scholarly journals Influence of Laser Surface Texturing Sequence on Fatigue Properties of Coated Cold Work Tool Steel

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1636
Author(s):  
Marko Sedlaček ◽  
Agnieszka Zuzanna Guštin ◽  
Borut Žužek
Keyword(s):  
Fatigue Life ◽  
Tool Steel ◽  
Cold Work ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Fatigue Properties ◽  
Laser Texturing ◽  
Coating Deposition ◽  
Cold Work Tool Steel

The aim of this research was to investigate the influence of laser surface texturing sequence on the fatigue properties of cold-work tool steel. For this reason, polished hourglass-type test specimens made from cold-work tool steel (K890) were surface textured using laser texturing. Surface textures were introduced before and after hard coating deposition (TiAlN) with the aim to investigate the sequence of surface-texturing process. It was found that coating deposition prolongs the fatigue life. The fatigue life behaviour can be influenced also by the sequence of surface texturing. In the case when laser texturing is done after coating deposition, it suffers in fatigue life properties. From a lower magnification, a fractured surface looks like a quasi-ductile fracture, but a closer look reveals that there is very little plastic deformation and some small flat regions can be seen with clear evidence of a brittle fracture mechanism with cleavage. Due to low fracture toughness of investigated steel, no fatigue striations of crack growth steps were found on the fractured surfaces.

Influence of Surface Texturing Sequence on Fatigue Life and Tribological Properties of Coated Tool Steel

2018 ◽  
Vol 767 ◽  
pp. 85-92 ◽  
Author(s):  
Marko Sedlaček ◽  
Bojan Podgornik ◽  
Damir Česnik
Keyword(s):  
Fatigue Life ◽  
Tool Steel ◽  
Tribological Properties ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Tialn Coating ◽  
Coating Deposition ◽  
Coated Tool ◽  
Before And After

The aim of this study was to investigate the influence of laser surface texturing on fatigue life and tribological properties. Textures were introduced before and after hard TiAlN coating deposition in order to investigate the sequence of surface texturing process. It was found that the sequence of surface texturing has an effect on tribological and fatigue life behaviour. If laser texturing is done after coating deposition, friction is lower because of the better wettability of steel in comparison with coating, but suffers in fatigue life properties.

scholarly journals Laser surface texturing of tool steel: textured surfaces quality evaluation

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Peter Šugár ◽  
Jana Šugárová ◽  
Martin Frnčík
Keyword(s):  
Laser Beam ◽  
Tool Steel ◽  
Surface Texturing ◽  
Scanning Speed ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Fibre Laser ◽  
Textured Surfaces ◽  
Machined Surface ◽  
Ytterbium Fibre Laser

Abstract In this experimental investigation the laser surface texturing of tool steel of type 90MnCrV8 has been conducted. The 5-axis highly dynamic laser precision machining centre Lasertec 80 Shape equipped with the nano-second pulsed ytterbium fibre laser and CNC system Siemens 840 D was used. The planar and spherical surfaces first prepared by turning have been textured. The regular array of spherical and ellipsoidal dimples with a different dimensions and different surface density has been created. Laser surface texturing has been realized under different combinations of process parameters: pulse frequency, pulse energy and laser beam scanning speed. The morphological characterization of ablated surfaces has been performed using scanning electron microscopy (SEM) technique. The results show limited possibility of ns pulse fibre laser application to generate different surface structures for tribological modification of metallic materials. These structures were obtained by varying the processing conditions between surface ablation, to surface remelting. In all cases the areas of molten material and re-cast layers were observed on the bottom and walls of the dimples. Beside the influence of laser beam parameters on the machined surface quality during laser machining of regular hemispherical and elipsoidal dimple texture on parabolic and hemispherical surfaces has been studied.

scholarly journals Fatigue Properties and Fracture Surface Analysis of Plazma-nitrided Cold Work Tool Steel

2004 ◽  
Vol 90 (3) ◽  
pp. 170-176
Author(s):  
Daien YOKOI ◽  
Yasushi HARUNA ◽  
Nobuhiro TSUJII ◽  
Yoshihiko YOKOYAMA ◽  
Kenzo FUKAURA
Keyword(s):  
Fracture Surface ◽  
Surface Analysis ◽  
Tool Steel ◽  
Cold Work ◽  
Fatigue Properties ◽  
Fracture Surface Analysis ◽  
Cold Work Tool Steel

Microstructure and mechanical behavior of pulsed laser surface melted AISI D2 cold work tool steel

2013 ◽  
Vol 265 ◽  
pp. 653-662 ◽  
Author(s):  
N. Yasavol ◽  
A. Abdollah-zadeh ◽  
M. Ganjali ◽  
S.A. Alidokht
Keyword(s):  
Mechanical Behavior ◽  
Tool Steel ◽  
Cold Work ◽  
Pulsed Laser ◽  
Laser Surface ◽  
Aisi D2 ◽  
Cold Work Tool Steel

Influence of Laser Surface Texturing Distribution Patterns on the Hydrodynamic Lubrication

2010 ◽  
Vol 97-101 ◽  
pp. 1429-1432 ◽  
Author(s):  
Hong Bin Liu ◽  
Hong Biao Han ◽  
Yu Jun Xue ◽  
Ji Shun Li
Keyword(s):  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Distribution Patterns ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Laser Texturing ◽  
Coverage Ratio ◽  
Lubricating Film ◽  
Load Carrying ◽  
Film Lubrication

Laser Surface Texturing (LST) is an advanced method of surface micro-texturing technology. The aim of this paper is to investigate the influence of laser surface texturing distribution patterns on lubricant characteristics for laser texturing surfaces against cylindrical under conditions of film lubrication. The laser texturing surfaces are processed with power levels under YAG laser. Under conditions of constant depth and area coverage ratio of LST,patterns of the texture distribution and the sliding orientation relative to the texture were systematically varied. The experimental results suggested that 20° circumferential interval can increase the load-carrying ability of lubricating film.

scholarly journals Effects of Retained Austenite on Tension-Compression Fatigue Properties of Cold Work Tool Steel

2003 ◽  
Vol 89 (6) ◽  
pp. 718-725 ◽  
Author(s):  
Daien YOKOI ◽  
Nobuhiro TSUJII ◽  
Yoshihiko YOKOYAMA ◽  
Kenzo FUKAURA
Keyword(s):  
Tool Steel ◽  
Retained Austenite ◽  
Cold Work ◽  
Fatigue Properties ◽  
Cold Work Tool Steel

scholarly journals Effects of Laser Texture Oxidation and High-Temperature Annealing of TiV Alloy Thin Films on Mechanical and Antibacterial Properties and Cytotoxicity

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2495 ◽  
Author(s):  
Yin-Yu Chang ◽  
Jia-Hao Zhang ◽  
Heng-Li Huang
Keyword(s):  
Thin Films ◽  
High Temperature ◽  
Surface Texturing ◽  
Antibacterial Properties ◽  
Pure Titanium ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Cell Cytotoxicity ◽  
High Temperature Annealing ◽  
Laser Texturing

Titanium dioxide and vanadium oxides have been applied extensively in industrial and medical fields. The objective of this study was to develop various composite structures of titanium and vanadium oxide (Ti-V-O) coatings on pure titanium through high-temperature annealing and laser texturing oxidation, separately; additionally, surface morphologies, tribological and hydrophilic properties, and antibacterial and biocompatibility abilities of these Ti-V-O coatings were evaluated. TiV alloy thin films were deposited on pure titanium and then annealed to form Ti-V-O coatings through thermal oxidation and laser texturing oxidation. Ball-on-disc wear tests and contact angle tests were conducted to evaluate the tribological properties and wettability of the coatings, respectively. The antibacterial activity of the coatings was estimated by SYTO9 nucleic acid staining with Staphylococcus aureus (Gram-positive bacteria). The cell cytotoxicity of the coatings was analyzed following the ISO 10995-5:2009 standard with human skin fibroblast cells. The Ti-V-O coatings, subjected to annealing at 700 °C, demonstrated higher hardness (Hv 1171) and a lower friction coefficient (0.6). The highest hardness (Hv 2711) and the lowest friction coefficient (0.52) were obtained for the Ti-V-O after laser surface texturing oxidation at 100 kHz. The oxide coating obtained from 100 kHz laser texturing oxidation exhibited the lotus effect because of its systematic textured microstructures, and displayed superhydrophobic surface properties. Compared with the unannealed TiV coating, both the samples with high-temperature annealing and laser surface texturing oxidation had excellent antibacterial properties to Staphylococcus aureus. However, the Ti-V-O thin films exhibited notable cell cytotoxicity. Although the cell viability on Ti-V-O coatings were not ideal, this study confirmed improvement in surface hardness, tribology, and antibacterial performance in Ti-V-O coatings, which may have potential for use in biomedical tools, devices, and equipment.

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