The effect of SLM process parameters on density, hardness, tensile strength and surface quality of Ti-6Al-4V

Purpose For the laser powder bed fusion (L-PBF) technology, the side surface quality is essentially important for industrial applicated parts, such as the inner flow parts. Contour is generally adopted at the parts’ outline to enhance the side surface quality. However, the side surface roughness (Ra) is still larger than 10 microns even with contour in previous studies. The purpose of this paper is to study the influence of contour process parameters, laser power and scanning velocity on the side surface quality of the AlSi10Mg sample. Design/methodology/approach Using L-PBF technology to manufacture AlSi10Mg samples under different contour process parameters, use a laser confocal microscope to capture the surface information of the samples, and obtain the surface roughness Ra and the maximum surface height Rz of each sample after analysis and processing. Findings The results show that the side surface roughness decreases with the increase of the laser power at the fixed scanning velocity of 1,000 mm/s, the side surface roughness Ra stays within the error range as the contour velocity increases. It is found that the Ra increases with the scanning velocity increasing and the greater the laser power with the greater Ra increases when the laser power of contour process parameters is 300 W, 350 W and 400 W. The Rz maintain growth with the contour scanning velocity increasing at constant laser power. The continuous uniform contour covers the pores in the molten pool of the sample edge and thus increase the density of the sample. Two mechanisms named “Active adhesion” and “Passive adhesion” cause sticky powder. Originality/value Formation of a uniform and even contour track is key to obtain the good side surface quality. The side surface quality is determined by the uniformity and stability of the contour track when the layer thickness is fixed. These research results can provide helpful guidance to improve the surface quality of L-PBF manufactured parts.

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Ultraschallüberlagertes Trennschleifen von Faserverbundwerkstoffen*/Ultrasound abrasive cutting of fiber composites - Survey on the potential and mode of action

wt Werkstattstechnik online ◽

10.37544/1436-4980-2016-01-02-41 ◽

2016 ◽

Vol 106 (01-02) ◽

pp. 39-43

Author(s):

Y. Babenko ◽

T. Mayer ◽

A. Gebhardt

Keyword(s):

Surface Quality ◽

Process Parameters ◽

Mode Of Action ◽

Fiber Composites ◽

Cutting Process ◽

Force Analysis ◽

Abrasive Cutting

Dieser Fachartikel befasst sich mit der Untersuchung des Potentials der Ultraschallüberlagerung beim Trennschleifen moderner Faserverbundwerkstoffe. Es wurde eine Zerspankraftanalyse des Trennschleifprozesses am CFK-Werkstück mit variierenden Prozessparametern durchgeführt. Zudem wurden die Oberflächenqualitäten der Schnittkanten betrachtet.   The presented study describes the investigation of the potential of ultrasound abrasive cutting of modern fiber composites. A force analysis of the abrasive cutting process of CFRP was conducted, while the process parameters were varied. In addition, the surface quality of the machined workpieces was observed.

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ANALYSIS OF THE SURFACE QUALITY OF PARTS PROCESSED BY SINGLE POINT INCREMENTAL FORMING

Journal of Engineering Studies and Research ◽

10.29081/jesr.v19i3.119 ◽

2016 ◽

Vol 19 (3) ◽

Author(s):

CRINA RADU ◽

EUGEN HERGHELEGIU ◽

ION CRISTEA ◽

CAROL SCHNAKOVSZKY

Keyword(s):

Surface Quality ◽

Process Parameters ◽

Incremental Forming ◽

Single Point ◽

Single Point Incremental Forming ◽

Metal Sheets ◽

Vertical Step ◽

Tool Diameter ◽

Aluminium Metal

<p>The aim of the current work was to analyse the influence of the process parameters (tool diameter, size of the vertical step of tool, feed rate and spindle speed) on the quality of the processed surface, expressed in terms of roughness and macrostructure in the case of parts processed by single point incremental forming. The analysis was made on A1050 aluminium metal sheets. The obtained results revealed that the process parameters influence differently the surface quality, the worst influence being exerted by the increase of the vertical step of tool. </p>

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Effect of Atmosphere and Holding Time on the Quality of Surface and Mechanical Properties of the Cold-Rolling Plate of Fe-42% Ni (4J42)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.560-561.655 ◽

2012 ◽

Vol 560-561 ◽

pp. 655-660

Author(s):

Li Juan Li ◽

Li Hua Liu ◽

Jing Wang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Yield Strength ◽

Cold Rolling ◽

Surface Quality ◽

Annealing Process ◽

Holding Time ◽

Annealing Condition ◽

Nitrogen Ratio

In order to guide atmosphere annealing process in industry, the effect of atmosphere and holding times on the surface quality and mechanical properties of the cold-rolling plate of Fe-42% Ni (4J42) was studied. It is found that in the laboratory, surface qualities of all the samples annealed at different annealing condition are all good enough. When the ratio of hydrogen and nitrogen is below 70%:30%, at different holding time, with increasing of H2 proportion, 4J42’s tensile strength and yield strength all increases, and the hardness declines. And except H2:N2=70%:30, when holding time is less than or equal to 1.2min, at different ratio of hydrogen and nitrogen, holding time will influence 4J42’s mechanical properties little. So combine requires in industry with the experiment results, it can be concluded that for 4J42 alloy, annealing at atmosphere of hydrogen nitrogen ratio is less than 70%:30% for about 1.2min is appropriate to atmosphere annealing process in industry.

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Effect of process parameters on formability and surface quality of selective laser melted Al-Zn-Sc-Zr alloy from single track to block specimen

Optics & Laser Technology ◽

10.1016/j.optlastec.2019.05.008 ◽

2019 ◽

Vol 118 ◽

pp. 132-139 ◽

Cited By ~ 8

Author(s):

Jiang Bi ◽

Zhenglong Lei ◽

Yanbin Chen ◽

Xi Chen ◽

Xikun Qin ◽

...

Keyword(s):

Surface Quality ◽

Process Parameters ◽

Single Track ◽

Zr Alloy

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Effect of Process Parameters on the Surface Quality of Machined Aluminum and Steel Products

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/671/1/012151 ◽

2020 ◽

Vol 671 ◽

pp. 012151

Author(s):

Zaman W. Salman ◽

Adnan A. Ugla

Keyword(s):

Surface Quality ◽

Process Parameters

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Effect of press force in tensile strength and surface quality of press formed wood plastic composite products

10.1063/1.5112515 ◽

2019 ◽

Author(s):

Sami Matthews ◽

Amir Toghyani ◽

Panu Tanninen ◽

Marko Hyvärinen ◽

Ville Leminen ◽

...

Keyword(s):

Tensile Strength ◽

Surface Quality ◽

Wood Plastic Composite ◽

Plastic Composite

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The Influence of Process Parameters and Scanning Strategy on Lower Surface Quality of TA15 Parts Fabricated by Selective Laser Melting

Metals ◽

10.3390/met10091228 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1228

Author(s):

Junjie Jiang ◽

Jianming Chen ◽

Zhihao Ren ◽

Zhongfa Mao ◽

Xiangyu Ma ◽

...

Keyword(s):

Surface Quality ◽

Selective Laser Melting ◽

Process Parameters ◽

Flexible Manufacturing ◽

Molten Pool ◽

Lower Surface ◽

Laser Melting ◽

Scanning Strategy ◽

Influence Of Process Parameters

With superior flexible manufacturing capability, selective laser melting (SLM) has attracted more and more attention in the aerospace, medical, and automotive industries. However, the poor quality of the lower surface in overhanging structures is still one of the factors that limits the wide application of SLM. In this work, the influence of process parameters and scanning strategy on the lower surface quality of SLMed TA15 (Ti-6Al-2Zr-1Mo-1V) titanium alloy parts were studied. The results showed that the laser surface energy density (EF) had a significant influence on the quality of the lower surface. Excessive EF led to obvious sinking of the molten pool and a serious slag hanging phenomenon. However, the too low EF easily contributed to the insufficient powder fusion in the lower surface area, which led to the agglomeration of a molten pool during core processing, resulting in slag hanging, pores, and powder spalling that reduced the quality of the lower surface. Moreover, the cross-remelting strategy and non-remelting strategy gained better surface quality at the low EF and high EF, respectively. In addition, it was found that the quality of the lower surface could be quickly and accurately evaluated by the cooling time of the molten pool during the processing of the lower surface. This research can increase the understanding of the forming mechanism of the lower surface and has certain guiding significance for the process optimization of the lower surface.

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