A method for heat treating a steel surface

By applying a single pulse current and ultrasonic shock vibration, the problems of high energy consumption, long cycle and cumulative damage in the existing technology are solved. The method realizes the nano-sizing of steel surface and performance improvement, significantly improves hardness and toughness, and extends fatigue life.

CN122168831APending Publication Date: 2026-06-09HUNAN VALIN ENERGY SAVING CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN VALIN ENERGY SAVING CO LTD
Filing Date
2026-04-27
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing composite energy field treatment technologies suffer from high energy consumption, long cycles, and the risk of cumulative damage from multiple treatments. Furthermore, the combination of electric pulses and ultrasonic vibrations fails to achieve efficient synergy in a single process, making it difficult to achieve the traditional surface heat treatment effect.

Method used

By employing a method of applying a single pulse current and ultrasonic shock vibration, and controlling parameters such as application time and frequency, instantaneous and efficient synergy between the thermal effect of the electropulse and the mechanical effect of ultrasonic vibration is achieved, thereby completing the nano-sizing and performance enhancement of the steel surface.

Benefits of technology

The process is simplified in a single treatment, the treatment cycle is shortened, cumulative damage is avoided, surface properties are significantly improved, grains are refined to the nanoscale, hardness and toughness are enhanced, and fatigue life is extended.

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Abstract

This invention provides a method for heat treatment of steel surfaces, comprising the following steps: simultaneously applying pulsed current and ultrasonic vibration to the steel, the application being performed once; the pulsed current application time being 2 min to 60 min; the ultrasonic vibration time being 2 min to 180 min; the pulsed current frequency being 600 Hz to 2200 Hz; the peak current of the pulsed current being 20 kA to 30 kA; the pulse width of the pulsed current being 150 μs to 250 μs; the duty cycle of the pulsed current being 20% ​​to 50%; and the ultrasonic vibration frequency being 10 kHz to 30 kHz, with an ultrasonic vibration amplitude of 40 μm to 100 μm. The steel surface heat treatment method provided by this invention can achieve instantaneous and efficient synergy between the electropulse thermal effect and the ultrasonic vibration mechanical effect in a single treatment, rapidly completing the nano-sizing and performance improvement of the steel surface. It features high efficiency, energy saving, and strong adaptability, and is suitable for surface heat treatment of key components in aerospace, rail transportation, nuclear power, and other fields.
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