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
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[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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