徐效文,卞宏友,刘伟军,邢飞,王蔚.DZ125合金表面激光熔化沉积Tribaloy T-800/WC复合涂层的显微组织和力学性能[J].表面技术,2024,53(21):162-175.
XU Xiaowen,BIAN Hongyou,LIU Weijun,XING Fei,WANG Wei.Microstructure and Properties of Tribaloy T-800/WC Composite Coating Deposited on DZ125 Directionally Solidified Superalloy by Laser Melting Deposition[J].Surface Technology,2024,53(21):162-175 |
| DZ125合金表面激光熔化沉积Tribaloy T-800/WC复合涂层的显微组织和力学性能 |
| Microstructure and Properties of Tribaloy T-800/WC Composite Coating Deposited on DZ125 Directionally Solidified Superalloy by Laser Melting Deposition |
| 投稿时间：2024-04-16 修订日期：2024-07-05 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.21.017 |
| 中文关键词: DZ125合金 T-800合金 复合涂层 显微组织 激光熔化沉积 |
| 英文关键词:DZ125 alloy T-800 alloy composite coating microstructure laser melting deposition |
| 基金项目:国家重点研发计划(2022YFB4602402) |
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| Author | Institution |
| XU Xiaowen | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| BIAN Hongyou | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| LIU Weijun | School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China |
| XING Fei | 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 提高锯齿冠的表面耐磨性能，延长涡轮叶片的使用寿命。方法 采用激光熔化沉积技术在DZ125合金表面制备T-800合金涂层和T-800/WC(5%)复合涂层，重点分析涂层的宏观形貌、物相组成、显微组织、硬度以及摩擦磨损性能。结果 T-800合金涂层和T-800/WC复合涂层内部均不存在裂纹。与T-800合金涂层相比，T-800/WC复合涂层的高度增加，稀释率降低。T-800合金涂层物相主要包括面心立方结构Co相和Laves相(Co3Mo2Si)，T-800/WC复合涂层中额外存在WC相、W2C相、Co6Mo6C相。T-800合金涂层和T-800/WC复合涂层的组织主要为平面晶、“花状”Laves相、粗大Laves相以及共晶组织。T-800合金涂层的平均显微硬度和摩擦因数分别为630HV0.5、0.42，WC的加入使得涂层性能得到提升，T-800/WC复合涂层的平均显微硬度和摩擦因数分别为697HV0.5、0.37。添加WC后，T-800合金涂层磨损机理由磨粒磨损、黏着磨损和氧化磨损转变为磨粒磨损、疲劳磨损和氧化磨损。结论 WC的添加促进了涂层晶粒细化和Laves相的析出，使得涂层的硬度和耐磨性得到提升。 |
| 英文摘要: |
| DZ125 directionally solidified superalloy has been widely used in the manufacture of components such as turbine blades for aircraft engines due to its excellent high temperature performance and superior thermal fatigue properties. However, as the DZ125 directionally solidified superalloy turbine blade is operated under high temperature and high pressure for a long period of time, friction and wear will lead to damage and failure of the serrated crown of the turbine blade, resulting in reduced the turbine blade life and reliability. Therefore, the application of surface modification technology to improve the surface wear resistance of the serrated crown is important to extend the service life of turbine blades. Under this engineering background, T-800 alloy coatings and T-800/WC composite coatings were deposited on the surface of DZ125 directionally solidified superalloy by laser cladding, and the macroscopic morphology, phase composition, microstructure, microhardness and the wear properties of the coatings were investigated. The powders selected for laser cladding on the surface of DZ125 directionally solidified superalloy were T-800 alloy powders and T-800/WC composite powders, and the content of WC was 5 wt.%. The substrate for the laser cladding experiment was the DZ125 directionally solidified superalloy with dimensions of 14 mm × 10 mm × 3 mm. The T-800 alloy coating and the T-800/WC composite coating were produced on the DZ125 directionally solidified superalloy through an LDM4030 synchronous laser powder deposition system. The experimental results showed that there were no cracks, pores and other defects in either the T-800 alloy coating or the T-800/WC composite coating. Both coatings formed a good bond to the substrate. The height of the T-800/WC composite coating increased and the dilution rate decreased compared with the T-800 alloy coating. The phases of the T-800 alloy coating were composed of the face-centred cubic Co phase and the Laves phase (Co3Mo2Si). After the addition of WC, additional WC phase, W2C phase and Co6Mo6C phase appeared in the T-800/WC composite coating. The microstructure of the T-800 alloy coating and the T-800/WC composite coating consisted mainly of planar crystal, "flower-like" Laves phase, coarse Laves phase and eutectic structure. Compared with the T-800 alloy coating, the T-800/WC composite coating showed a significant increase in the content of the Laves phase and a decrease in the content of the eutectic structure. The average microhardness and coefficient of friction of the T-800 alloy coating were 630HV0.5 and 0.42, respectively. And the addition of WC improved the coating performance. The average microhardness and coefficient of friction of the T-800/WC composite coating were 697HV0.5 and 0.37, respectively. With the addition of WC, the wear mechanism of the T-800 alloy coating was changed from abrasive wear, adhesive wear and oxidative wear to abrasive wear, fatigue wear and oxidative wear. It is concluded that the microhardness and wear resistance of T-800/WC composite coatings are higher than those of T-800 alloy coatings. The addition of WC promotes grain refinement and precipitation of the Laves phase (Co3Mo2Si) of the coating, resulting in improved microhardness and wear resistance of the coating. |
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