液压千斤顶活塞杆用激光熔覆研究进展

发布时间：2018-01-25 18:39

本文关键词： 活塞杆激光熔覆腐蚀磨损疲劳熔覆效率　出处：《表面技术》2017年06期 　论文类型：期刊论文

【摘要】：综述了液压千斤顶活塞杆激光熔覆的研究进展,包括材料体系、耐蚀性能、耐磨性能、硬度、疲劳性能以及熔覆效率等方面。探讨了活塞杆常用熔覆层耐蚀性能的评价方法、性能参数及影响因素。各种试验结果表明,熔覆层的稀释和表面缺陷对耐蚀性能有不利影响,应通过工艺过程控制,同时完善检测手段;分析了液压千斤顶活塞杆的磨损机理及评价方法,重点探讨了常用材料在三体磨粒磨损与二体磨粒磨损工况下的耐磨性能,发现三体磨粒磨损和二体磨粒磨损对材料的硬度要求不同;考虑到第二相硬化导致耐蚀性能的降低,不应刻意通过第二相强化手段提高材料硬度而保证耐磨性能,应通过结构设计和维护保养避免磨粒磨损,在此前提下,保证熔覆层硬度在450HV左右是合适的。激光熔覆导致材料疲劳寿命的降低,主要原因在于残余拉应力和表面缺陷。鉴于加工硬化对熔覆层硬度和应力状态的影响,应进一步加强在疲劳寿命方面的研究,以进一步加快应用。为提高熔覆效率,在保证低稀释率的前提下,通过降低熔覆层的厚度,进而提高熔覆效率的方法是一种新的研究方向。
[Abstract]:The research progress of laser cladding of hydraulic Jack piston rod is reviewed, including material system, corrosion resistance, wear resistance and hardness. The evaluation methods, performance parameters and influencing factors of the corrosion resistance of the common cladding layer of piston rod are discussed. The results of various tests show that the corrosion resistance of the cladding layer is affected by the fatigue performance and cladding efficiency. The dilution and surface defects of the cladding coating have adverse effects on the corrosion resistance, which should be controlled by the process and the testing means should be improved. The wear mechanism and evaluation method of hydraulic Jack piston rod are analyzed, and the wear resistance of common materials under the condition of three-body abrasive wear and two-body abrasive wear is discussed. It is found that the hardness of the material is different from the wear of three-body abrasive and two-body abrasive. Considering that the second phase hardening results in the decrease of the corrosion resistance, the wear resistance should not be improved by the second phase hardening method, but the abrasive wear should be avoided through the structure design and maintenance. It is suitable to ensure the hardness of the cladding layer is about 450 HV. Laser cladding can reduce the fatigue life of the material. The main causes are residual tensile stress and surface defects. In view of the effect of work hardening on the hardness and stress state of the cladding, the study on fatigue life should be further strengthened. In order to improve the cladding efficiency, it is a new research direction to improve the cladding efficiency by reducing the thickness of cladding and increasing the cladding efficiency under the premise of low dilution rate.
【作者单位】：郑州煤矿机械集团股份有限公司;
【分类号】：TG174.4;TH211.1
【正文快照】： Received:2017-01-20;Revised:2017-03-20液压千斤顶(图1)广泛应用于工程机械、水利工程、海洋钻井平台、煤矿开采等领域[1—4],由于活塞杆长期暴露于大气、海水、矿井等腐蚀环境,表面易发生腐蚀,需对其进行表面处理以提高其耐蚀性能。传统的表面处理技术主要有电镀、热喷涂(

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