A method for estimating critical inclusion size for fatigue failure of high-strength steel
A fatigue failure and inclusion technology, applied in the direction of strength characteristics, the use of stable tension/pressure testing materials, instruments, etc., can solve the problem of difficulty in accurately evaluating the critical inclusion size of high-strength steel fatigue failure, and the method is simple and practical. , the effect of simple and convenient operation
Active Publication Date: 2022-03-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0004] The purpose of the present invention is to provide a method for estimating the critical inclusion size for fatigue failure of high-strength steel. The method provides a method for estimating the critical inclusion size for fatigue failure of high-strength steel based on the principle of fracture mechanics through static mechanical performance testing. It solves the problem that the critical inclusion size of high-strength steel fatigue failure is difficult to accurately evaluate, and provides a corresponding theoretical basis for engineering material selection, design, and metallurgical economic control of inclusion size
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Embodiment 1
[0052] The material used in this embodiment is AISI 4340 high-strength steel, which specifically includes the following steps:
[0053] (1) Sample preparation: First, obtain high-strength steels with different strength and toughness through different heat treatment systems; then use mechanical processing methods to prepare tensile samples, three-point bending fracture toughness samples, and elastic modulus samples, and use 2000# sandpaper Grind the surface of the sample.
[0054] (2) Static mechanical performance test: according to the national standard GB / T 228.1-2010, the tensile test is carried out to measure the tensile strength σ of high-strength steel b ;According to the national standard GB / T 4161-2007, a three-point bending fracture toughness test was carried out to measure the fracture toughness K of high-strength steel IC ; According to the national standard GB / T 22315-2008, the elastic modulus E and Poisson's ratio ν of the high-strength steel were measured by the ...
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Abstract
The invention discloses a method for estimating the critical inclusion size of high-strength steel fatigue failure, and belongs to the technical field of fatigue fracture failure criterion of high-strength steel. Based on the principle of fracture mechanics, this method gives the mechanism of fatigue fracture of high-strength steel induced by inclusions from the perspective of energy. High-strength steels with different strength and toughness matching are obtained by using different heat treatment systems for tensile, fracture toughness, and elastic performance tests. The energy criterion is used to estimate the critical inclusion size for fatigue failure of high-strength steel, and then the ultra-high cycle fatigue test is carried out to verify the effectiveness of the method of the present invention. The estimation method proposed by the present invention can predict the critical inclusion size of fatigue fracture failure of high-strength steel through static mechanical performance test, and provide corresponding support for improving the service life of engineering materials, material selection and design, and metallurgical economical and reasonable control of inclusion size Experimental evidence and theoretical basis.
Description
technical field [0001] The invention relates to the technical field of fatigue fracture failure criterion of high-strength steel, in particular to a method for estimating the critical inclusion size of high-strength steel fatigue failure. Background technique [0002] High-strength steel is used in a large amount and has a wide range of applications in modern industry. Because of its excellent comprehensive properties such as high strength and improved energy efficiency, it is widely used in aerospace, missiles, submarines and other cutting-edge defense science and technology fields, as well as turbine engines, wheel axles, Turbine blades, bearings and other civil economic fields have become important structural materials widely used in engineering parts. According to statistics, 50-90% of the damage of various moving components is caused by fatigue failure, and the fatigue failure of high-strength steel during service mainly originates from the largest non-metallic inclusio...
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IPC IPC(8): G01N3/10G01B21/00
CPCG01N3/10G01B21/00G01N2203/0003G01N2203/0017G01N2203/0067G01N2203/0073G01N2203/0075G01N2203/0682
Inventor 张鹏王鹏王斌庞建超张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI