激光与光电子学进展, 2019, 56 (14): 141402, 网络出版: 2019-07-12   

超声振动对低搭接率激光熔覆层质量的影响 下载: 1048次

Effect of Ultrasonic Vibrations on Quality of Laser Cladding Layer with Low Overlap Rate
作者单位
新疆大学机械工程学院, 新疆 乌鲁木齐 830047
摘要
在施以超声振动的条件下进行熔覆实验的变搭接率实验,以弥补现有超声振动下激光熔覆实验搭接率选取较为单一的缺陷,并针对低搭接率的熔覆层进行进一步的性能探究。初始搭接率分别设定为33%,50%,66%,观察并比较33%低搭接率熔覆层与其他搭接率熔覆层的宏观样貌,随后在33%低搭接率下进一步进行不施加超声振动的对比实验。将对比实验样件用电火花切割后进行处理,观察2个切割试件的显微金相组织,并测评试件的硬度和耐磨性。结果表明,33%低搭接率下施加超声振动样件的熔覆道宏观样貌会出现波浪状条纹,而50%和66%搭接率下施加超声振动熔覆层宏观形貌平整无波纹。在33%低搭接率下对比添加超声振动与不添加超声振动试件的熔覆层质量,发现不施加超声振动的熔覆效果相对较好。该研究结果对超声振动下熔覆实验的搭接率选取具有一定参考意义。
Abstract
The variable overlap rate is investigated on the basis of ultrasonic vibrations in the cladding experiment to improve the current limitations in the overlap rate selection. Furthermore, the performance of cladding layer with a low overlap rate is investigated. The initial overlap rates are set to 33%, 50%, and 66%, and observations and comparisons of the macroscopic appearance between the 33% overlap rate and other overlap rates of the cladding layer are conducted. A comparative experiment that employs a 33% overlap rate of the cladding layer without ultrasonic vibration is also performed. The comparative samples are first processed via electrical discharge machining, followed by observations of their metallographic microstructures and evaluations of their hardness and wear resistance. The results show that the macroscopic appearance of the cladding layer of the sample with a 33% overlap rate exhibits wavy stripes, whereas no wavy stripes are observed at the other overlap rates. The good cladding effect is obtained using a 33% overlap rate, with the ultrasonic vibrations deteriorating the quality of laser cladding layer. This analysis outlines a useful approach for selecting the overlap rate when applying ultrasonic vibrations to laser cladding experiments.

王战, 孙文磊, 黄海博, 于江通, 刘金朵. 超声振动对低搭接率激光熔覆层质量的影响[J]. 激光与光电子学进展, 2019, 56(14): 141402. Zhan Wang, Wenlei Sun, Haibo Huang, Jiangtong Yu, Jinduo Liu. Effect of Ultrasonic Vibrations on Quality of Laser Cladding Layer with Low Overlap Rate[J]. Laser & Optoelectronics Progress, 2019, 56(14): 141402.

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