Laser annealing of laser additive–manufactured Ni-Ti structures: An experimental–numerical investigation

Shiva, S.; Palani, I. A.; Paul, C.P.; Singh, Balwant

doi:10.1177/0954405416661582

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…As for other metal alloys, such as weathering steel, Ni-Ti structure, Inconel-718 alloy, Ni/Febased superalloy, and some other Al alloy have also been studied by some other researchers. [7][8][9][10] Olakanmi et al studied aluminum alloy powder. 11 The process parameters were changed to optimize the microstructure of the parts and different properties of the printed parts can be found in this work.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser rescanning on Ti6Al4V microstructure during selective laser melting

Duan

Han

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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TC4, which is one of the most widely used titanium alloy, is frequently used in biomedical field due to its biocompatible. In this work, selective laser melting (SLM) was used to manufacture TC4 parts and the printed parts were heat-treated using laser rescanning technology. The experimental results showed that laser rescanning had a high impact on the quality of SLMed part, and a different performance on wear resistance can be found on the basis. It can be seen that the volume porosity of the sample was 7.6 ± 0.5% without using any further processing technology. The volume porosity of the sample processed using laser rescanning strategy was decreased and the square-framed rescanning strategy had a relative optimal volume porosity (1.5 ± 0.3%) in all these five samples. With the further decreasing of volume porosity, the wear resistance decreased at the same time. As its excellent bio-tribological properties, the square-framed rescanning may be a potential suitable strategy to forming TC4 which used in human body.

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Section: Introductionmentioning

confidence: 99%

Effect of laser rescanning on Ti6Al4V microstructure during selective laser melting

Duan

Han

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Lasers can be applied in many machinings of materials such as laser heat treatments [1], drilling [2], cutting [3][4][5], welding [6][7][8], hardening process [9], polished surfaces [10], nanometer-scaled processing [11], etc. The nanometer-scaled processing was generally achieved by an ultrashort pulsed laser.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Direct Optical Ablation and Sequent Thermal Ablation for the Ultrashort Pulsed Laser Photo-Thermal Micromachining

Xiong

Qiao

2020

Coatings

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An ultra-fast pulsed laser for materials processing can obtain submicrometer- to nanometer-sized parts or patterns (precision or accuracy) because the heat cannot diffuse in time for an ultra-fast pulsed duration, and this causes a threshold of ablation in multi-photoabsorption. The optical and thermal effects significantly affect the processing quality of an ultrashort pulsed laser for materials. This study utilizes a Laplace transform method to display the optical and thermal effects on the temperature field and the ablated depth of an ultrashort pulsed laser processing of materials. The results reveal that If an ultrafast pulsed laser-induced heat can keep the irradiated region above the evaporated temperature until the thermal diffusion occurs in the lattice of materials, thermal ablation occurs. The optical ablation can get a better processing quality due to less thermal diffusion. This study theoretically elucidates that the depth of optical ablation approximates the product of an optical absorption length and the logarithm of the ratio of laser fluence to laser fluence threshold. It has also been shown that the optical and thermal ablation, respectively, occur in low and high laser fluence because the optical ablation depends directly on the main source of the incident ultrashort pulsed laser. However, the thermal ablation is determined by the residual heat directly from the incident ultrashort pulsed laser after the optical ablation. The increase rate of the ablated depth per pulse with laser fluence is actually lower at high laser fluences than that at low laser fluences because the thermal ablation using the residual heat directly from the incident ultrashort pulsed laser is governed at high laser fluences. This study will provide the closed-form of a solution that elucidate the direct optical ablation and sequent thermal ablation for the ultra-fast pulsed laser photo-thermal processing.

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“…In LAM-DED-based system, feedstock feeding mechanism is deployed and the feedstock is deposited by melting onto a melt pool generated by laser beam spot. 3,16,17 The first commercial form of LAM-DED is developed at Sandia National Laboratories using powder feed deposition. The process is first patented as the LENS process.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted directed energy deposition of nickel super alloys: A review

Jinoop

Paul

Bindra

2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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Laser additive manufacturing using directed energy deposition (LAM-DED) is an advanced manufacturing process widely deployed for fabricating near net-shaped engineering components. LAM-DED has been successfully used for processing wide variety of pure metals and their alloys. The list of these metals and alloys is appending rapidly. Among the various materials successfully deployed for LAM-DED, nickel super alloys are extensively used for various engineering applications due to the unique combination of superior properties, such as high temperature strength, oxidation, corrosion resistance, etc. Recent studies show that LAM-DED built nickel super alloys finds wide applications in aerospace and automotive sector for fabricating engineering components, repairing, remanufacturing, and cladding. Considering the importance of LAM-DED and nickel super alloys, significant amount of work is already reported. This paper presents a comprehensive review on LAM-DED of nickel super alloys. It introduces LAM technology and nickel super alloys with a compilation of various lasers and processing parameters deployed for LAM-DED of nickel super alloys. The paper compiles the metallurgy, mechanical properties, processing issues, and effect of post-processing on LAM-DED built nickel super alloys. This paper will serve as a quick-start for novices to understand LAM-DED of nickel super alloys and will be useful as a reference document for researchers and industrialists in the field.

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Laser annealing of laser additive–manufactured Ni-Ti structures: An experimental–numerical investigation

Cited by 11 publications

References 33 publications

Effect of laser rescanning on Ti6Al4V microstructure during selective laser melting

Effect of laser rescanning on Ti6Al4V microstructure during selective laser melting

Analysis of Direct Optical Ablation and Sequent Thermal Ablation for the Ultrashort Pulsed Laser Photo-Thermal Micromachining

Laser-assisted directed energy deposition of nickel super alloys: A review

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