Influence of laser polishing on surface roughness and microstructural properties of the remelted surface boundary layer of tool steel H11

Temmler, André; Liu, Dong E.; Preußner, Johannes; Oeser, Sabine; Luo, Jianbin; Poprawe, Reinhart; Schleifenbaum, Johannes Henrich

doi:10.1016/j.matdes.2020.108689

Cited by 66 publications

(44 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An explanation for this would be that the change in overlap is related to the ED and processing/interaction times. This simply means that for the same area of 1 cm 2 , and the same laser parameters (power, scanning speed), more energy is applied, in turn causing higher local heat accumulation on the surface to occur [ 28 ]. Moreover, with regards to the oxidation kinetics, the mass gain (linked to the oxidation level) increases with temperature, which naturally results in higher oxygen content readings.…”

Section: Resultsmentioning

confidence: 99%

“…However, it was shown that laser-induced oxidation may be a desirable effect in some applications [ 21 ]. Temmler et al noted that the utilizing of CO 2 for the LP of AISI H11 tool steel may reduce the formation of martensite, and also that a higher roughness reduction can be achieved when compared to an Ar atmosphere [ 28 ]. Temmler et al presented an extensive comparison of the influence of shielding gas on LµP.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Overlap on Surface Quality in the Laser Polishing of 3D Printed Inconel 718 under the Effect of Air and Argon

2021

View full text Add to dashboard Cite

Laser Polishing (LP) is a well-defined technology that has recently been applied to improve three-dimensional (3D) printed Inconel 718 (IN718) parts. However, the necessity to conduct the process in an argon chamber is one of its major drawbacks, which is associated with an increase in the costs of production and the limitations of the technology regarding the size of parts that can be polished. This article investigates the possibility to conduct LP of IN718 in an air atmosphere and compares the results with those from an argon chamber setup. The experiment was carried out in the context of the influence of overlap on the final surface. The improvement of surface quality was defined through the evaluation of average areal roughness parameters, material relocation, periodic surface components, and the categorization of process-induced structures. It was found that LP allows for the average roughness to be reduced by 82.8% and 87.9% for an air and argon atmosphere, respectively. The oxidation layer was characterized using Energy-Dispersive X-ray Spectroscopy (EDS) analysis. The formation of overlap with regards to Ti and Al oxides had a vital influence on surface quality.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Overlap on Surface Quality in the Laser Polishing of 3D Printed Inconel 718 under the Effect of Air and Argon

2021

View full text Add to dashboard Cite

show abstract

“…In recent years, laser polishing has been widely used to improve the surface quality for various metals [ 10 , 11 , 12 ]. Temmler et al [ 13 ] selected four sets of experimental process parameters to investigate the effect of multi-steps laser polishing on the microstructural properties of tool steel H11. They found that the surface roughness and the carbon concentration could be significantly reduced after laser polishing.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Zhou

Han

et al. 2021

Materials

View full text Add to dashboard Cite

Laser polishing is a widely used technology to improve the surface quality of the products. However, the investigation on the physical mechanism is still lacking. In this paper, the established numerical transient model reveals the rough surface evolution mechanism during laser polishing. Mass transfer driven by Marangoni force, surface tension and gravity appears in the laser-induced molten pool so that the polished surface topography tends to be smoother. The AlSi10Mg samples fabricated by laser-based powder bed fusion were polished at different laser hatching spaces, passes and directions to gain insight into the variation of the surface morphologies, roughness and microhardness in this paper. The experimental results show that after laser polishing, the surface roughness of Ra and Sa of the upper surface can be reduced from 12.5 μm to 3.7 μm and from to 29.3 μm to 8.4 μm, respectively, due to sufficient wetting in the molten pool. The microhardness of the upper surface can be elevated from 112.3 HV to 176.9 HV under the combined influence of the grain refinement, elements distribution change and surface defects elimination. Better surface quality can be gained by decreasing the hatching space, increasing polishing pass or choosing apposite laser direction.

show abstract

“…Another flexible post-processing technology for improving the quality of the 3D-manufactured parts consists of using laser surface treatments. Laser polishing has become a significant importance in the last 10 years and has several advantages against conventional polishing techniques [15][16][17][18]. For example, laser-based methods work without employing mechanical forces and deformations and make it possible to polish complex three-dimensional geometries or workpieces with thin materials [19].…”

Section: Introductionmentioning

confidence: 99%

Smoothing additive manufactured parts using ns-pulsed laser radiation

Kuisat

Lasagni

2021

Prog Addit Manuf

View full text Add to dashboard Cite

It is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

show abstract

Influence of laser polishing on surface roughness and microstructural properties of the remelted surface boundary layer of tool steel H11

Cited by 66 publications

References 78 publications

Influence of Overlap on Surface Quality in the Laser Polishing of 3D Printed Inconel 718 under the Effect of Air and Argon

Influence of Overlap on Surface Quality in the Laser Polishing of 3D Printed Inconel 718 under the Effect of Air and Argon

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Smoothing additive manufactured parts using ns-pulsed laser radiation

Contact Info

Product

Resources

About