Coating fracture toughness determined by Vickers indentation: an important parameter in cavitation erosion resistance of WC–Co thermally sprayed coatings

2004 ◽  
Vol 177-178 ◽  
pp. 489-496 ◽  
Author(s):  
M.M Lima ◽  
C Godoy ◽  
P.J Modenesi ◽  
J.C Avelar-Batista ◽  
A Davison ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Vickers Indentation ◽  
Thermally Sprayed Coatings ◽  
Cavitation Erosion Resistance ◽  
Thermally Sprayed ◽  
Sprayed Coatings ◽  
Coating Fracture

ACI TYPE CF10SMnN

Alloy Digest ◽  
1998 ◽  
Vol 47 (8) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Stainless Steel ◽  
High Temperature ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Cast Alloy ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cavitation Erosion Resistance

Abstract Type CF10SMnN is a 17Cr-8.5Ni-8Mn-4Si cast alloy with excellent galling resistance, cavitation-erosion resistance, high mechanical properties, and good castability. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance as well as casting and heat treating. Filing Code: SS-727. Producer or source: Various stainless steel casting companies.

Influence of adhesion strength on cavitation erosion resistance of diamond-like carbon coating

2019 ◽  
Vol 71 (5) ◽  
pp. 724-730 ◽  
Author(s):  
Feng Cheng ◽  
Weixi Ji ◽  
Junhua Zhao
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Adhesion Strength ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Test Rig ◽  
Content Type ◽  
Dlc Coating ◽  
Cavitation Erosion Resistance ◽  
Coating Fracture

Purpose The disbonding of DLC coating is a main failure mode in the high-speed cavitation condition, which shortens the service life of the bearing. This study aims to investigate influence of adhesion strength on cavitation erosion resistance of DLC coating. Design/methodology/approach Three DLC coatings with different adhesion strengths were grown on the 304 steel surfaces by using a cathodic arc plasma deposition method. Cavitation tests were performed by using a vibratory test rig to investigate the influence of adhesion strength on cavitation erosion resistance of a DLC coating. The cavitation mechanism of the substrate-coating systems was further discussed by means of surface analyses. Findings The results indicated that, the residual stress decreased and then increased with the increasing DLC coating thickness from 1 µm to 2.9 µm, and the lower residual stress can improve the adhesion strength of the DLC coating to the substrate. It was also concluded that, the plastic deformation as well as the fracture occurred on the DLC coating surface at the same time, owing to higher residual stress and poorer adhesion strength. However, lower residual stress and better adhesion strength could help resist the occurrence of the coating fracture. Originality/value Cavitation tests were performed by using a vibratory test rig to investigate the influence of adhesion strength on cavitation erosion resistance of the DLC coating. The plastic deformation and the fracture occurred on the DLC coating surface at the same time, owing to higher residual stress and poorer adhesion of coating. Lower residual stress and better adhesion of coating could resist the occurrence of the DLC coating fracture.

scholarly journals Laser Surface Melting of Thermally Sprayed Coatings and Effects on the Erosion Behaviors of Coatings

1990 ◽  
Author(s):  
Jia Shu Sun
Keyword(s):  
Erosion Resistance ◽  
Laser Surface ◽  
Solid Particle Erosion ◽  
Particle Erosion ◽  
Laser Melting ◽  
Thermally Sprayed Coatings ◽  
Erosion Mechanisms ◽  
Plasma Sprayed ◽  
Thermally Sprayed ◽  
Sprayed Coatings

In this work the effects of laser melting on the microstructure and the solid particle erosion behavior of flame sprayed Ni-Cr-B- and Fe-Cr-B-alloy coatings, plasma sprayed chromium carbide (Ni-Cr) and (WC-Co) (Ni-Cr) alloy coatings have been studied. The results have shown that laser melting has modified the microstructure of sprayed coatings, eliminated the porosity of sprayed coatings and increased the erosion resistance of the coatings. The erosion mechanisms of these coatings have been investigated.

Cavitation erosion behavior of microwave-processed Ni–40Cr3C2 composite clads: A parametric investigation using ultrasonic apparatus

2020 ◽  
pp. 146442072096112
Author(s):  
Jonty Mago ◽  
Sandeep Bansal ◽  
Dheeraj Gupta ◽  
Vivek Jain
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Mass Loss ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Immersion Depth ◽  
Standoff Distance ◽  
Ultrasonic Apparatus ◽  
Microwave Cladding ◽  
Cavitation Erosion Resistance

Cavitation erosion is the primary cause of material failure of the hydroelectric power plant components. The rapid development in the advanced surface engineering techniques has provided an effective treatment solution for cavitation erosion. One such novel method is microwave cladding. Hence, the Ni–40Cr3C2 composite clad was deposited on austenitic stainless steel (SS-316) using a microwave cladding process in the present study. The processing was carried out in a domestic microwave oven of 2.45 GHz frequency and 900 W power. The developed clad was thoroughly characterized for the metallurgical and mechanical properties related to its behavior as a successful cavitation erosion resistance material, like microstructure, crystal structure, porosity, microhardness, flexural strength, and fracture toughness. The results showed that the stripe-type and agglomerated carbides were present in the Ni–40Cr3C2 clad. The developed composite clad consists of various carbides (SiC, Ni3C, Cr3Ni2SiC, Cr7C3, and NiC) and intermetallic phases (Ni3Fe, Ni2Si, and Cr3Si). Microhardness, flexural strength, and fracture toughness of the microwave-processed clad were observed to be 605 ± 80 HV0.3, 813.23 ± 16.2 MPa, and 7.44 ± 0.2 MPa√m, respectively. The microwave-processed composite clad performance in terms of cavitation erosion resistance was determined using the ultrasonic apparatus (ASTM-G32-17). The cavitation experiments were carried out according to Taguchi L9 orthogonal array, taking into account three parameters: standoff distance, amplitude, and immersion depth. The developed composite clad exhibited significant resistance (mass loss 7.6 times lesser as compared to SS-316) to cavitation erosion. ANOVA results showed the standoff distance as the most important factor followed by amplitude and immersion depth. Least cavitation resistance was observed at a smaller standoff distance, higher amplitude, and lower immersion depth. Linear regression equations were obtained to establish the correlation between parameters and cumulative mass loss. The microwave clad specimens tested at optimized test parameters were damaged in the form of fractured intermetallic, extruded lips, pits, and craters.

Influence of microwave heating on metallurgical and mechanical properties of Ni-40Cr3C2 composite clads in the context of cavitation erosion resistance characteristics

2020 ◽  
pp. 095440622094034
Author(s):  
Jonty Mago ◽  
Sandeep Bansal ◽  
Dheeraj Gupta ◽  
Vivek Jain
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Scanning Electron Microscopy ◽  
Flexural Strength ◽  
Microwave Heating ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Material System ◽  
Cavitation Erosion Resistance ◽  
Scanning Electron

Surface modification is one of the most reliable solutions for protecting the material damage in hydraulic turbines due to cavitation phenomena. However, the conventional coating/cladding process has many drawbacks like high porosity, weak adhesion strength, and poor fracture toughness. In contrast, the cladding process with microwave hybrid heating can overcome these limitations. Hence, this study aims to develop the microwave processed composite clad of Ni-based alloy with 40% Cr3C2 (by wt.) on SS-316 substrate in the domestic microwave oven of 2.45 GHz frequency and 900 W power. The selection of the material system for this study was based on mitigating the effect of cavitation erosion. The thorough metallurgical and mechanical characterization of the developed composite clad was done. Microstructural characterization using scanning electron microscopy revealed that the developed composite clads had a uniform thickness of 600 µm and free from interfacial cracks and visible pores (measured porosity ∼1.67% – as per ASTM B276). Uniformly dispersed hexagonal and stripe type carbides precipitate in the Ni-based alloy matrix of the composite clad was observed through scanning electron microscopy images. X-ray diffraction analysis shows that various hard carbides (SiC, Ni3C, Cr3Ni2SiC, Cr7C3, and NiC) and intermetallic (Ni3Fe, Ni2Si, and Cr3Si) phases were formed during microwave heating. The microhardness, flexural strength, fracture toughness of the Ni-40Cr3C2 clads were evaluated. The results reveal that the composite clad possesses microhardness = 605 ± 80 HV0.3 (∼3 times SS-316), flexural strength = 813.23 ± 16.2 MPa, and fracture toughness = 7.44 ± 0.2 MPa√m. The appropriate value of these properties makes this composite clad suitable for cavitation erosion resistance application.

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