Elevated-Temperature Wear Study of HVOF spray Cr3C2–NiCr-Coated Die Steels

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Pankaj Chhabra ◽  
Manpreet Kaur
Keyword(s):  
Elevated Temperature ◽  
Wear Mechanisms ◽  
Surface Damage ◽  
Die Steels ◽  
Hvof Spray ◽  
Test Parameters ◽  
Wear And Friction ◽  
Spray Technique ◽  
Die Materials ◽  
Friction Study

Abstract Wear and surface damage of tools (die materials) in the hot metal forming industry is a critical problem observed and is producing an adverse effect on the process economy. The problem occurs when tool and workpiece interact at higher temperatures. However, the research related to the wear and friction of dies is still lacking. In the present investigation, tribological (wear and friction) studies were conducted with an aim to explore the potential of Cr3C2–NiCr surface coating. The high-velocity oxy-fuel (HVOF) spray technique was used to formulate the coatings. The microhardness, surface roughness, bond strength, and porosity of the coated specimens were found and analyzed. Subsequently, elevated-temperature wear and friction study of the uncoated and coated specimens were done in the laboratory. The study was conducted at 25 N and 50 N loads. The coated specimens showed an increase in wear resistance at all test parameters. The lowest value of coefficient of friction (COF) and the specific wear-rate for the coated specimens were observed at 400 °C. Wear mechanisms were studied by the scanning electron microscopy (SEM) technique. The wear mechanisms were observed to be adhesive in nature at room temperatures and the combination of abrasive/oxidative/adhesive in nature at higher temperatures for the Cr3C2–NiCr-coated specimens.

Ultra-mild wear mechanisms of Al–12.6wt.% Si alloys at elevated temperature

Wear ◽  
2011 ◽  
Vol 271 (9-10) ◽  
pp. 1842-1853 ◽  
Author(s):  
S.K. Dey ◽  
M.J. Lukitsch ◽  
M.P. Balogh ◽  
X. Meng-Burany ◽  
A.T. Alpas
Keyword(s):  
Elevated Temperature ◽  
Wear Mechanisms ◽  
Mild Wear

Fabrication and Characterization of Aluminium Matrix Composites by High Velocity Oxy-Fuel Thermal Spraying

2012 ◽  
Vol 585 ◽  
pp. 317-321
Author(s):  
Gagndeep Singh ◽  
Hitesh Vohra ◽  
Manpreet Kaur
Keyword(s):  
Metal Matrix Composites ◽  
Metal Powder ◽  
High Velocity ◽  
Metal Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Bulk Metal ◽  
Hvof Spray ◽  
Spray Technique

The High Velocity Oxy-fuel (HVOF) spray technique has been used by many researchers to deposit composite coatings, but there is less available literature discussing the fabrication of bulk metal matrix composites by this technique. In the current study, aluminum matrix composites with dispersions of alumina (Al2O3) and silicon carbide (SiC) particulates are fabricated by HVOF spray technique. The study comprises the steps of providing the substrate, preparing a mixed powder comprising a first metal powder as a matrix and a second metal powder comprising a ceramic and selected as reinforcement. The detailed procedures to prepare the bulk by using the same are reported. An in-depth characterization of the composite formed has been performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Hardness of the composite formed is measured on Vickers microhardness tester. This study showed the possibility of fabricating bulk metal matrix composites of larger size by HVOF spray technique.

Sliding Behavior of Alumina/Nickel and Alumina/Nickel Aluminide Couples at Room and Elevated Temperature

1988 ◽  
Vol 110 (4) ◽  
pp. 646-652 ◽  
Author(s):  
Peter J. Blau ◽  
Charles E. DeVore
Keyword(s):  
Elevated Temperature ◽  
Friction Coefficient ◽  
Nickel Aluminide ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Sliding Friction ◽  
Surface Damage ◽  
Polycrystalline Alumina ◽  
Ordered Intermetallic ◽  
Pin On Disk

Nickel aluminide alloys are ordered intermetallic compounds which show promise for elevated temperature applications, some of which involve sliding contact. The present investigation was conducted to develop an initial understanding of the unlubricated sliding behavior of a nickel aluminide alloy at room and elevated temperatures. In particular, the variations in the friction coefficient and the wear track morphology during the break-in stage and subsequent transitions were studied. Pin-on-disk experiments were conducted at room temperature and at 650° C (923° K) in air using fixed 9.5 mm diameter polycrystalline alumina balls as the pin material. To provide a comparison in behavior, nickel (Ni-200) disks were tested under the same conditions. The sliding friction coefficient of alumina on nickel aluminide was considerably higher than that for alumina on nickel at room temperature, but it was only slightly higher at 650° C. The wear was similar for both materials at room temperature, but the nickel aluminide exhibited relatively mild wear at 650° C, displaying less severe surface damage than the nickel. Work on identifying key friction and wear mechanisms and on evaluating the temperature limitations for future applications will continue.

Tribological and percolation properties of polypropylene/nanodiamond soot composites

2019 ◽  
Vol 28 (6) ◽  
pp. 369-377
Author(s):  
Oleg V Lebedev ◽  
Olga I Bogdanova ◽  
Galina P Goncharuk ◽  
Alexander N Ozerin
Keyword(s):  
Friction Coefficient ◽  
Percolation Threshold ◽  
Mechanical Characteristics ◽  
Testing Procedure ◽  
Test Parameters ◽  
Wear And Friction ◽  
Drastic Increase ◽  
The Relationship ◽  
Disk Testing ◽  
Physical And Mechanical Characteristics

The relationship between surface- and bulk-related physical and mechanical characteristics of polypropylene (PP)-based composites filled with nanodiamond soot (NDS) particles was investigated. The tribological properties of a composite were considered as surface properties. Wear and friction coefficient values were measured using a steel pin-on-composite disk testing procedure under the justified set of test parameters. Loading of NDS particles to the PP matrix resulted in a drastic increase in the composite’s wear resistance. A significant increase in friction coefficient and contact temperature was observed for the composites with NDS content below a certain value assumed to be the percolation threshold for the selected processing method and components used. After the percolation threshold is reached, the friction coefficient decreases sharply and returns to the value characteristic of a filler-free PP. The effects observed were attributed to changes in properties of polymer matrix and composite melt.

Elevated Temperature Fatigue Prediction Model for AISI 4340 Gun Steel

2008 ◽  
Author(s):  
Adam Goblish ◽  
Fereidoon Delfanian ◽  
John Feldhacker ◽  
Zhong Hu
Keyword(s):  
Elevated Temperature ◽  
Prediction Model ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Proper Time ◽  
Expected Time ◽  
Gun Barrel ◽  
Test Parameters ◽  
Testing Data ◽  
Safe Operating

Cannon barrel life can be maximized by fully understanding the correlation between temperature and hoop stress and their relation to crack growth. Use of elevated temperature fatigue to predict failure of a gun barrel based on the number and type of rounds along with temperature data will both maximize the usable life of a cannon barrel and maintain a safe operating environment the men and women using these cannons. This analysis will help increase the usable life of large caliber cannon barrels; round data that is collected throughout the life of a cannon barrel will be used to determine the proper time to decommission the barrel. Experimental data was collected utilizing an MTS 858 fatigue system applying low cycle fatigue analysis. Numerous operating temperatures and stresses were calculated from various cannon round types and used to determine test parameters. From this data, a correlation was generated between stress and temperature to predict life expectancy of the test specimens. Several specimens were then cycled for various temperature and pressure combinations, thereby verifying the accuracy of the prediction model. Data was collected using methods set forth in ASTM E466-07 which dictates the standard practice for force-controlled fatigue testing. Data was analyzed using Minitab for development of the life cycle prediction model. Since the accuracy of the model dictates its reliability, this was used to provide a safety cushion to ensure that failure does not occur prior to the expected time.

Mechanical properties and residual stress of HVOF sprayed nanostructured WC-17Co coatings

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040041
Author(s):  
Hairong Sun ◽  
Jinpeng Yu ◽  
Guoqing Gou ◽  
Wei Gao
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Residual Stress ◽  
Elastic Modulus ◽  
Tensile Stress ◽  
Compressive Residual Stress ◽  
Hvof Spray ◽  
Spray Technique ◽  
Oxygen Flame ◽  
Conventional Coating

Nanostructured WC-17Co, 2C-12Co coatings and conventional WC-17Co coating were prepared by High Velocity Oxygen Flame (HVOF) spray technique. The elastic modulus, fracture toughness and crack spread path were studied. The residual stress, different phases, microstructure from surface to the depth of coatings were also analyzed. While the nanostructured WC-12Co coating showed the highest elastic modulus, the nanostructured WC-17Co coating has the highest fracture toughness. The compressive residual stress of the nanostructured coatings was higher than the conventional coating. Both WC and W2C phases showed compressive residual stress, but Co6W6C phase showed tensile stress. The distribution of residual stress showed that the stress is the lowest at the surface and the highest close to the interface.

scholarly journals Improvement in Tribological Performance of Ni-P-TiO2 Composite Coatings Using Taguchi Technique with Grey Relational Analysis

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Prasanna Gadhari ◽  
Prasanta Sahoo
Keyword(s):  
Wear Track ◽  
Normal Load ◽  
Composite Coatings ◽  
Taguchi Technique ◽  
X Ray ◽  
Relational Analysis ◽  
Test Parameters ◽  
Wear And Friction ◽  
Grey Relational ◽  
Track Diameter

Tribological performance of Ni-P-TiO2 composite coatings is improved by varying the tribological test parameters such as normal load, wear track diameter, and duration of test aiming at minimum wear and friction of the coating. Taguchi technique with grey relational analysis is employed for optimization of multiresponse problem using L27 orthogonal array (OA). Analysis of variance (ANOVA) is used to find out the significant effect of test parameters and their interactions on friction and wear behavior of the coating. ANOVA results reveal that normal load and time (test duration) have the most significant effect in controlling wear and friction of the coating. Interaction between normal load and wear track diameter has some significant effect. Scanning electron microscopy of worn surface shows abrasive wear to be predominant. The surface morphology, composition, and phase structure analysis are done with the help of scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, and X-ray diffraction (XRD) analysis, respectively.

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