研究目的
Investigating the expediency of using ultrasonic treatment in combination with laser hardening for U8, U10, X12M steels and studying the effect of ultrasonic longitudinal and torsional acoustic vibrations on the intensification of an increase in the concentration of point defects in the crystal structure.
研究成果
The introduction of a longitudinal and torsional ultrasonic field by transforming longitudinal ultrasonic vibrations made it possible to form a highly concentrated effect, which led to an increase in the effects of laser hardening. Ultrasonic treatment before laser hardening allows to increase the depth of the hardened layer by 15-25%, increase the hardness of the surface layers by 25-30% compared with hardened layers on an unprepared surface.
研究不足
The study focuses on specific steels (U8, U10, X12M) and the effects of ultrasonic treatment in combination with laser hardening. The optimal duration of ultrasonic processing must be chosen empirically, which may limit the generalizability of the findings.
1：Experimental Design and Method Selection:
Pulsed laser surface treatment was carried out on a Kvant-16 technological unit with a change in the radiation power density in the range of 80-100 MW / m
2：Ultrasonic vibrations with a frequency of 2 kHz and an amplitude of 10 μm were continuously supplied to the sample perpendicular to the surface under study. Sample Selection and Data Sources:
No less than 7 samples with dimensions of 10*10*15 mm were subjected to surface treatment for each hardening option.
3：List of Experimental Equipment and Materials:
Kvant-16 technological unit, ultrasonic generator UZG 1-1, magnetostrictive transducer PMS 1-1, longitudinal ultrasonic waveguide, MIM-7 and Neophot-21 microscopes, EM-MA-4 electron microscope, PMT-3 device, DRON-
4：5 diffractometer. Experimental Procedures and Operational Workflow:
Microstructures were examined on transverse and longitudinal sections using microscopes. The fine structure of the treated layers was studied using an electron microscope. Microhardness measurements were carried out on a PMT-3 device. The phase composition in the heat-affected zones was identified by the method of depth X-ray diffraction analysis.
5：Data Analysis Methods:
The studies were carried out on a DRON-0.5 diffractometer in filtered FeKa-radiation with intensity recording by scintillation counters. X-ray line profiles were taken in continuous recording mode at a speed of 1 deg/min.
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