Dynamic Detection and Analysis of Fore-Put Powder Melting Behavior in Diode Laser Cladding Process

doi:10.3788/CJL202148.1402013

	Dynamic Detection and Analysis of Fore-Put Powder Melting Behavior in Diode Laser Cladding Process
	Zhu, Ming 1,2; Wang, Bo 1; Yan, Buyun 1; Yang, Qian 1; Shi, Yu 1,2; Fan, Ding 1,2
刊名	Zhongguo Jiguang/Chinese Journal of Lasers
	2021-07-25
卷号	48 期号:14
关键词	Cladding (coating) Coatings Diodes Drops Dynamics Heat affected zone Heat transfer High speed cameras Irradiation Laser cladding Liquid metals Metal analysis Metal melting Metals Morphology Particle size analysis Pelletizing Polymer blends Powder metals Semiconductor lasers Specific heat Substrates Surface defects Wetting Energy balance equations Heat balance equations Heat transfer process Laser cladding technology Laser-cladding process Physical characteristics Stringent requirement Thermophysical process
ISSN号	02587025
DOI	10.3788/CJL202148.1402013
英文摘要	Objective: Laser cladding technology is widely used in coating deposition, worn surface repairing, and direct fabrication due to advantages, such as high deposition accuracy, small heat-affected zone, metallurgical bonding, and minimal dilution with the substrate. It is a surface modification technology for thin coating/layer fabrication with improved surface properties or surface defect refurbishment by forming highly resistant gradient coatings/layers on a substrate. Recently, the innovations in diode laser cladding significantly support remanufacture, and more stringent requirements have been put forward on the forming accuracy and quality. There is inadequate research on forming mechanisms in the diode laser cladding process; just depending on numerous process tests or human experience cannot effectively improve accuracy or control quality under unfavorable conditions, such as heat accumulation and stress concentration. To improve the laser cladding technology level, the development of on-line and high-speed monitoring and process controlling system is necessary. In particular, studies on powder melting behavior play a paramount role in forming mechanisms. Therefore, for fore-put powders, the characteristic behavior of the melting process was detected, and the investigation of the thermal physical characteristics was analyzed. Then, the equations of heat balance to describe the melting process were established. Finally, a model to analyze the thermal physical process in diode laser cladding process was set up. Methods: To analyze the interaction process between the diode laser and fore-put powders, first, an optical acquisition system with a high-speed camera was set up to observe the powder melting process; second, based on the analysis of the collected high-speed camera data, the characteristic behavior of the cladding process was analyzed; and finally, according to the analysis of the powder melting process, the models of thermophysical processes in different characteristic stages were set up, and the heat-balance equation for each characteristic stage was established. Results and Discussions: There are typical physical phenomena in the powder melting process, starting from the laser irradiation of the powder layer to the formation of the cladding layer (Fig. 4). The cladding process can be divided into four stages according to the existing physical phenomena (Fig. 5). 1) Initial stage: under the laser heat source radiation, the powder particles adhere to each other and gather to form particle agglomerates. 2) Melting stage one: the powder particles are melted to form liquid metal pellets with sizes of 1.271.90 mm. 3) Melting stage two: the liquid metal pellets agglomerate to form a larger liquid metal ball with a diameter of 3.807.25 mm, surrounded by a few liquid metal pellets with diameters of © 2021, Chinese Lasers Press. All right reserved.
语种	中文
出版者	Science Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150759]
专题	材料科学与工程学院图书馆
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhu, Ming,Wang, Bo,Yan, Buyun,et al. Dynamic Detection and Analysis of Fore-Put Powder Melting Behavior in Diode Laser Cladding Process[J]. Zhongguo Jiguang/Chinese Journal of Lasers,2021,48(14).
APA	Zhu, Ming,Wang, Bo,Yan, Buyun,Yang, Qian,Shi, Yu,&Fan, Ding.(2021).Dynamic Detection and Analysis of Fore-Put Powder Melting Behavior in Diode Laser Cladding Process.Zhongguo Jiguang/Chinese Journal of Lasers,48(14).
MLA	Zhu, Ming,et al."Dynamic Detection and Analysis of Fore-Put Powder Melting Behavior in Diode Laser Cladding Process".Zhongguo Jiguang/Chinese Journal of Lasers 48.14(2021).