摘要
针对飞行器机构在运输、转载、挂飞等工况下的磨损失效问题,结合激光熔覆技术制备GH4169/WC复合涂层,开展激光熔覆工艺参数优化研究以及材料在运输振动工况下的常温干摩擦磨损行为和机理研究。基于田口-灰色关联理论,建立了GH4169/WC复合材料激光熔覆工艺参数优化方法,对激光熔覆工艺参数进行优化。以实际地面运输试验数据作为输入,开展飞行器机构动力学仿真与有限元分析,确定磨损试验中接触应力、滑动速度等试验参数。利用往复摩擦磨损试验机开展不同接触参数下的摩擦磨损试验,对比GH4169/WC复合涂层与单一GH4169材料的耐磨性能,分析磨损形貌和磨损量随接触应力与滑动速度的变化规律和机理。结合田口-灰色关联理论成功将多响应目标转化为单一灰色关联度,实现了激光熔覆工艺的优化。优化后的激光功率为650 W,扫描速度为2 mm/s,送粉速率为4.7 g/min。并且预测的灰色关联度(0.6697)与实验值(0.6729)吻合较好,误差仅为0.5%。同时,与单一GH4169镍基高温合金相比,GH4169/WC复合涂层磨损深度以及对磨副磨损量均得到了降低。田口-灰色关联法能够快速准确地实现复合材料激光熔覆工艺参数优化,有效提高熔覆层质量,为激光熔覆复合材料的工业应用提供了理论依据。同时,利用激光熔覆技术制备GH4169/WC复合涂层能够提高材料耐磨性能,改善飞行器在运输、转载、挂飞等工况下的磨损失效问题。
Wear-induced failure of GH4169 nickel-based superalloy components in aircraft transport,transfer,and suspendedflight operations constitutes a critical engineering challenge requiring urgent resolution.The advent of high-power lasers has facilitated the application of laser cladding technology in metal-ceramic composite coatings to enhance material wear resistance.However,limited research exists regarding laser cladding composite coatings,particularly concerning laser cladding parameters of composite coatings and the wear resistance characteristics and underlying mechanisms of composite coatings.Therefore,in the present study,GH4169/WC composite coating was deposited by laser cladding,and the process parameters were optimized by Taguchi-grey relational analysis.Furthermore,the dry slip wear behavior and its mechanism were systematically studied under vibration conditions simulating the operation of airborne equipment at ambient temperature.The main results demonstrate that the Taguchi-grey relation method effectively consolidates multi-response objectives into a singular grey relational grade(GRG),achieving the optimization of laser cladding process parameters.The optimized laser power,scanning speed and powder feeding rate are 650 W,2 mm/s,and 4.7 g/min,respectively.Notably,the predicted GRG(0.6697)exhibits excellent agreement with experimental results(0.6729),the prediction error is only 0.5%.Compared with GH4169 substrate,the composite coating reduces the wear depth by 38.2% and mass loss by 41.5%.In addition,with the increase in contact stress,the wear depth and wear amount of the material increases.And with the increase in sli-ding speed,the oxidation wear degree of the material gradually increases.The present study validated the efficacy of Taguchi-grey relation method in laser cladding optimization and elucidated the wear resistance mechanisms in metal-ceramic composite coatings,thereby providing theoretical foundations and experimental basis for enhancing the wear resistance of aerospace components.
作者
林婕
张海瑞
丁昊昊
姚鑫宇
姚重阳
王尧
LIN Jie;ZHANG Hairui;DING Haohao;YAO Xinyu;YAO Chongyang;WANG Yao(China Academy of Launch Vehicle Technology,Beijing 100076,China;State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China)
出处
《材料导报》
北大核心
2026年第4期107-116,共10页
Materials Reports
基金
中央高校基本科研业务费专项资金(2682024GF022)。
