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| Co800基激光熔覆/重熔增强多物相复合层组织及耐磨性能 |
| Microstructure and Wear Resistance of Co800 Based Clad/Re-melt Multi-phase Composite Layer |
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| DOI：10.3969/j.issn.1674-6457.2023.05.022 |
| 中文关键词: 激光 钛合金 显微组织 磨损性能 表面改性 |
| 英文关键词: laser titanium alloy microstructure wear resistance surface modification |
| 基金项目: |
| Author Name | Affiliation | | LI Jia-ning | School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, China
Jinan Senfeng Laser Technology Co., Ltd., Jinan 250107, China | | XU Lian-yong | School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China |
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| 中文摘要: |
| 目的 增强钛合金表面耐磨损性能。方法 采用激光熔覆与激光重熔技术在TC4钛合金表面制备Co800–Si3N4–YPSZ(Y2O3部分稳定ZrO2)与Co800–Si3N4–YPSZ–MGOSs(单层氧化石墨烯薄片)复合层，并对熔覆层及重熔层微观组织结构、元素分布及耐磨损性能进行分析。结果 细晶强化作用改善了Co800–Si3N4–YPSZ–MGOSs熔覆层的耐磨性。激光重熔后，在熔池快速冷却过程中产生了非晶–纳米晶相，促进了多物相重熔层形成。MGOSs受热分解释放了C，在熔池中原位生成了Ti(CN)。结论 含有Ti5Si3、TiN及TiC等多种硬质增强相的Co800–Si3N4–YPSZ–MGOSs熔覆层的摩擦因数较TC4的摩擦因数降低，其磨损体积约为TC4磨损体积的1/7。 |
| 英文摘要: |
| The work aims to strengthen the wear resistance of titanium alloy surface. Co800-Si3N4-YPSZ (yttria partially stabilized zirconia) and Co800-Si3N4-YPSZ-MGOSs (monolayer graphene oxide sheet) composite layers were prepared on the TC4 titanium alloy by laser cladding/re-melting technology and the microstructure, element distribution and wear resistance of the clad/re-melt layers were analyzed. The wear resistance of Co800-Si3N4-YPSZ-MGOSs clad layer was enhanced by the fine grain strengthening. The amorphous and nanocrystalline phases were produced under an action of the rapid cooling rate of a laser induced pool after laser re-melting process, promoting the formation of multi-phase re-melt layer. MGOSs released C due to thermal decomposition in the laser induced pool, forming Ti(CN) by in-situ reaction. The friction coefficient of Co800-Si3N4-YPSZ-MGOSs clad layer is lower than that of TC4 due to the formation of the reinforcement phases such as Ti5Si3, TiN, TiC, etc., so the wear volume loss is about 1/7 of that of TC4. |
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