Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Duan, Weipeng; Wu, Meiping; Han, Jitai; Ma, Yiqing; Lu, Pingping; Miao, Xiaojin

doi:10.1177/09544089211059058

Cited by 2 publications

(3 citation statements)

References 46 publications

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“…In addition, some studies show that the sharpness of XRD peaks is positively correlated with the grain size of samples. [24][25][26] As shown, with the increase of laser power, the peaks in the XRD pattern become increasingly sharp, which also confirms the change process of grain size from fine to coarse. It can be seen that the change in laser power affects the grain size.…”

Section: Xrd Analysissupporting

confidence: 62%

“…The lower substrate was a non-machining area which is divided by 0.05 mm free mesh with a tetrahedral shape. During this simulation, the initial condition is defined as follows 24,25 :…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…During this simulation, the initial condition is defined as follows 24,25 : where T 0 is the initial temperature, 298 K.…”

Section: Materials and Experimental Processmentioning

confidence: 99%

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Effect of laser power on the forming quality of Al6061 alloy manufactured via selective laser melting

Duan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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A systematic work was studied to illustrate the influence of laser power on the forming quality of Al6061 alloy by selective laser melting (SLM). The relationship between laser power and molten pool was simulated by finite element analysis (FEA). Phase composition, defects, and microhardness were also measured and analyzed. The results show that, with the increase of laser power, the molten pool gradually changes from rectangular shape to droplet shape. And the cooling rate gradually increases from 3.282 × 104°C/s to 5.189 × 104°C/s. Higher laser power (400 W) is accompanied by higher molten pool maximum temperature (2012.73°C). This may lead to larger temperature gradient inside the sample causing evaporation and spatter of powder. On the contrary, lower laser power leads to unmelt of some powders, which increases the number of pore defects and influences the forming quality of samples. X-ray diffractogram (XRD) displays the Al6061 alloy characterized by the obvious preferred orientation under different laser powers and the grain size increased from 32.57 nm to 35.38 nm. With the increase of laser power, the number of defects, especially holes and microcracks, was first decreased and then increased. However, the microhardness of the sample decreased almost linearly from 98.6 HV0.05 to 88.86 HV0.05. All changes are the result of the comprehensive action of laser power and molten pool state. Besides, the action mechanism of laser power on the forming quality was also clarified in this work.

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Section: Xrd Analysissupporting

confidence: 62%

“…The lower substrate was a non-machining area which is divided by 0.05 mm free mesh with a tetrahedral shape. During this simulation, the initial condition is defined as follows 24,25 :…”

Section: Finite Element Simulationmentioning

confidence: 99%

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Effect of laser power on the forming quality of Al6061 alloy manufactured via selective laser melting

Duan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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A short review on SLM-processed Ti6Al4V composites

Kathiresan

Karthikeyan

Immanuel

2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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The advancements in computer-aided design, manufacturing, and additive manufacturing techniques attracted the researcher to apply various new methods with the unique combination of alloys and composites to design and develop complex parts. Among them the selective laser melting (SLM) process, a branch of additive manufacturing, and Ti6Al4V (Ti64) composite. Due to the better mechanical and corrosion resistance characteristics of Ti64 and its composites, they have been utilized for making various engineering parts related to jet engine fans of aero-engine, engine valves of automobiles, knee and hip joint endoprosthesis in the biomedical field, and corrosion resistance pipes in chemical industries. Also, more complex, net-shaped, and lattice-structured components can be fabricated by advancing the SLM process. The final quality of the parts manufactured from the SLM technique will depend on the fabrication process parameters followed. Many researchers have done research work on metal additive manufacturing by changing and optimizing the SLM process parameters such as laser power ( P), scanning speed ( v), hatch spacing ( d), and layer thickness ( h). Also, they have studied the effect of changes on the feedstock preparation, SLM process parameters, milling time of composite and post-heat treatment on the quality of Ti6Al4V composites. Therefore, a detailed review is needed to study the effect of the abovementioned parameters on the quality of metal additively manufactured parts through SLM. Hence, a short review is done on future challenges and opportunities of SLM-processed Ti6Al4V composites and reported in this article.

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Effect of defocusing distance on the forming quality of inner structure parts manufactured via selective laser melting

Cited by 2 publications

References 46 publications

Effect of laser power on the forming quality of Al6061 alloy manufactured via selective laser melting

Effect of laser power on the forming quality of Al6061 alloy manufactured via selective laser melting

A short review on SLM-processed Ti6Al4V composites

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