Degradation of coatings based on 310S steel doped with Al and Ir additives by the scratch test

Open Physics ◽  
2011 ◽  
Vol 9 (4) ◽  
Author(s):  
Barbara Kucharska
Keyword(s):  
Critical Load ◽  
Scratch Test ◽  
Mechanical Tests ◽  
Test Method ◽  
Pvd Coatings ◽  
Coating Structure ◽  
Micro Cracks ◽  
Aluminium Addition

AbstractMechanical tests of PVD coatings made on steel 310S were carried out within this study by the scratch test method. It was found that the additions of Al and Ir caused lower critical load values compared to the coating without additions. Despite the reduction of the critical load of the coating by the aluminium addition, the effect of aluminium was considered advantageous owing to the refinement of the structure causing the coating to become more plastic and reducing the number and sizes of micro-cracks. The addition of iridium results in an embrittlement of the coating structure and its poorer adhesion to the substrate. Comparison of the findings from the scratch test with the observations from an optical and a scanning microscopes was also made.

A REVIEW ON ADHESION STRENGTH OF PEO COATINGS BY SCRATCH TEST METHOD

2018 ◽  
Vol 25 (03) ◽  
pp. 1830004 ◽  
Author(s):  
HOSSEIN SHARIFI ◽  
MAHMOOD ALIOFKHAZRAEI ◽  
GHASEM BRATAI DARBAND ◽  
SUMAN SHRESTHA
Keyword(s):  
Critical Load ◽  
Adhesion Strength ◽  
Normal Load ◽  
Scratch Test ◽  
Electrolyte Composition ◽  
Test Method ◽  
Process Time ◽  
Plasma Electrolytic ◽  
Aluminum Substrates ◽  
Peo Coatings

Adhesion strength is one of the important properties that reflects the quality of a plasma electrolytic oxidation (PEO) coating. Scratch testing can be considered as an appropriate technique to evaluate the adhesion strength of PEO coatings on magnesium, titanium, and aluminum substrates. The scratch test is usually performed either under a constant or a progressively increasing normal load, where the critical load is used as a measure of adhesion strength of the coatings. In this review paper, the effect of different factors such as duration of coating processing, electrolyte composition, and processing current density, as well as different additives to the electrolyte bath, was studied on the adhesion strength of PEO coatings formed on magnesium, titanium, and aluminum substrates. It is understood that an optimum increase in process time and input energy leads to a corresponding increase in thickness of the PEO dense oxide layer and, consequently, an increase in critical load and adhesion strength. Moreover, the electrolyte composition and additives were found to affect the coating microstructure and composition and, subsequently, the coating adhesion strength.

scholarly journals Recatest—A Technique for Qualitative and Quantitative Assessment of Deferment and Degraded PVD Coatings and CVD Layers in the Deformed Area in the Scratch Test

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2625
Author(s):  
Piotr Domanowski ◽  
Marek Betiuk
Keyword(s):  
Scratch Test ◽  
Metallographic Analysis ◽  
Tool Steels ◽  
Test Device ◽  
Coating Structure ◽  
Testing Technique ◽  
Coating Materials ◽  
Qualitative And Quantitative ◽  
Quantitative Parameters

The purpose of the paper is to present a new Recatest testing technique which uses a series of abrasions within a scratch and its innovative application to describe selected quantitative parameters of locally, plastically deformed substrate and coating materials detected on the spherical microsection in the scratch test. The exposed material structures are subject to a metallographic analysis which allows for the determination of the quantitative parameters, which in turn allow for a description of the change in dynamics of the coating structure within the scratch area as a function of load. These parameters include scratch depth (hs), coating thickness (h1), flash height (hoc, hos), depth of intended material (hd), material depth under scratch (hcp), and material depth under coating (hdb). The paper also includes a description of the Recalo test device designed by the authors, which is used to make a series of spherical abrasion traces on the scratch surface. Recalo is dedicated to the Recatest technique. The analysed material was the CrN/CrCN/HS6-5-2, AlCrN -Alcrona-Balinit/D2 coatings deposited on tool steels.

Hydrogen Sulfide Stress Cracking in a Q345R Welded Joint

2021 ◽  
Vol 1035 ◽  
pp. 486-491
Author(s):  
Yan Han ◽  
Jing Bin Luo ◽  
An Qing Fu ◽  
Cheng Xian Yin
Keyword(s):  
Hydrogen Sulfide ◽  
Welded Joint ◽  
Chemical Properties ◽  
Test Method ◽  
Hydrogen Atoms ◽  
Stress Cracking ◽  
Micro Cracks ◽  
Sulfide Stress ◽  
Macroscopic Observation ◽  
Metal Microstructure

In this paper the failure reason of Q345R Welded Joint was studied through macroscopic observation, chemical properties, metallurgical analysis, scanning electron microscope (SEM) and EDS test method. The results showed that there were a large number of micro-cracks in the fracture surface. The reason of cracking is severe banded structure in base metal microstructure, which provided opportunity for hydrogen atoms to enter into the internal of steel when contact with wet hydrogen sulfide environment. The existence of tensile stress promotes the entry of hydrogen atoms and the propagation of cracks. The welding products of this procedure are not suitable for use under sour conditions.

Nanomultilayer Coatings Based on Vanadium Nitride

2015 ◽  
Vol 237 ◽  
pp. 15-20 ◽  
Author(s):  
Jerzy Smolik ◽  
Adam Mazurkiewicz ◽  
Zbigniew Słomka ◽  
Jan Bujak ◽  
Joanna Kacprzyńska-Gołacka ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Elevated Temperatures ◽  
Young's Modulus ◽  
Composite Coatings ◽  
Multilayer Coating ◽  
High Hardness ◽  
Scratch Test ◽  
Test Method ◽  
Vanadium Nitride ◽  
Material Solution

Based on the analysis of the research directions in the field of coatings and layers with special operating properties, the production technologies of composite coatings, including the gradient, multi-layer, and multi-component coatings, should be distinct. The paper presents the results of material properties tests of a multi-layer coating Ti / TiN / TiAlNgradient / (TiAlN/VN)multinano obtained on hot working steel EN X32CrMoV3.3. The preparation of the multilayer coating was specially designed to increase the durability of forging dies in the brass forging process. The authors discuss the results of the microstructure tests for the obtained coatings (STEM+FIB) and present the hardness and Young's modulus as a function of the distance from the surface (nanoHardness Tester CSM) and the results of adhesion tests carried out using a scratch-test method. The obtained multilayer coatings were also subject to a tribological test using a tribometer tester by DUCOM. The authors indicate that the coatings based on vanadium nitride have very high hardness and Young's modulus (HV = 32–35 GPa, E = 420–450 GPa), a much lower coefficient of friction in combination with brass than steel, and a lower stability of these parameters at elevated temperatures. According to the authors, the coating represents an interesting material solution to increase the durability of forging dies in the process of brass forging.

CHARACTERISATION OF BIOMEDICAL TITANIUM LAYERS DEPOSITED BY A VACUUM PLASMA SPRAY PROCESS

2021 ◽  
Vol 55 (2) ◽  
pp. 231-235
Author(s):  
Mihailo Mrdak ◽  
Darko Bajić ◽  
Darko Veljić ◽  
Marko Rakin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hardness Test ◽  
Optical Microscope ◽  
Mechanical Tests ◽  
Test Method ◽  
Bonding Layer ◽  
Vacuum Plasma Spray ◽  
Porous Ti ◽  
Scanning Electron

In this paper we will describe the process of the deposition of thick layers of VPS-Ti coating, which is used as a bonding layer for the upper porous Ti coatings on implant substrates. In order to deposit the powder, we used HÖGANÄS Ti powder labelled as AMPERIT 154.086 -63 µm. In order to test the mechanical properties and microstructure of the VPS-Ti coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates. Mechanical tests of the microhardness of the coating were performed by the Vickers hardness test method (HV0.3) and tensile strength by measuring the force per unit area (MPa). The microhardness of the coating is 159 HV0.3, which is consistent with the microstructure. The coating was found to have a good bond strength of 68 MPa. The morphology of the powder particles was examined on a scanning electron microscope. The microstructure of the coating, both when deposited and etched, was examined with an optical microscope and a scanning electron microscope. By etching the coating layers, it was found that the structure is homogeneous and that it consists of a mixture of low-temperature and high-temperature titanium phases (α-Ti + β-Ti). Our tests have shown that the deposited layers of Ti coating can be used as a bonding layer for porous Ti coatings in the production of implants.

Influence of Aging Processes on Adhesion Properties of Metallic and Oxidic Thin Films

1994 ◽  
Vol 356 ◽  
Author(s):  
C. R. Ottermann ◽  
Y. Tomita ◽  
M. Ishiyama ◽  
K. Bange
Keyword(s):  
Low Voltage ◽  
Sol Gel ◽  
Chemical Vapour ◽  
Scratch Test ◽  
Temperature Treatment ◽  
Fused Silica ◽  
Test Method ◽  
Film Stress ◽  
Aging Effects ◽  
Adhesion Properties

AbstractAdhesion of oxidic and metallic films with thicknesses between 40 nm and 350 nm has been investigated by means of a scratch-test method based on a vibrating diamond micro-indenter. SiO2 and TiO2 films are precipitated on fused silica substrates by sol-gel techniques (SG), reactive evaporation (RE), reactive low-voltage ion plating (IP), and plasma impulse chemical vapour deposition (PICVD), and Cr-layers are produced by rf magnetron sputtering (SP). The influence of aging effects on film adhesion is investigated in respect of several conditions, like storage under ambient surroundings with differences in relative humidity or temperature treatment. A method is presented allowing control of the long-term stability of the scratch-test conditions. Temperature treatment up to 600 °C is found to have the most significant impact on adhesion properties. Adhesion increases for some SiO2 films, whereas for TiO2 layers an opposite behavior is observed. Here, the adhesion of the originally amorphous titania films is reduced due to the phase transition to polycrystalline anatase, which correlates with a significant increase in film stress.

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