scholarly journals A comparative study on surface topography and micro hardness of laser polished hardened AISI D2 tool steel

2021 ◽  
Author(s):  
Zuofa Liu ◽  
Jie Zhou ◽  
Hang Wang ◽  
Qiuyun Wang ◽  
Qiang Liang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
Surface Topography ◽  
Tool Steel ◽  
Laser Surface ◽  
Laser Surface Treatment ◽  
Laser Polishing ◽  
Aisi D2 ◽  
Aisi D2 Tool Steel ◽  
Polishing Efficiency

Abstract In this work, a laser polishing-hardening (LPH) method with integration and high efficiency for the treatment of AISI D2 tool steel was proposed, and the effects of laser hardening (LH), laser polishing (LP) and LPH treatments on the surface topography and microhardness were examined. The results show that LH method had a negligible effect on the surface roughness of the treated sample, while the surface roughness Ra of LP and LPH specimens was reduced by 74.6% and 80.9% respectively, indicating that the milled surface topography had been significantly improved, especially LPH was more effective in reducing the roughness. Besides, the polishing efficiency of LPH was 10 times that of LP approach. In terms of hardness improvement, the near-surface microhardness of LH and LPH samples increased by 1.5 times and 1.3 times respectively, and the effective hardened zone (EHZ) depth was 0.42 mm and 0.24 mm respectively, demonstrating that these two laser processing methods had a beneficial effect on the cross-section microhardness of D2 tool steel, while the increase of LP on the microhardness was insignificant. The comprehensive analysis of the surface morphology and microhardness of LPH specimen indicates that LPH was a feasible laser surface treatment method for D2 tool steel. On the premise of ensuring a high surface finish, the polishing efficiency can be remarkably improved, the subsurface microhardness and EHZ depth of processed specimen can be also significantly enhanced, which provided a feasible idea for the application of laser surface treatment technology in industrial mold production.

A Process Model for Laser Surface Treatment of Plasma Sprayed Coatings

2004 ◽  
Author(s):  
J. Wu ◽  
J. Choi ◽  
S. Zhang ◽  
G. Hilmas
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
Process Model ◽  
Laser Surface ◽  
Treatment Technique ◽  
Beam Diameter ◽  
Laser Surface Treatment ◽  
Coating Quality ◽  
Porosity Level ◽  
Plasma Sprayed

Advanced ceramics are not easily fabricated and consolidated by the plasma spray technique because of their extremely high melting temperature. Zirconium diboride (ZrB2) has been successfully plasma sprayed, but the coatings are quite porous. The high levels of porosity are usually a result of unmelted ZrB2 particles that have been incorporated into the coating during deposition. Applying a laser surface treatment to reduce both the porosity and the coating surface roughness, and to improve the coating quality, is of great interest. A laser based surface treatment technique provides a well-controlled heat input, with minimal or no distortion. In this study, a two dimensional mathematical model is developed to investigate the effects of laser power, beam diameter and level of porosity on the coating quality, incorporating melting, solidification, and evaporation phenomena. A continuum model is used to solve Navier-Stokes equations for both solid and liquid phases. Volume-of-Fluid (VOF) is incorporated to track the free surface. The surface force is incorporated as a body force instead of a boundary condition. The porosity level and surface roughness before and after the laser surface treatment are simulated and compared with experimental results.

Optimization of Machining Time and Surface Quality of AISI D2 Tool Steel in WEDM Using Taguchi Methodology and Desirability Analysis

2020 ◽  
Vol 977 ◽  
pp. 27-33
Author(s):  
Carmita Camposeco-Negrete ◽  
Juan de Dios Calderón-Nájera
Keyword(s):  
Surface Roughness ◽  
Tool Steel ◽  
Cutting Parameters ◽  
Machining Time ◽  
Aisi D2 ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Aisi D2 Tool Steel ◽  
Off Time

One of the non-conventional machining processes widely used in the industry is the wire electrical discharge machining (WEDM). This process has many advantages, like the great precision and quality that can be achieved. As well as other manufacturing operations, the success of the process relies on a correct selection of the cutting parameters. The present paper outlines an experimental study to optimize the machining time and the surface roughness in WEDM of AISI D2 tool steel during roughing machining. The Taguchi methodology is used to evaluate the effects and contributions of the pulse-on time, pulse-off time, servo voltage, and wire speed, on the response variables. The desirability method is employed to define a set of cutting parameters that allows reducing both machining time and surface roughness at the same time. The pulse-on time is the most significant factor for reducing the machining time, followed by the servo voltage, the pulse-off time and the wire speed. For surface roughness, the pulse-off time is the factor with the greatest influence over the response variable. The results obtained show that the machining time is reduced by 4.65%, and the surface roughness is diminished by 4.60% when compared with the initial values that are commonly used in the machining of AISI D2 tool steel. Therefore, greater production rates can be achieved without compromising the quality of the machined parts.

Laser surface treatment of H13 tool steel

1984 ◽  
Author(s):  
James T. Luxon ◽  
Charles V. White ◽  
Lynnea Zynda
Keyword(s):  
Surface Treatment ◽  
Tool Steel ◽  
Laser Surface ◽  
Laser Surface Treatment ◽  
H13 Tool Steel

scholarly journals Prediction of Surface Roughness in Hard Milling of AISI D2 Tool Steel

2007 ◽  
Vol 2007.4 (0) ◽  
pp. 7A108
Author(s):  
M.A. LAJIS ◽  
A.N. Mustafizul KARIM ◽  
A.K.M. Nurul AMIN ◽  
A.M.K. HAFIZ
Keyword(s):  
Surface Roughness ◽  
Tool Steel ◽  
Hard Milling ◽  
Aisi D2 ◽  
Aisi D2 Tool Steel

scholarly journals Laser Micro Polishing of Tool Steel 1.2379 (AISI D2): Influence of Intensity Distribution, Laser Beam Size, and Fluence on Surface Roughness and Area Rate

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1445
Author(s):  
André Temmler ◽  
Magdalena Cortina ◽  
Ingo Ross ◽  
Moritz E. Küpper ◽  
Silja-Katharina Rittinghaus
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Surface Topography ◽  
Tool Steel ◽  
Intensity Distribution ◽  
Basic Research ◽  
Industrial Applications ◽  
Fast Fourier Transformation ◽  
Surface Features ◽  
Aisi D2

Within the scope of this study, basic research was carried out on laser micro polishing of the tool steel 1.2379 (AISI D2) using a square, top-hat shaped intensity distribution. The influence of three different quadratic laser beam sizes (100 µm, 200 µm, 400 µm side length) and fluences up to 12 J/cm2 on the resulting surface topography and roughness were investigated. Surface topography was analyzed by microscopy, white light interferometry, spectral roughness analysis, and 1D fast Fourier transformation. Scanning electron microscopy and electrical discharge analyses indicate that chromium carbides are the source of undesired surface features such as craters and dimples, which were generated inherently to the remelting process. Particularly for high laser fluences, a noticeable stripe structure was observed, which is typically a characteristic of a continuous remelting process. Although the micro-roughness was significantly reduced, often, the macro-roughness was increased. The results show that smaller laser polishing fluences are required for larger laser beam dimensions. Additionally, the same or even a lower surface roughness and less undesired surface features were created for larger laser beam dimensions. This shows a potential path for industrial applications of laser micro polishing, where area rates of up to several m2/min might be achievable with commercially available laser beam sources.

Er,Cr:YSGG laser surface treatment of gamma titanium aluminide: Scanning electron microscopy–energy-dispersive X-ray spectrometer analysis, wettability and Eikenella corrodens and Aggregatibacter actinomycetemcomitans bacteria count—in vitro study

2020 ◽  
Vol 234 (8) ◽  
pp. 769-783
Author(s):  
Maryam Koopaie ◽  
Ali Kia Darbandsari ◽  
Neda Hakimiha ◽  
Sajad Kolahdooz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Roughness ◽  
Surface Treatment ◽  
Laser Surface ◽  
Energy Dispersive ◽  
Laser Surface Treatment ◽  
Eikenella Corrodens ◽  
X Ray ◽  
Scanning Electron

Dental implants play an important role in oral health. Titanium dental implants must endure the complex microflora environment of the oral cavity. Moreover, bacterial infections have been considered as one of the most important factors of implant failure. The issue of dental improvement through modification of chemical composition and surface treatment has received considerable critical attention. γ-TiAl as a novo biocompatible material revealed a slower corrosion rate in biological media rather Ti-6Al-4V. The objective of this study is to investigate the effect of Er,Cr:YSGG laser on γ-TiAl in comparison with sandblasted and acid-etched samples as the control groups and machined samples. Wettability, surface roughness, surface topography, scanning electron microscopy–energy dispersive X-ray spectrometer analysis of surface and subsurface of samples were investigated and bacteria counts of two periodontal bacterial strains ( Aggregatibacter actinomycetemcomitans and Eikenella corrodens) were evaluated on the Er,Cr:YSGG laser surface-treated sandblasted and acid-etched and machined samples. The results of this investigation show that Er,Cr:YSGG laser surface treatment affects surface roughness, surface topography, wettability, chemical composition of the surface and bacteria count. Scanning electron microscopy–energy dispersive X-ray spectrometer analysis of the sample revealed the increment of titanium and oxygen content and reduction of aluminum content in the surface and subsurface layer. A. actinomycetemcomitans and E. corrodens count were found from the lowest level to highest in the sandblasted and acid-etched samples, laser samples and machined samples, respectively. Using controlled parameters of Er,Cr:YSGG laser ensured no significant adverse alteration. The findings to emerge from this study revealed the significant correlation between microbial count and wettability. Furthermore, the contact angle strongly correlated with surface roughness.

The effect of laser surface melting on the retained austenite and wear properties of AISI D2 tool steel

Optik ◽  
2021 ◽  
pp. 168469
Author(s):  
Amir Moradiani ◽  
Zeinab Malekshahi Beiranvand ◽  
R.M. Chandima Ratnayake ◽  
Amir Aliabadi ◽  
Mehdi Rasoulinia
Keyword(s):  
Tool Steel ◽  
Retained Austenite ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Wear Properties ◽  
Aisi D2 ◽  
Aisi D2 Tool Steel

Analysis of Micro-Milling of Hardened Tool Steel

2016 ◽  
Vol 686 ◽  
pp. 57-62 ◽  
Author(s):  
Branislav Sredanovic ◽  
Gordana Globocki Lakic ◽  
Davorin Kramar ◽  
Janez Kopac
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Tool Steel ◽  
Micro Milling ◽  
Milling Cutter ◽  
Working Length ◽  
Aisi D2 ◽  
Hardened Tool Steel ◽  
Aisi D2 Tool Steel ◽  
Intensive Development

The development of industry in the last ten years has caused the production of parts with relatively small dimensions. This has led to intensive development of efficient micro-technologies through research of processes, machines and tools. This paper presents the research of machinability, channels micro-milling in AISI D2 tool steel (X155CrVMo-5), hardened to 62 HRc. As the tool is used micro-milling cutter with diameter of 0.6 mm and relatively large working length of 5 mm. Analysis of surface roughness, burr on workpiece edges and reduction of cutter diameter due tool wear was performed.

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