| YUAN Xing-dong,LI Zi-zhe,FANG Tong-hui,JIANG Wen-tao,WANG Xue-gang.Shot Peening Assisted B-Cr-Re Diffusion on Carbon Steel at Low Temperature[J],51(9):335-341, 350 |
| Shot Peening Assisted B-Cr-Re Diffusion on Carbon Steel at Low Temperature |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.035 |
| KeyWord:shot peening B-Cr-Re co-infiltration low temperature nanostructure dislocation |
| Author | Institution |
| YUAN Xing-dong |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| LI Zi-zhe |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| FANG Tong-hui |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| JIANG Wen-tao |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| WANG Xue-gang |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
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| Abstract: |
| The work aims to improve the diffusion behavior of B atom on the carbon steel surface at low temperature, and broaden the application of low-temperature B-Cr-Re co-infiltration technology. The annealed 45 steel was used as the substrate, and the surface was treated with emery shot peening, then the B-Cr-Re co-infiltration was carried out at low temperature to obtain a certain depth of co-infiltration layer. The shot peening time was 0.5, 1.0 and 1.5 h respectively, and the low-temperature co-infiltration process was kept at 580 ℃ for 6 h. TEM, TFESEM, SEM and XRD were used to study the microstructure of the substrate surface layer after shot peening and the microstructure and mechanical properties of B-Cr-Re co-infiltration layer. According to the experimental results, after shot peening, the surface microstructure of 45 steel substrate was in a plastic unstable state, and structural defects such as dislocations, amorphous regions and twin structures appeared in the surface layer, and nano-structured layers were obtained in the surface layer. With the extension of shot peening time, the surface grains of the substrate gradually broke and refined, and the average grain size was 180, 70 and 20 nm, respectively. After shot peening, a uniform, continuous and dense B-Cr-Re layer was obtained on the surface of the shot peening substrate at low-temperature co-infiltration, which was in the shape of branch, with an average depth of 20, 22 and 23 µm, respectively, about 54%, 69% and 77% higher than that of untreated substrate (average depth was 13 µm). The structure of B-Cr-Re co-infiltration layer was FeB phase and Fe2B phase, with Fe2B phase as the main component. The mechanical properties of the co-infiltration layer were superior, and the microhardness was 875HV~2 042HV. After shot peening, the surface grain of carbon steel is refined, the grain boundary and dislocations increases obviously. The grain boundary and dislocations plays a fast channel role in the diffusion of subsequent atoms, providing energy, increasing the diffusion rate of B atoms and lowering the B-Cr-Re infiltration temperature. This surface treatment technology provides a better method for strengthening the surface of carbon steel. |
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