A novel selection method of scanning step for fabricating metal components based on micro-droplet deposition manufacture

Qi, Lehua; Chao, Yanpu; Luo, Jun; Zhou, Jiming; Hou, Xianghui; Li, Hejun

doi:10.1016/j.ijmachtools.2011.12.002

Cited by 58 publications

(15 citation statements)

References 20 publications

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“…In recent years, metal droplets have been used in many innovative technologies, such as the joining of electrical contacts [1][2][3], and 3D structuring [4]. Among various methods for metal droplet generation, which form a basis for the above technologies, laser droplet generation (LDG) from a wire [5,6] has been developed.…”

Section: Introductionmentioning

confidence: 99%

Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant droplet

Jeromen

Govekar

2016

Mechanical Systems and Signal Processing

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The subject of this study is the vertical mass-spring-like oscillation of a pendant droplet and its resonant detachment, which was experimentally observed in the process of laser droplet generation from a metal wire. The process was characterized by various time series, which were generated from a sequence of infrared intensity images of the process. Following a visual inspection of pendant droplet images and an analysis of a wavelet based time-frequency map of the droplet's vertical displacement time series, the pendant droplet's oscillation is described by a time-variable mass-spring system. Based on the characteristics of the timefrequency map, the resonant nature of the pendant droplet detachment was demonstrated. Additionally, an algebraic expression was formulated, which can be used to predict the detached droplet's diameter as a function of the laser pulse frequency.

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Section: Introductionmentioning

confidence: 99%

Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant droplet

Jeromen

Govekar

2016

Mechanical Systems and Signal Processing

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“…The quality of the formed parts is usually closely related to the additive manufacturing equipment, materials (powder material type, powder sphericity, powder fluidity, etc. ), and process (process parameters, scanning strategy) [32][33][34][110][111][112][113][114]. Various combinations of these parameters result in parts experiencing a unique and complex thermal history, which results in a mixture of microstructures during the fabrication.…”

Section: Introductionmentioning

confidence: 99%

Laser Powder Bed Fusion of Precipitation-Hardened Martensitic Stainless Steels: A Review

Zai

Zhang

Wang

et al. 2020

Metals

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Martensitic stainless steels are widely used in industries due to their high strength and good corrosion resistance performance. Precipitation-hardened (PH) martensitic stainless steels feature very high strength compared with other stainless steels, around 3-4 times the strength of austenitic stainless steels such as 304 and 316. However, the poor workability due to the high strength and hardness induced by precipitation hardening limits the extensive utilization of PH stainless steels as structural components of complex shapes. Laser powder bed fusion (L-PBF) is an attractive additive manufacturing technology, which not only exhibits the advantages of producing complex and precise parts with a short lead time, but also avoids or reduces the subsequent machining process. In this review, the microstructures of martensitic stainless steels in the as-built state, as well as the effects of process parameters, building atmosphere, and heat treatments on the microstructures, are reviewed. Then, the characteristics of defects in the as-built state and the causes are specifically analyzed. Afterward, the effect of process parameters and heat treatment conditions on mechanical properties are summarized and reviewed. Finally, the remaining issues and suggestions on future research on L-PBF of martensitic precipitation-hardened stainless steels are put forward.Metals 2020, 10, 255 2 of 25 types of microstructures can be obtained with different heat treatment processes [9]. The typical temperature range for aging heat treatment for this alloy is 480-620 • C [1]. Under the H900 condition (aging temperature: 482 • C, time: 1 h), the precipitation in 17-4 PH stainless steel begins with Cu-rich precipitates (bcc, body center cubic) that maintain a coherent relationship with the matrix, which would lead to an increase in tensile strength and toughness [4]. These precipitates can transform into non-coherent Cu-rich particles (fcc, face center cubic) after extended aging at 400 • C [5]. After experiencing over-aging, the precipitates are coarsened. The number of precipitates is reduced, and the coherence relationship is also destroyed [6,10]. These changes together lead to a decrease in mechanical strength, but an increase in ductility and impact toughness.PH stainless steels are widely used in the aerospace industry [11,12], the marine industry [13], nuclear reactor components [14], chemical process equipment [15], and medical apparatus due to their high tensile strength, impact strength, fracture toughness, and corrosion resistance at typical service temperatures below 300 • C [15,16]. Most of these parts are important load-bearing components of heavy machinery in a demanding service environment. However, PH stainless steels have poor workability and machinability due to their high strength and high hardness, which result in a long production cycle and difficulties in obtaining desired shapes through conventional machining and forming processes [17].Due to the high strength and high hardness of PH steels, they are difficult to b...

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“…Uniform molten metal droplets technique draws more and more attention due to its potential of fabricating rapidly metallic components [1][2][3]. In this technique, 3D object can be fabricated through a highly flexible "digital fabrication" process [4,5].…”

Section: Introductionmentioning

confidence: 99%

Direct fabrication of unsupported inclined aluminum pillars based on uniform micro droplets deposition

Zhang

Luo

et al. 2017

International Journal of Machine Tools and Manufacture

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A novel selection method of scanning step for fabricating metal components based on micro-droplet deposition manufacture

Cited by 58 publications

References 20 publications

Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant droplet

Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant droplet

Laser Powder Bed Fusion of Precipitation-Hardened Martensitic Stainless Steels: A Review

Direct fabrication of unsupported inclined aluminum pillars based on uniform micro droplets deposition

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