| ZHENG Cheng-wu,WANG Ze-li,WANG Da-zheng,YUAN Xing-dong.Low Temperature B-Cr-Re Co-infiltration Induced by Shot Peening on Carbon Steel Surface[J],49(5):293-298 |
| Low Temperature B-Cr-Re Co-infiltration Induced by Shot Peening on Carbon Steel Surface |
| Received:September 19, 2019 Revised:May 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.05.035 |
| KeyWord:shot peening low temperature preprocessing B-Cr-Re co-infiltration dislocation |
| Author | Institution |
| ZHENG Cheng-wu |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| WANG Ze-li |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| WANG Da-zheng |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
| YUAN Xing-dong |
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan , China |
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| Abstract: |
| The work aims to further improve the application of low temperature B-Cr-Re co-infiltration technology. The surface of 20 steel was pretreated by shot peening for 0.5, 1.0 and 1.5 h, respectively. Then, the low temperature B-Cr-Re solid co-infiltration was carried out to study the mechanical properties. The co-infiltration temperature was 600 ℃ and 650 ℃, and the holding time was 6 h. The surface structure of substrate and the microstructure and mechanical properties of B-Cr-Re low temperature co-infiltration layer were characterized by high resolution transmission electron microscopy, scanning electron microscopy and X-ray diffractometry. After shot peening, the surface of the substrate showed severe plastic deformation, and the grains were gradually refined to obtain a nanostructure layer with an average grain size of about 50, 58 and 65 nm. The grain boundary was obviously increased. The longer the pretreatment time was, the more severe the deformation of the surface layer of the substrate was, and the more obvious the nanostructure was obtained. At the same time, due to the misalignment of the atomic arrangement, the movement of defects such as surface dislocations of the substrate was hindered. The structural defects such as high density dislocations were observed in the surface layer of the substrate. After shot peening, the structure of B-Cr-Re low temperature co-infiltration layer at 600 ℃ was continuous, uniform and porous and the average depth was about 7, 8 and 7 μm. The structure of B-Cr-Re low temperature layer co-infiltration at 650 ℃ was continuous, uniform and dense, the average depth was about 21, 24 and 22 μm, and the mechanical properties were superior. There are more grain boundaries and high-density dislocations in the surface after shot peening, which provides energy support for the subsequent low-temperature co-infiltration of B-Cr-Re, reduces the diffusion activation energy of B atoms and improves the diffusion rate of B atoms. This work broadens the field for the application of low temperature B-Cr-Re co-infiltration technology. |
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