Low-cycle fatigue life prediction method considering microstructure influence

A low-cycle fatigue, microstructure technology, applied in instrumentation, computer material science, design optimization/simulation, etc., can solve the problem of not establishing the quantitative relationship between fatigue life and microstructure, and achieve uniform error distribution, universal applicability, prediction high precision effect

Active Publication Date: 2020-07-24
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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  • Low-cycle fatigue life prediction method considering microstructure influence
  • Low-cycle fatigue life prediction method considering microstructure influence
  • Low-cycle fatigue life prediction method considering microstructure influence

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Embodiment Construction

[0034] Such as 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 combustors, turbine disks, blades and guide vanes, is selected. The composition of the alloy is Ni 52.80, Cr 18.73, Nb 5.24, Mo3.02, Al 0.52 , Ti 0.95, C 0.026, Co 0.03, Fe balance.

[0036] Inconel 718 nickel-based superalloy was machined into six standard low-cycle fatigue samples, 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 systems to obtain different average grain sizes of matrix phases and equivalent precipitation phases (γ′, γ″). The radius and volume fraction are respectively marked as heat treatment system I an...

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Abstract

The invention provides a low-cycle fatigue life prediction method considering microstructure influence, and solves the technical problem that a traditional life model does not predict the low-cycle fatigue life based on a microstructure. The method comprises the following steps: (1) processing a nickel-based superalloy into a standard low-cycle fatigue sample; (2) carrying out a low-cycle fatiguetest on the nickel-based superalloy low-cycle fatigue sample under the working conditions of certain temperature and strain amplitude, and obtaining fatigue stress, elastic strain, plastic strain andlow-cycle fatigue life in the fatigue test process; (3) carrying out a light microscope metallographic structure observation test and a transmission electron microscope microstructure observation test, and carrying out statistical calculation on the average grain size of a matrix phase and the equivalent radius and volume fraction of a precipitated phase; and (4) based on the three-parameter lifemodel, establishing a low-cycle fatigue life prediction model considering the influence of the microstructure. The model can predict the low-cycle fatigue life of the nickel-based superalloy based onthe 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 microstructure. Background technique [0002] Nickel-based superalloys exhibit high high-temperature strength, excellent oxidation resistance, excellent gas corrosion resistance, good creep performance, excellent fatigue performance 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 engines. Stricter requirements were put forward. With the increase in the application fields of supera...

Claims

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Application Information

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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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