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Representative curves of acoustic emission spectrum, penetration depth (Pd), and friction force (Ft) determined by scratch test and light microscope images of the surface morphology of the cor-
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In this work, AlCr and AlCrFe coatings were deposited via magnetron sputtering on technical substrates of carbon steel C45 and titanium grade 2. The coatings feature an amorphous structure, a thickness of 3–4 μm, and are uniform in terms of thickness and chemical composition. No major defects were visible at the interface; however, there is no diff...
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Context 1
... results of coatings adhesion measurements are presented in Fig. 5. Two graphs are showing the acoustic emission signal as a function of the normal force and the friction force and penetration depth as a function of the indenter displacement, correlated with the scratch image and enlarged places of the first damage to the coatings and the end of the scratch for each coating. In the case of the AlCr ...
Context 2
... depth as a function of the indenter displacement, correlated with the scratch image and enlarged places of the first damage to the coatings and the end of the scratch for each coating. In the case of the AlCr coating on C45 steel, the first layer cohesion cracks (LC1) occurred at a load not exceeding 2N and were present until the end of the crack (Fig. 5a). No delamination of the coating was observed in the entire range of load, which proves its high adhesion to the substrate despite low cohesion. The AlCr coating on Ti delaminated at a load of 1.7N. Delamination of the coating occurred both in the indenter-substrate contact area and in extensive areas on both sides of the scratch (Fig. ...
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... crack (Fig. 5a). No delamination of the coating was observed in the entire range of load, which proves its high adhesion to the substrate despite low cohesion. The AlCr coating on Ti delaminated at a load of 1.7N. Delamination of the coating occurred both in the indenter-substrate contact area and in extensive areas on both sides of the scratch (Fig. 5b). From the moment of the first delamination to the end of the scratch, the coating was removed from the substrate along the entire ...
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... coatings (Fig. 5c and Fig. 5d) on steel and Ti substrates delaminate at a load of approx. 2.2N. On the steel substrate, after the first delamination, the coating was still locally present in the crack area up to a load of approx. 3.5 N. The AlCrFe coating produced on the Ti substrate, similarly to the AlCr coating, was removed along the entire scratch length after ...
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The development and qualification of CrAlN coatings deposited by DC magnetron sputtering offer new industrial solutions to increase the lifecycle of material forming tools (machining and shaping). This study focuses on the selection and optimization of deposition modes for CrAlN layers to be deposited on a 90CrMoV8 tool steel substrate. The adopted...
Citations
... It is essential to consider the coating thickness, in a study the AlCr coating deposited in a material was 30-50 μm, it was observed the corrosion rate, hardness and thermal conductivity for AlCr coating was 0.08 mm/ year, 800 HV and 35 W/mK respectively. The AlCr coating is excellent for corrosion, thermal and mechanical properties [13,14]. ...
This paper aims to describe the wear behaviour exhibited by aluminium chromium (AlCr) coated H13 steel. The remarkable wear resistance properties of coated H13 steel tools under various process parameters have been evaluated. In this research, the wear characteristics were analyzed for the coated tool by pin-on-disk test, and the wear track was observed on the pin and disc using a Scanning Electron Microscope (SEM) micrograph. By varying the process parameters temperature, load and spindle speed the tool’s lifespan was analysed. The L9 orthogonal array a Taguchi method was used for experimentation. The optimal parameters signal to weight ratio for the pin, disc, frictional force and wear loss on the materials were obtained. For untreated steel, plastic deformation and adhesion were found to be dominating, whereas high temperature showed very minimal effect on the coated tool. However, the load and speed significantly contributed to obtaining a better outcome. The minimal wear loss was 0.099 g on the pin and 0.059 g on the disc, where the optimal parameters were 25 N load, 700 rpm spindle speed and 150 °C temperature.
... Notably, the wear resistance and roughness were improved [11][12][13][14]. Researchers are focused on finding various types of coating deposition methods for H13 steel substrate, which will be highly efficient in highstress industry applications [15][16][17][18]. ...
The wear characteristics of coated H13 tool steel and as-casted H13 tool steel in dry sliding conditions were investigated through a pin-on-disc tribometer, where the H13 steel is used as a pin and EN31 steel is used as disc material. The study was focused on evaluating the tribological behaviour by examining the friction characteristics, surface morphology and wear performance. Initially, to improve the hardness of the untreated (as-casted) H13 steel, the tempering process where carried out on the samples, which helped elevate the hardness from 38 to 55 HRC. The worn surface of the samples was analysed using atomic force microscopy (AFM). Among the four samples (as-casted, heat-treated, AlCrN coated and TiN coated) the as-casted samples were affected by oxidation and adhesive wear. The material loss measured for as-casted, heat-treated, AlCrN and TiN samples was 30.34, 7.85, 0.78 and 0.14 mg, respectively. The measured coefficient of friction was 0.541 for as-casted, 0.492 for the heat-treated, 0.48 for the AlCrN and 0.147 for the TiN sample. From the study, the major conclusion was that the TiN coating offers major wear protection and lower friction.
This study investigates the microstructural characteristics and adhesion properties of AlFeCr coatings deposited on W320 hot work alloy steel via magnetron sputtering. The aim was to enhance adhesion properties by optimizing substrate temperature and interlayer design. The results reveal that higher substrate temperatures during deposition improve adhesion, while the introduction of gradient interlayers enhances coating compactness and continuity, reducing delamination and promoting cohesive cracking under stress. These findings highlight the critical role of interlayer engineering in optimizing the performance and durability of protective coatings.
