卞宏友,谭煜凯,刘伟军,李强,王蔚.道间冷却对DD5单晶合金激光沉积CoCrW涂层的组织与性能的影响[J].表面技术,2025,54(9):164-174.
BIAN Hongyou,TAN Yukai,LIU Weijun,LI Qiang,WANG Wei.Effect of Inter-channel Cooling on Microstructure and Properties of CoCrW Coating Deposited by Laser on DD5 Single Crystal[J].Surface Technology,2025,54(9):164-174 |
| 道间冷却对DD5单晶合金激光沉积CoCrW涂层的组织与性能的影响 |
| Effect of Inter-channel Cooling on Microstructure and Properties of CoCrW Coating Deposited by Laser on DD5 Single Crystal |
| 投稿时间：2024-08-30 修订日期：2025-02-13 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.09.014 |
| 中文关键词: 激光技术 激光沉积 CoCrW 道间冷却 显微组织 力学性能 耐磨性 |
| 英文关键词:laser technology laser deposition CoCrW inter channel cooling microstructure mechanical properties wear resistance |
| 基金项目:国家重点研发计划(2022YFB4602202);沈阳市科学技术计划自然科学基金专项(目标导向类)(24-102-6-03) |
| 作者 | 单位 |
| 卞宏友 | 沈阳工业大学 机械工程学院，沈阳 110870 |
| 谭煜凯 | 沈阳工业大学 机械工程学院，沈阳 110870 |
| 刘伟军 | 沈阳工业大学 机械工程学院，沈阳 110870 |
| 李强 | 沈阳工业大学 机械工程学院，沈阳 110870 |
| 王蔚 | 沈阳工业大学 机械工程学院，沈阳 110870 |
|
| Author | Institution |
| BIAN Hongyou | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| TAN Yukai | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| LIU Weijun | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| LI Qiang | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| WANG Wei | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
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| 中文摘要: |
| 目的 DD5单晶合金涡轮叶片齿冠区域易发生磨损，通过激光沉积技术制备耐磨层，以提高其耐磨性能。基于激光沉积技术的工艺特点，其加工工艺会对成型后的耐磨层产生影响，探究冷却对激光沉积CoCrW耐磨层的影响对于增强耐磨层的力学性能具有重要意义。方法 采用激光沉积制造技术在DD5单晶合金表面制备道间无冷却和道间冷却的CoCrW耐磨层，分析耐磨层的表面温度、宏观形貌、显微组织、物相组成、显微硬度和磨损性能。结果 添加道间冷却60 s后，表面温度约为37 ℃，耐磨层高度整体下降，宏观形貌变得更为平整，耐磨层的枝晶组成未明显变化，但重熔区粗化晶粒区域面积明显下降，整体晶粒细化，CoCx、M7C3、M23C6碳化物强化相增多，冷却后的CoCrW耐磨层的平均硬度由477HV0.5提升至534HV0.5，硬度约提升了11.95%，摩擦因数由0.4降至0.35，磨损量由4.8 g降至4.0 g。结论 通过道间冷却，CoCrW耐磨层因连续激光沉积带来的热量累积量减少，重熔区的晶粒得到细化，从而提升了耐磨层的硬度和耐磨性能。 |
| 英文摘要: |
| DD5 alloy, a second-generation nickel-based single crystal superalloy independently developed by China, is renowned for its exceptional mechanical properties under high-temperature and high-pressure conditions. Therefore, it has not only been widely used in the production of single crystal turbine blades for aircraft engines, but also received extensive attention from scholars at home and abroad. But, the tooth crown area of DD5 single crystal alloy turbine blades is prone to wear, and a wear-resistant layer is prepared by laser deposition technology to enhance its wear resistance. However, the process characteristics of laser deposition technology, which melts and accumulates layer by layer, determine that the processing technology will have an impact on the formed wear-resistant layer. As a result, during the laser continuous deposition process, inter channel cooling is incorporated to decrease the heat buildup from the laser continuous deposition, and investigate its impact on the CoCrW wear-resistant layer produced through laser deposition. During the experiment, CoCrW metal powder is utilized for laser deposition, while DD5 single crystal alloy serves as the substrate. The cylindrical specimen has a diameter of 18 mm and a thickness of 4 mm. The mobility of the equipment is facilitated by the KUKA six axis robotic arm. Additionally, an IPG fiber laser with a wavelength of 1 070 nm and a maximum power of 6 000 W is employed for the laser processing. By employing laser deposition manufacturing technology, a wear-resistant CoCrW alloy layer is applied to the surface of DD5 single-crystal alloy. It aims to investigate the impact of inter-channel cooling on the structural characteristics of the laser deposition process, with consideration given to whether or not to implement the cooling method during deposition. A comparison of the distribution pattern of microhardness, friction and wear properties is made after analyzing the arborization of the deposited layer's microstructure, as well as extending the cooling time during the deposition process to change the deposition temperature. After cooling between the filling channels for 60 seconds to room temperature, the surface temperature is about 37 ℃, and the height of the wear-resistant layer decreases overall, making the macroscopic morphology smoother. The composition category of dendrites in the wear-resistant layer does not change significantly. The bottom primarily features columnar crystals, the middle is a mix of disordered columnar crystals and a few equiaxed crystals, while the top is predominantly made up of equiaxed crystals. After cooling, the inter layer remelting zone and the inter channel remelting zone of the CoCrW wear-resistant layer shows a marked decrease in coarsened grains, thus leading to an overall grain refinement of the layer with a more condensed arrangement. The strengthening phases of CoCx, M7C3, and M23C6 carbides increase. After cooling, the average hardness of the CoCrW wear-resistant layer increase from 477HV0.5 to 534HV0.5, with a hardness increase of 11.95%. The coefficient of friction plummets from 0.4 to 0.35, and the amount of wear drops from 4.8 g to 4.0 g. The CoCrW wear-resistant layer after inter channel cooling reduces the heat accumulation caused by continuous laser deposition, resulting in grain refinement in the remelted zone, thereby improving the hardness and wear resistance of the wear-resistant layer. |
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