scholarly journals Cavitation Resistance of Elastomeric Coatings Deposited by Different Methods

2019 ◽  
Vol 56 (4) ◽  
pp. 875-881
Author(s):  
Costel-Relu Ciubotariu ◽  
Doina Frunzaverde
Keyword(s):  
Stainless Steel ◽  
Cavitation Erosion ◽  
Martensitic Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Cavitation Resistance ◽  
Deposition Method ◽  
Material Loss ◽  
Testing Period ◽  
Erosion Material

In this study a fluid elastomer was applied by two different methods on a martensitic stainless steel substrate, in order to obtain coatings for protection against cavitation. The investigations regarding the resistance to cavitation erosion of the elastomeric coatings were carried out by the indirect vibratory method using the values of the cumulative erosion (material loss) developed during a testing period of 600 minutes with a 20 kHz ultrasonic vibrator at a peak-to-peak amplitude of 50 μm. The experimental results obtained in the laboratory have been processed statistically. They clearly pointed out that the deposition method significantly influences the cavitation resistance of the elastomer.

Cavitation Erosion-Corrosion Behavior of Fe-Cr Steel Induced by Ultrasonic Vibration

2020 ◽  
Vol 989 ◽  
pp. 312-317
Author(s):  
Hussam L. Alwan ◽  
Yury S. Korobov ◽  
N.N. Soboleva ◽  
D.A. Prokopyev
Keyword(s):  
Stainless Steel ◽  
Surface Topography ◽  
Cavitation Erosion ◽  
Martensitic Stainless Steel ◽  
Cavitation Resistance ◽  
Material Loss ◽  
Sem Micrographs ◽  
Test Conditions ◽  
Aisi 420 ◽  
Erosion Corrosion

A resistance of cavitation erosion-corrosion of the AISI 420 martensitic stainless steel was evaluated in this study. The cavitation resistance of this stainless steel has been examined using an ultrasonic vibratory method by applying water-voltage combination effect. The curves of cumulative material loss and erosion rate were attained and discussed. In addition, surface topography and scanning electron microscope (SEM) micrographs have been utilized to characterize the eroded surface after the cavitation test. The results have been compared with previously obtained results for the AISI 1040 steel. The cavitation results showed that the AISI 420 steel has exhibited the better resistance to cavitation comparing with the AISI 1040 steel under the similar test conditions. The total cumulative material loss of the AISI 420 was approximately three times less than that of the AISI 1040. Surface topography and SEM micrographs showed that the severity of damage of the AISI 1040 was found to be a higher compared to that of the AISI 420 steel.

Evaluation of Two Different Energy Inputs for Deposition of Stellite 6 by Laser Cladding on a Martensitic Stainless Steel Substrate

2015 ◽  
Vol 1119 ◽  
pp. 628-632
Author(s):  
Alain Kusmoko ◽  
Druce Dunne ◽  
Hui Jun Li
Keyword(s):  
Stainless Steel ◽  
Laser Cladding ◽  
Martensitic Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Testing Machine ◽  
Wear Testing ◽  
Chemical Compositions ◽  
Stellite 6 ◽  
Energy Inputs

Stellite 6 was deposited by laser cladding on a martensitic stainless steel substrate with energy inputs of 1 kW (MSS-1) and 1.8 kW (MSS-1.8). The chemical compositions and microstructures of these coatings were characterized by atomic absorption spectroscopy, optical microscopy and scanning electron microscopy. The microhardness of the coatings was measured and the wear mechanism of the coatings was assessed using a pin-on-plate (reciprocating) wear testing machine. The results showed less cracking and pore development for Stellite 6 coatings applied to the MSS steel substrate with the lower heat input (MSS-1). Further, the Stellite coating for MSS-1 was significantly harder than that obtained for MSS-1.8. The wear test results indicated that the weight loss for MSS-1 was much lower than for MSS-1.8. It is concluded that the lower hardness of the coating for MSS-1.8, markedly reduced the wear resistance of the Stellite 6 coating.

scholarly journals Cavitation Erosion and Wear Mechanisms of AlTiN and TiAlN Films Deposited on Stainless Steel Substrate

2019 ◽  
Author(s):  
Mirosław Szala ◽  
Mariusz Walczak ◽  
Kamil Pasierbiewicz ◽  
Mariusz Kamiński
Keyword(s):  
Stainless Steel ◽  
Elastic Modulus ◽  
Wear Mechanisms ◽  
Sliding Wear ◽  
Cavitation Erosion ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Scratch Test ◽  
Optical Microscope ◽  
Material Transfer

Stainless steel grade AISI 304 is one of the most widespread modern structural material, alas its sliding wear and cavitation wear resistance are limited. Thus, AlTiN and TiAlN coatings can be deposited for increasing the resistance to wear of stainless steel components. The aim of the work was to investigate the cavitation erosion and sliding wear mechanisms of magnetron sputtered AlTiN and TiAlN coatings deposited on SS304 stainless steel. Films surface morphology and structure were examined using a profilometer, light optical microscope (LOM) and scanning electron microscope (SEM). The mechanical properties (hardness, elastic modulus) were tested by nanoindentation tester. The adhesion of deposited coatings was determined by means of the scratch test and Rockwell test. Cavitation erosion tests were performed according to ASTM G32 (vibratory apparatus) with stationary specimen procedure. Sliding wear tests were conducted using a nano-tribo testes i.e. ball-on-disc apparatus. Wear mechanisms are strongly contingent upon the structure and morphology of the tested materials. In relation to stainless steel substrate, the PVD films present a superior resistance to sliding wear and cavitation erosion. Higher resistance was noticed for AlTiN than for TiAlN film, mainly due to its superior hardness and elastic modulus. Cavitation erosion mechanism of both, AlTiN and AlTiN coatings is prone to embrittlement, imputable to fatigue processes that result in coating rupture and spallation that consist in coating fragmentation, formation of pits and finally detachment from the substrate. Additionally, films nanoindentation results measured before and after cavitation testing indicate changes in coatings structure, that acknowledged wear mechanism that starts with coating internal delamination in flake spallation mode. In contrary to PVD coatings, steel substrate is characterized by developed cavitation erosion wear with roughened surface and plastically deformed, semi-brittle, eroded surface. Sliding wear of thin films is based on micro-ploughing mechanism. For stainless steel adhesive sliding wear mode and plastic deformation with smearing, material transfer and grooving were observed. It was confirmed that various fluid machinery components made from austenitic stainless steel that undergo cavitation erosion, can be prevented by deposition of AlTiN and TiAlN films.

scholarly journals Characterization of 410NiMo Coatings Deposited By Thermal Spray And Re- Cast With TIG On CA6NM Martensitic Stainless Steel Against Cavitation Erosion

2021 ◽  
Author(s):  
Émillyn Ferreira Trevisani Olivio ◽  
Paulo Sergio Olivio Filho ◽  
Janaina Fracaro de Souza ◽  
Paulo Victor Prestes Marcondes ◽  
João Roberto Sartori Moreno
Keyword(s):  
Stainless Steel ◽  
Thermal Spray ◽  
Stainless Steels ◽  
Cavitation Erosion ◽  
Martensitic Stainless Steel ◽  
Steel Substrate ◽  
Thermal Spraying ◽  
Welding Process ◽  
Operating Conditions ◽  
Martensitic Stainless Steels

Abstract In most applications, martensitic stainless steels are subjected to operating conditions in which good mechanical properties and wear resistance are required. CA6NM is a soft martensitic stainless steel that has high shear stress and toughness, good resistance to corrosion and cavitation, and better weldability than conventional martensitic stainless steels. These steels are susceptible to cavitation erosion which is the process of removing material due to the progressive action of erosive wear caused by the implosion of bubbles close to the surface of the mechanical element. Welding and thermal spraying are normally used to produce coatings when there is a need to increase the useful life of systems and parts, or in some cases for refurbishing. In this work 410NiMo martensitic stainless steel, in the form of wire and rod, were deposited by electric arc and flame thermal spraying processes respectively over a CA6NM martensitic stainless steel substrate. In order to improve the layer performance the sprayed coatings were remelted by the TIG welding process. The specimens were evaluated by accelerated cavitation according to ASTM G32-1 0 standard, Vickers microhardness, optical microscopy, X-ray diffraction, SEM and EDS. The tests showed coatings with low porosity and resistant to erosion by cavitation comparable with welded coatings. Making thermal spray with reflow by the TIG process an alternative in the application of this type of coating.

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