| XU Zizhen,ZHAO Tianyong,PENG Shaokun,WANG Meng,ZHAO Hongjia,NING Tengfei,MA Haoyang,WU He.Effect of Electropulsing on Surface Mechanical Behavior of 9SiCr Steel During Ultrasonic Rolling Process[J],53(19):186-192 |
| Effect of Electropulsing on Surface Mechanical Behavior of 9SiCr Steel During Ultrasonic Rolling Process |
| Received:June 16, 2023 Revised:August 09, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.017 |
| KeyWord:electropulsing ultrasonic rolling process 9SiCr roughness microhardness surface quality |
| Author | Institution |
| XU Zizhen |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| ZHAO Tianyong |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| PENG Shaokun |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| WANG Meng |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| ZHAO Hongjia |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| NING Tengfei |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| MA Haoyang |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
| WU He |
Shijiazhuang Haishan Industrial Development Corporation, Shijiazhuang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| In order to improve the surface hardness and finish of 9SiCr steel and obtain better surface quality, the rod-shaped samples of 9SiCr steel were turned, and then processed by ultrasonic rolling process (USRP) and high-energy electrical pulse-assisted ultrasonic rolling process (EP-USRP) with different parameters. Through surface roughness test, micro- topography test, surface Vickers microhardness test, the surface roughness, surface topography, and surface hardness gradient distribution in a certain depth of the surface of the samples in different processing conditions were evaluated respectively. The surface topography of the samples was analyzed by optical microscope and scanning electron microscope. The results showed that the surface topography of the turned samples was poor. The surface undulation was more obvious and the surface roughness was 0.45 μm. When USRP was applied, the surface quality of the samples was greatly improved, and the surface roughness was 0.043 μm when the pressure was 1 000 N. When the pressure continued to increase, the improvement of surface quality was no longer obvious. When the samples were processed by EP-USRP, it could be seen that the surface quality of the samples was be further improved. When the root mean square current density was 0.71 A/mm2, the surface roughness decreased to the minimum of 0.032 μm, which was 25.6% lower than that after USRP processing alone. The micro-hardness value of the turned samples was around 550HV. When USRP was applied, the surface hardness value of the samples was significantly increased, and the maximum value of 590HV was found when the processing pressure was 800 N, which was 7.3% higher than that of the turned samples. When the sample was processed by EP-USRP, the hardening effect of the surface layer of the sample was more obvious, which was embodied in the increase of the hardness value and the depth of the effect layer. When the root mean square current density was 0.71 A/mm2, the maximum value of the Vickers microhardness was 612HV, which was 3.8% higher than the maximum value after USRP processing. From the point of view of the depth of the hardening layer, the depth of the hardened layer after EP-USRP processing was significantly deeper than that after USRP processing. The radial surface to the heart of the sample was about 300 μm hardened after USRP processing, and the depth of the hardening layer could be increased to 400 μm after EP-USRP processing. From the microscopic morphology analysis, it could be seen that the surface layer of the sample had a certain depth of fine crystal layer. With different processing conditions, the grain size and the depth of the fine crystal layer were different. After EP-USRP processing, the depth of the surface fine crystal layer of the sample was increased, and the grains of the same depth were further refined. It can be seen that USRP and EP-USRP processing can improve the surface quality of 9SiCr steel to a certain extent. Electric pulses can improve the processing efficiency of USRP and further improve surface quality. |
| Close |
|
|
|