A method for evaluating ultra-high cycle fatigue properties of carburized steel

A technology of fatigue performance and evaluation method, which is applied in the direction of strength characteristics, instruments, and the use of repeated force/pulsation force to test the strength of materials, etc., can solve the problems of low core strength and inability to accurately evaluate the fatigue performance of carburized steel, and achieve shortening Evaluate the effect of time

Active Publication Date: 2022-07-29
CENT IRON & STEEL RES INST
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Problems solved by technology

However, carburized steel is a non-homogeneous material, and its surface hardness is higher after carburizing, while the core strength is lower. Ultrasonic fatigue adopts tension and compression loading methods, which cannot accurately evaluate the fatigue performance of carburized steel.

Method used

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  • A method for evaluating ultra-high cycle fatigue properties of carburized steel
  • A method for evaluating ultra-high cycle fatigue properties of carburized steel
  • A method for evaluating ultra-high cycle fatigue properties of carburized steel

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Embodiment

[0034] Taking 18CrNiMo7-6 carburized steel for high-speed iron gear as an example, the evaluation methods of other carburized steels are similar and can be implemented by reference.

[0035] Material preparation: according to figure 1 The size of the sample shown is for processing the fatigue blank sample, leaving a machining allowance of 0.2mm on each side of the working section for subsequent finishing.

[0036] Carburizing treatment: The carburizing agent is propane and the diluent methanol, and the protective gas is nitrogen. The carburizing process includes strong infiltration, diffusion, quenching, tempering and other processes. The carburizing process of different samples is different, and the hardness distribution of the samples after carburizing is as follows: figure 2shown.

[0037] (1) Carburizing layer sample: The carburizing temperature of the sample is 930 ° C. First, it is intensively infiltrated under 1.1% carbon potential for 12 hours, and then diffusion ca...

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Abstract

An evaluation method for ultra-high cycle fatigue performance of carburized steel belongs to the field of material fatigue performance evaluation methods. The specific steps of the method include: according to the characteristic requirements of the carburized layer of the material application target, adjust the carburizing process to obtain simulated samples of the structure state of the carburized layer, the transition layer and the matrix layer respectively, and use ultrasonic fatigue testing equipment to respectively test different samples. The fatigue performance of the samples in the microstructure state is evaluated by the lifting method, and the fatigue limit S-N curve is obtained. Through comparative analysis, the minimum value of different groups of samples can be regarded as the safe fatigue limit of the carburized steel. This method adopts ultrasonic testing method for fatigue testing, which can be used for 10 7 More than once a week, such as 10 9 , 10 10 Compared with rotational bending fatigue, the fatigue performance evaluation of ultra-high cycle carburized steel can shorten the evaluation time by more than 95%. This method can be applied to different material systems such as aluminum alloys, titanium alloys, etc., and can also be used to evaluate the fatigue properties of other materials with heterogeneous microstructures.

Description

technical field [0001] The invention belongs to the field of performance evaluation of carburized steel, in particular to an evaluation method for ultra-high cycle fatigue performance of carburized steel, which can perform ultra-high cycle fatigue performance evaluation on non-uniform structures such as carburized steel. Background technique [0002] Workpieces subjected to cyclic loads often experience fatigue failure, causing the workpiece or equipment to fail to work properly. Therefore, the fatigue properties of the selected materials must be considered during the design and manufacture of the workpiece, and the evaluation of the fatigue limit of the material has also become a necessary part of the application of steel for structural parts. . Currently widely used material fatigue evaluation methods include rotational bending fatigue, rolling contact fatigue and other methods. 7 The high cycle fatigue limit under cycle conditions, that is, the material is considered to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32G01N3/02
CPCG01N3/32G01N3/02G01N2203/0073
Inventor 尉文超王毛球何肖飞时捷孙挺闫永明李晓源徐乐
Owner CENT IRON & STEEL RES INST
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