郑铖武,王泽力,王大政,袁兴栋.碳钢表面喷丸诱导低温B-Cr-Re共渗研究[J].表面技术,2020,49(5):293-298.
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].Surface Technology,2020,49(5):293-298 |
| 碳钢表面喷丸诱导低温B-Cr-Re共渗研究 |
| Low Temperature B-Cr-Re Co-infiltration Induced by Shot Peening on Carbon Steel Surface |
| 投稿时间：2019-09-19 修订日期：2020-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.05.035 |
| 中文关键词: 喷丸 低温 预处理 B-Cr-Re共渗 位错 |
| 英文关键词:shot peening low temperature preprocessing B-Cr-Re co-infiltration dislocation |
| 基金项目:山东省高等学校科技计划项目（J17KA017）；山东建筑大学博士基金（XNBS1625）；山东建筑大学研究生课程建设项目（YZKG201603，ALK201602，ALK201710，ALK201808）；山东省社会科学规划研究项目（19CHYJ12） |
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| Author | Institution |
| ZHENG Cheng-wu | School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China |
| WANG Ze-li | School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China |
| WANG Da-zheng | School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China |
| YUAN Xing-dong | School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China |
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| 中文摘要: |
| 目的 进一步拓宽低温B-Cr-Re共渗技术的应用。方法 采用喷丸技术对20钢表面进行预处理，处理的时间分别为0.5、1.0、1.5 h，然后进行低温B-Cr-Re固体共渗及其力学性能研究，共渗温度为600 ℃和650 ℃，保温时间6 h。利用高分辨透射电子显微镜、扫描电子显微镜、X射线衍射仪等，对预处理后基体表层结构和B-Cr-Re低温扩散层组织结构及力学性能进行表征。结果 经喷丸处理后，基体表层发生严重塑性变形，晶粒发生破碎并逐渐细化，获得平均晶粒尺寸分别为50、58、65 nm的纳米结构层，晶界明显增多。预处理时间越长，基体表层变形程度越严重，获得的纳米结构越明显；同时由于原子排列发生错排，阻碍了基体表层位错等缺陷的运动，故在基体表层观察到高密度位错等结构缺陷。经喷丸处理后，600 ℃下处理不同时间的B-Cr-Re低温共渗层组织连续、均匀，存在孔洞，平均深度约为7、8、7 μm，650 ℃下处理不同时间的B-Cr-Re低温共渗层组织连续、均匀、致密，平均深度约为21、24、22 μm，力学性能良好。结论 喷丸处理后，基体表层存在较多的晶界和高密度位错，为后续B-Cr-Re的低温共渗提供了更多结构和能量支持，降低了B原子的扩散激活能，提高了B原子的扩散速度。这项工作为低温B-Cr-Re共渗技术的应用拓宽了领域。 |
| 英文摘要: |
| 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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