Ultrasonic Rolling Strengthening Experiment and Pressure Parameter Optimization on Surface of SCX400 Wheel Steel
In order to improve the surface strength of SCX400 wheel steel, ultrasonic rolling technology was used to strengthen the surface. The pressure parameters were optimized by means of experimental test. Results showed that increasing the ultrasonic rolling pressure was helpful to obtain the deformation...
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| Main Author: | |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Materials Protection
2021-05-01
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| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20210519.pdf |
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| Summary: | In order to improve the surface strength of SCX400 wheel steel, ultrasonic rolling technology was used to strengthen the surface. The pressure parameters were optimized by means of experimental test. Results showed that increasing the ultrasonic rolling pressure was helpful to obtain the deformation layer with larger thickness. There was a strong plastic deformation in the tissue near the surface, and the deformation degree in the transition zone was decreased, while the internal microstructure remained basically unchanged. Nanocrystals with a size of about 5 nm were formed in the surface tissues when 100 N ultrasonic rolling was applied. As the rolling pressure continued to increase to 400 N, a higher proportion of amorphous microstructure was obtained on the surface of the sample. The surface hardness of SCX400 wheel steel was decreased as a whole with the increase of depth. When the rolling pressure was increased to 300 N and 400 N, the microhardness of the area 50 μm from the surface was 371 HV and 383 HV, respectively. The residual compressive stress of surface layer was increased continuously with the increase of ultrasonic rolling pressure. In the process of increasing the rolling pressure, the depth of residual stress was also increased significantly. After the completion of ultrasonic rolling, the microstructure lattice of the alloy was changed, and the compressive residual stress was formed. |
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| ISSN: | 1001-1560 |