A Method for Predicting the Fatigue Strength of Metallic Materials at Different Temperatures Based on Microstructure Dispersion
A technology of microstructure and fatigue strength, applied in the direction of testing the hardness of materials, testing the strength of materials by applying repetitive force/pulsation force, and analyzing materials, can solve the problems of reducing the service safety of components, increasing the service cost of components, and time-consuming, etc., to achieve The effect of reducing the demand for test volume, high applicability, and improving fatigue strength
Active Publication Date: 2021-11-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0003] Since fatigue testing, especially high temperature fatigue testing, is time-consuming, labor-intensive, and expensive, if comprehensive and accurate fatigue data or fatigue strength cannot be used to predict the constitutive relationship in the design and preparation of components, the service cost of components will be greatly increased and the service safety of components will be reduced. , and cause irreparable losses
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Embodiment 1
[0033] This embodiment is to predict the performance of vermicular graphite cast iron material in high cycle fatigue working condition, the specific process is as follows:
[0034] First, the vermicular graphite cast iron material is taken from the diesel engine cylinder head, and the temperature range of the high cycle fatigue condition is determined to be 25-500°C according to the service condition.
[0035] Second, choose three typical temperatures: 25°C, 400°C and 500°C; the fatigue strength test method chooses the lifting method, the stress amplitude increase or decrease is 10MPa, and the fatigue test is in accordance with GB / T 3075-2008 Metal Material Fatigue Test Axial Force The control method is carried out, and the calculation of fatigue strength is carried out according to the statistical scheme and analysis method of the fatigue test data of metal materials in GB / T 24176-2009. Three typical temperature S-N curves, the schematic diagram is as follows figure 2 .
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The invention discloses a method for predicting the fatigue strength of metal materials at different temperatures through the microhardness dispersion of the microstructure, and belongs to the technical field of material science and engineering application. In this method, high-cycle fatigue tests are carried out at different temperatures first, and the fatigue strength (σ w ); then obtain the microhardness value of the microstructure from the fatigue samples at different temperatures, obtain the microstructure dispersion (G) at different temperatures, establish the quantitative relationship between the fatigue strength and the microstructure dispersion, and then pass a certain Hardness testing at temperature predicts fatigue strength at the corresponding service temperature. This method can achieve high-efficiency and accurate prediction of fatigue strength at corresponding temperatures through a small amount of high-cycle fatigue and microhardness tests.
Description
technical field [0001] The invention relates to the technical field of high-cycle fatigue strength testing of metal materials, in particular to a method for predicting the fatigue strength of metal materials at different temperatures through microstructure and microhardness dispersion. Background technique [0002] Automobiles, trains, ships, and airplanes are the staples of modern transportation. Among them, automobiles have become the first choice for daily transportation because of their flexibility, speed and convenience. At present, the automobile transportation industry is facing problems such as rapid growth in transportation demand, depletion of fossil energy and rising fuel prices. Improving the power per unit volume or power per unit mass of internal combustion engines, that is, power density, is an effective way to solve this problem. As the heart of automobiles, the current research focus on internal combustion engines is to improve power density and reliability...
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IPC IPC(8): G01N3/32G01N3/40G06F30/20G06F119/08
CPCG01N3/32G01N3/40G01N2203/0005G01N2203/0073G01N2203/0076
Inventor 庞建超朱刚张振军宫柏山张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI