Method for estimating fatigue failure critical inclusion size of high-strength steel
A fatigue failure, high-strength steel technology, applied in the direction of strength characteristics, the use of stable tension/pressure testing material strength, measuring devices, 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. Practical and easy to operate
Active Publication Date: 2021-03-12
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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The invention discloses a method for estimating the fatigue failure critical inclusion size of high-strength steel, and belongs to the technical field of fatigue fracture failure criteria of high-strength steel. The method is based on a fracture mechanics principle, a mechanism for inducing fatigue fracture of the high-strength steel by the inclusions is given from the perspective of energy, the high-strength steel with different strength and toughness matching is obtained by using different heat treatment systems to carry out tensile, fracture toughness and elastic performance tests, and thefatigue failure critical inclusion size of the high-strength steel is estimated by using an energy criterion. And then an ultrahigh-cycle fatigue test is carried out to verify the effectiveness of themethod provided by the invention. According to the estimation method provided by the invention, the critical inclusion size of the fatigue fracture failure of the high-strength steel can be predictedthrough a static mechanical property test, and corresponding experimental evidences and theoretical bases are provided for material selection and design for prolonging the service life of engineeringmaterials and economically and reasonably controlling the inclusion size for metallurgy.
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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Login to View More 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