scholarly journals Influence of the Main Parameters of Selective Laser Melting on Stability of Single Track Formation when ‘Growing’ Parts from Copper Alloys

2019 ◽  
pp. 20-29 ◽  
Author(s):  
A.G. Grigoriyants ◽  
D.S. Kolchanov ◽  
A.A. Drenin ◽  
A.O. Denezhkin
Keyword(s):  
Selective Laser Melting ◽  
Copper Alloys ◽  
Melting Process ◽  
Scanning Speed ◽  
Single Track ◽  
Optimal Parameters ◽  
Laser Melting ◽  
Track Formation ◽  
The Stability ◽  
Lower Limits

Selective laser melting technology has the ability to directly produce finished parts, and is economically efficient for single or small batch production. Copper and its alloys are of great interest due to their high thermal and electrical conductivity. The influence of build process parameters, such as scanning speed and layer thickness on the stability of single track formation using a heat-resistant copper alloy PR-BrKh was investigated in this paper. The mechanism of single track formation was studied. As a result, patterns of formation of a stable single track were established, the upper and lower limits of the build parameters were determined. The results of the study provide a deeper understanding of the copper alloys selective laser melting process and may serve as a basis for determining the optimal parameters’ range for ‘growing’ solid structures.

Track evolution and surface characteristics of selective laser melting Ti6Al4V

2018 ◽  
Vol 24 (9) ◽  
pp. 1554-1562 ◽  
Author(s):  
Luo Zhang ◽  
Haihong Zhu ◽  
Jiahe Liu ◽  
Xiaoyan Zeng
Keyword(s):  
Surface Morphology ◽  
Selective Laser Melting ◽  
Surface Characteristics ◽  
Scanning Speed ◽  
Bulk Sample ◽  
Three Dimension ◽  
Single Track ◽  
Heat Accumulation ◽  
Laser Melting ◽  
Content Type

Purpose The purpose of this paper is to investigate the track evolution and surface characteristics of selective laser melting Ti6Al4V. Design/methodology/approach In the present paper, Ti6Al4V single-track, multi-track and bulk sample were formed at different scanning speed by selective laser melting (SLM). Then, the surface morphology, three-dimension profile and surface roughness were evaluated. The width of the single and multi-track was measured and compared. Findings The results showed that the heat accumulation played a great role on the evolution of tracks and surface characteristics from single-track to multi-track and to bulk. The surface morphology of the subsequent tracks became more regular when the single-track was irregular at the same high scanning speed. The width of last track Wn was always larger than that of the first track W1. The Ra of the top of the bulk increased with the increase of the scanning speed, this trend was as same as the Ra of the single-track, but the trend of Ra of the side was opposite. Originality/value The effect of heat accumulation on the track evolution and surface characteristics is obtained. The results can help to derive a smooth surface with a regular and continuous track in SLM.

Single Track Formation during Selective Laser Melting of Ti-6Al-4V Alloy

2019 ◽  
Vol 946 ◽  
pp. 978-983 ◽  
Author(s):  
R.M. Baitimerov
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Complex Shape ◽  
Powder Layer ◽  
Single Track ◽  
Laser Melting ◽  
Additive Manufacturing Technology ◽  
Geometrical Characteristics ◽  
Track Formation ◽  
Point Distance

Selective laser melting (SLM) is an additive manufacturing technology that allows to produce functional parts with extremely complex shape from metal powder feedstock. 240 single tracks with the length of 10 mm were fabricated using different SLM process parameters: laser power output, powder layer thickness, point distance and exposure time. Obtained single tracks were measured using optical microscopy. An influence of SLM process parameters on geometrical characteristics of obtained single tracks was investigated.

Effect of scanning speed on the solidification process of Al2O3/GdAlO3/ZrO2 eutectic ceramics in a single track by selective laser melting

2019 ◽  
Vol 45 (14) ◽  
pp. 17252-17257
Author(s):  
Haifang Liu ◽  
Haijun Su ◽  
Zhonglin Shen ◽  
Di Zhao ◽  
Yuan Liu ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Solidification Process ◽  
Scanning Speed ◽  
Single Track ◽  
Laser Melting

scholarly journals Effects of the powder morphology, size distribution, and characteristics on the single track formation in selective laser melting of H13 steel

2021 ◽  
Vol 15 (3) ◽  
pp. JAMDSM0035-JAMDSM0035
Author(s):  
Mitsugu YAMAGUCHI ◽  
Tatsuaki FURUMOTO ◽  
Yuuya TANABE ◽  
Shinnosuke YAMADA ◽  
Mototsugu OSAKI ◽  
...  
Keyword(s):  
Size Distribution ◽  
Selective Laser Melting ◽  
Single Track ◽  
Laser Melting ◽  
H13 Steel ◽  
Powder Morphology ◽  
Track Formation

Numerical Study of Porosity Formation With Implementation of Laser Multiple Reflection in Selective Laser Melting

2019 ◽  
Author(s):  
Bo Cheng ◽  
Charles Tuffile
Keyword(s):  
Selective Laser Melting ◽  
Laser Scanning ◽  
Numerical Study ◽  
Fluid Model ◽  
Melting Process ◽  
Scanning Speed ◽  
Powder Layer ◽  
Cfd Model ◽  
Laser Melting ◽  
Porosity Formation

Abstract In selective laser melting (SLM) process, the build part quality is determined by process parameters such as laser scanning speed and power. The presence of porosity, a major printing defect that significantly affects part performance, may arise in laser melting process due to insufficient or excess energy input. The improvement of build quality heavily depends on fundamental understanding of porosity formation in the SLM process. In this study, the discrete element method (DEM) has been utilized to simulate the creation of a newly deposited powder layer. A computational fluid dynamics (CFD) model was developed to simulate the melting and solidification process of Ti-6Al-4V powders in the SLM process. The thermo-fluid model includes effect of surface tension and recoil pressure as well as laser ray multi-reflection in keyhole. The predictability of the developed CFD model has been validated against literature experimental data. It is found that the collapse of an unstable deep keyhole was responsible for the formation of pores. In addition, higher laser scanning speeds tend to form unstable melt pools, e.g., melt pool break-up.

A Study of Keyhole Porosity in Selective Laser Melting: Single-Track Scanning With Micro-CT Analysis

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Subin Shrestha ◽  
Thomas Starr ◽  
Kevin Chou
Keyword(s):  
Selective Laser Melting ◽  
Laser Power ◽  
Scanning Speed ◽  
Single Track ◽  
Micro Computed Tomography ◽  
Laser Melting ◽  
Pore Characteristics ◽  
Line Energy ◽  
The Individual ◽  
Pore Number

Porosity is an inherent attribute in selective laser melting (SLM) and profoundly degrades the build part quality and its performance. This study attempts to understand and characterize the keyhole pores formed during single-track scanning in SLM. First, 24 single tracks were generated using different line energy density (LED) levels, ranging from 0.1 J/mm to 0.98 J/mm, by varying the laser power and the scanning speed. The samples were then scanned by micro-computed tomography to measure keyhole pores and analyze the pore characteristics. The results show a general trend that the severity of the keyhole porosity increases with the increase of the LED with exceptions of certain patterns, implying important individual contributions from the parameters. Next, by keeping the LED constant in another set of experiments, different combinations of the power and the speed were tested to investigate the individual effect. Based on the results obtained, the laser power appears to have a greater effect than the scanning speed on both the pore number and the pore volume as well as the pore depth. For the same LED, the pore number and volume increase with increasing laser power until a certain critical level, beyond which, both the pore number and volume will decrease, if the power is further increased. For the LED of 0.32 J/mm, 0.4 J/mm, and 0.48 J/mm, the critical laser power that reverses the trend is about 132 W, 140 W, and 144 W, respectively.

Experimental Investigation into the Single-Track of Selective Laser Melting of IN625

2011 ◽  
Vol 233-235 ◽  
pp. 2844-2848 ◽  
Author(s):  
Li Wang ◽  
Qing Song Wei ◽  
Yu Sheng Shi ◽  
Jin Hui Liu ◽  
Wen Ting He
Keyword(s):  
Energy Density ◽  
Relative Density ◽  
Surface Quality ◽  
Selective Laser Melting ◽  
Laser Power ◽  
Laser Energy ◽  
Scanning Speed ◽  
Single Track ◽  
Laser Melting ◽  
Metallic Parts

Selective laser melting(SLM) is driven by the need to fabricate functional metallic parts and tools with near shape and density. The method of process to fabricate a metal part will save materials, time and energy compared to the traditional manufacturing methods. Unlike the selective laser sintering (SLS), the metal powder particles are molten by the laser beam during the process of selective laser melting. In this paper, IN625 powders were adopted to investigate the characters of single molten track. The factors that affect the surface quality and relative density are the process parameters such as the laser energy, scan speed and so on. They were studied to find out the correlation between the parameters and formation of single-track. It has been found that Optimal ratio between laser power and scanning speed (P/v) is 1-1.5 for IN625 SLM. P/v is the linear energy density. It also has been found that the width and height of single-track can be calculated when the linear energy density is given. In this study the laser power, scan spacing and the hatch spacing which affect the surface quality and the relative density of the metallic parts were optimized.

scholarly journals Impact of aluminum powder parts growth by method of selective laser melting upon porosity, micro-hardness and micro-structure

2020 ◽  
Vol 2020 (10) ◽  
pp. 40-48
Author(s):  
Dmitriy Kolchanov ◽  
Aleksandr Perestoronin ◽  
Ivan Binkov ◽  
Daniil Povalyuhin ◽  
Artem Smirnov
Keyword(s):  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Aluminum Powder ◽  
Melting Process ◽  
Practical Significance ◽  
Micro Hardness ◽  
Micro Structure ◽  
Laser Melting ◽  
Selective Laser Melting Process ◽  
Track Formation

In the paper there are shown the investigation results of the mode range of selective laser melting process in the course of which is achieved minimum porosity in samples grown from aluminum powder. The estimate of hardness in different areas of samples is carried out, a single melted track formation is considered. The results have practical significance for the growth aluminum alloy products with the specified structure.

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