Chen Yan,Xu Huanhuan.Microstructure and properties of laser cladding composite coating on 42CrMo steel surface Jian Guangxiao1*, Wang Qinghua1, Yao Xiaojiang1, Ding Yuanhao1,[J].Plating & Finishing,2025,(02):30-37.
doi: 10.3969/j.issn.1001-3849.2025.02.00542CrMo钢表面激光熔覆复合涂层的显微组织与性能
- Title:
- Microstructure and properties of laser cladding composite coating on 42CrMo steel surface Jian Guangxiao1*, Wang Qinghua1, Yao Xiaojiang1, Ding Yuanhao1,
- Keywords:
- laser cladding; ultrasonic; microstructure; hardness; friction and wear
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 为了研究超声波对激光熔覆过程的影响，在确定最优激光工艺参数的基础上，运用超声波辅助技术，该技术通过在42CrMo钢基体表面应用，成功制备了镍基合金复合熔覆层。随后，借助SEM、XRD、EDS以及显微硬度仪等精密仪器对涂层的性能进行了全面的检测与分析。通过与无超声振动的激光熔覆层进行比对，分析了两种方式下的涂层在组织与力学性能方面的差异。从而得出：在对比研究超声振动对激光熔覆涂层性能的影响中，无论是否引入超声振动，涂层的物相组成均包括固溶体γ-Ni(Fe)，金属间化合物Ni3Fe，以及WC、Cr23C6、Fe7C3等；然而，超声振动显著细化了涂层晶粒，主要由树枝晶和细小枝晶组成，这一变化不仅提高了涂层的平均显微硬度至891.3 HV，相较于无超声振动涂层，提升了约27%；涂层的摩擦性能也得到了显著改善，摩擦因数降低至0.311，磨损量减少至9.17×10?3 mm 3，分别降低了约19%和25%。此外，涂层的磨损形式为轻微的磨粒磨损，进一步证实了超声振动对涂层性能的积极改善作用。
- Abstract:
- In order to study the influence of ultrasonic wave on laser cladding process, on the basis of determining the optimal laser process parameters, the ultrasonic assisted technology was applied on the 42CrMo steel matrix surface to successfully prepare the nickel-base alloy composite cladding layer. Then, the properties of the coating were tested and analyzed by SEM, XRD, EDS and microhardness tester. Compared with laser cladding without ultrasonic vibration, the differences in microstructure and mechanical properties of the two coatings were analyzed. The results show that in the comparative study of the effect of ultrasonic vibration on the properties of laser cladding coating, the phase composition of the coating includes solid solution γ-Ni(Fe), intermetallic compound Ni3Fe, WC, Cr23C6, Fe7C3, etc., regardless of whether ultrasonic vibration is introduced. However, ultrasonic vibration significantly refines the grain of the coating, which is mainly composed of dendrites and fine dendrites. This change not only increases the average microhardness of the coating to 891.3 HV, but also increases by about 27% compared with the coating without ultrasonic vibration. The friction performance of the coating was also significantly improved, with the friction factor reduced to 0.311 and the wear amount reduced to 9.17×10-3 mm 3, which were reduced by about 19% and 25%, respectively. In addition, the wear form of the coating is slight abrasive wear, which further confirms the positive effect of ultrasonic vibration on the coating performance
参考文献/References:
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