique [0002] Nickel-based superalloys show high high temperature strength, excellent oxidation resistance, excellent gas corrosion resistance, good creep properties, excellent fatigue properties and fracture toughness under high temperature conditions, and are widely used in aviation In aerospace and other fields, it has become a key material for its hot-end components such as turbine disks and blades. With the development of the aviation industry, the continuous improvement of the thrust-to-weight ratio, the gas temperature before the turbine and the boost ratio of the compressor is an important trend in the development of the engine. more stringent requirements. With the increase in the application fields of superalloys and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/04G06F119/14G16C60/00
CPCG16C60/00
Inventor 张鹏朱强王传杰陈刚郭斌
Owner HARBIN INST OF TECH AT WEIHAI
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