Dynamic evolution of keyhole during multi-pulse drilling with a millisecond laser on 304 stainless steel

doi:10.1016/j.optlastec.2022.108151

IMECH-IR > 宽域飞行工程科学与应用中心

	Dynamic evolution of keyhole during multi-pulse drilling with a millisecond laser on 304 stainless steel
	Zhang Y(张越)1,3 ; He XL(何秀丽)1,3 ; Yu G(虞钢)1,2,3 ; Li SX(李少霞)1,3 ; Tian CX(田崇鑫)1,3 ; Ning WJ(宁伟健)1 ; Zhang YM(张艳梅)1,3
通讯作者	He, Xiuli(xlhe@imech.ac.cn) ; Yu, Gang(gyu@imech.ac.cn)
发表期刊	OPTICS AND LASER TECHNOLOGY
	2022-08-01
卷号	152 页码:12
ISSN	0030-3992
摘要	The efficiency of millisecond laser drilling is high due to the molten material ejection, and is applied in many industries like aerospace, automobile and electronics. However, there may be some defects such as hole blockage, low machining accuracy and low repeatability, especially for the process of multi-pulse drilling. The melt flow remaining inside keyhole due to inefficient ejection, is responsible for the formation of those defects. Hence, it is necessary to investigate the dynamic behavior of melt flow during multi-pulse drilling. In this paper, the dynamic evolution of keyhole is investigated combining in-situ observation and numerical simulation methods. According to the ejection efficiency, the multi-pulse drilling process can be divided into three periods, namely rapid drilling period, linear drilling period, and moderate drilling period. The melt flow behaves differently in each period. In rapid drilling period, a conical keyhole is formed in the end. The melt flow behavior is affected dominantly by the recoil pressure when the laser is on and by the surface tension when the laser is off. In linear drilling period, the blocked keyhole occurs occasionally. The melt flow behavior is affected by gravity and recoil pressure when the laser is on and by the surface tension and recoil pressure when the laser is off. In moderate drilling period, the keyhole profile is wavy. The melt flow behavior is affected by surface tension and recoil pressure dominantly during the whole period. The melt flow transition and its influence factors are investigated in this paper, which is helpful for understanding the physical processes during the multi-pulse laser irradiation process.
关键词	Laser drilling Keyhole evolution Driving forces Flow pattern Numerical simulation
DOI	10.1016/j.optlastec.2022.108151
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000794981500006
关键词[WOS]	FORMATION MECHANISM ; DENSITY ; SPEED
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Applied
论文分区	二类/Q1
力学所作者排名	1
RpAuthor	He, Xiuli ; Yu, Gang
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/89394
专题	宽域飞行工程科学与应用中心
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang Y,He XL,Yu G,et al. Dynamic evolution of keyhole during multi-pulse drilling with a millisecond laser on 304 stainless steel[J]. OPTICS AND LASER TECHNOLOGY,2022,152:12.
APA	张越.,何秀丽.,虞钢.,李少霞.,田崇鑫.,...&张艳梅.(2022).Dynamic evolution of keyhole during multi-pulse drilling with a millisecond laser on 304 stainless steel.OPTICS AND LASER TECHNOLOGY,152,12.
MLA	张越,et al."Dynamic evolution of keyhole during multi-pulse drilling with a millisecond laser on 304 stainless steel".OPTICS AND LASER TECHNOLOGY 152(2022):12.

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