Nanomechanical and Wear Behavior of Microtextured Carbide-Coated CoCrMo Alloy Surfaces

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Geriel A. Ettienne-Modeste ◽  
L. D. Timmie Topoleski
Keyword(s):  
Elastic Modulus ◽  
Surface Morphology ◽  
Microwave Plasma ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Wear Testing ◽  
Wear Properties ◽  
Artificial Joints ◽  
Cocrmo Alloy ◽  
Nanomechanical Properties

The nanomechanical properties of a CoCrMo medical implant alloy and a novel microtextured carbide-coated CoCrMo alloy (MTCC) surface—hardness and elastic modulus—were examined using nanoindentation. The MTCC surfaces may be a successful alternative bearing material for artificial joints. Understanding the nanomechanical, material properties, and surface morphology of the MTCC–CoCrMo surface are important for designing wear resistant artificial joints. The microtextured carbide surfaces were created using a microwave plasma-assisted chemical vapor deposition reaction (MPCVD). Nanomechanical properties, volumetric wear properties, and surface morphology were measured and used to determine the performance of the conventional CoCrMo alloy and MTCC surfaces (processed for either 2 or 4 h) in static environments and under severe wear conditions. The hardness, elastic modulus, and surface parameters of the 4-h MTCC surfaces were always greater than the 2-h MTCC and CoCrMo alloy surfaces. The nanomechanical properties changed for the CoCrMo alloy and 2-h and 4-h MTCC surfaces after, in contrast to before, wear testing. This indicates that the wear mechanisms affect the nanomechanical results. Overall, the 4-h MTCC surfaces had greater wear resistance than the 2-h MTCC or CoCrMo alloy surfaces.

scholarly journals Experimental Investigation on the Wear and Damage Characteristics of Machined Wheel/Rail Materials under Dry Rolling-Sliding Condition

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 472
Author(s):  
Peijie Liu ◽  
Yanming Quan ◽  
Junjie Wan ◽  
Lang Yu
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Surface Defects ◽  
Wear Behavior ◽  
Friction Pair ◽  
Surface Hardness ◽  
Wear Testing ◽  
Wear Loss ◽  
Machining Parameters ◽  
Deformation Layer

To guarantee the smooth operation of trains, rail grinding and wheel turning are necessary practices to remove surface defects. Surface integrity of machined wheel/rail materials is significant to affect their tribological performance. In this paper, firstly, the wheel specimens were turned by a CNC lathe and the rail specimens were ground by a cylindrical grinding machine with various machining parameters. Then, the wear and damage behavior of the machined wheel/rail discs was systematically investigated via a twin-disc wear testing apparatus under dry rolling-sliding condition. The experimental results show that the surface hardness of rail discs after machining is slightly higher than that of wheel discs, while the surface roughness and plastic deformation layer of wheel discs are much larger than those of rail discs. The surface hardness increase degree of rail discs and their thickness of plastic deformation layer are greater than those of wheel discs after the rolling-sliding test. The wear loss of wheel discs is much larger than that of rail discs. Surface roughness, hardness and plastic deformation layer of wheel/rail discs after machining exert a comprehensive effect on the wear behavior, and friction pair with appropriate original surface hardness and roughness generates the smallest amount of wear loss.

Ti6Al4V Surface Hardness Improvement by Duplex Coating

2013 ◽  
Vol 701 ◽  
pp. 370-374
Author(s):  
Yusliza Yusuf ◽  
Zulkifli Mohd Rosli ◽  
Jariah Mohamad Juoi ◽  
Zainab Mahamud ◽  
Kwan Wai Loon
Keyword(s):  
Microwave Plasma ◽  
Plasma Nitriding ◽  
Microstructural Analysis ◽  
Surface Hardness ◽  
Hardness Measurement ◽  
Compound Layer ◽  
Ti6al4v Alloy ◽  
Process Time ◽  
Wear Properties ◽  
Duplex Coating

Ti6Al4V alloy are among the most widely used materials in engineering applications. This is because their relatively beneficial properties. However, inadequate wear properties of Ti6Al4V alloy have largely constrained the application for this material. In this study, Plasma nitriding of the Ti6Al4V was performed using microwave plasma technique at 600°C for 1hour, 3 hours and 5 hours then followed with deposition of CrN on plasma nitrided samples for duplex coating purposes. Microstructural analysis and hardness measurement revealed that formation of Ti2N and TiN phases indicating the formation of compound layer is observed for substrate nitrided at temperature as low as 600°C 1 hour and a substantial increase on the surface hardness of plasma nitrided Ti6Al4V is observed with an increase of process time. The duplex coating obtained in this study has significant surface hardness property and superior as compared with CrN coatings deposited on as received Ti6Al4V.

Microstructure, Mechanical and Wear Properties Study of Vanadium Carbide Particles Reinforced Iron Matrix Composite

2012 ◽  
Vol 476-478 ◽  
pp. 686-690 ◽  
Author(s):  
Jing Wang ◽  
Si Jing Fu ◽  
Bing Hua Jiang ◽  
Yi San Wang
Keyword(s):  
Electron Microscope ◽  
Matrix Composite ◽  
Vanadium Carbide ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Testing ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Iron Matrix ◽  
Composite Hardness

This study dealt with the processing, microstructure and wear behavior of vanadium carbide reinforced iron matrix composite. Powder technology combined with in situ synthesis was used to successfully fabricate the composite. The microstructure of the composite was characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope. The microstructural study reveals that the round VC particles are distributed uniformly in the iron matrix, the interface between the iron matrix and VC is clean, and no interface precipitates is found. Dry-sliding wear behavior of VC-Fe composite was tested using MM-200 wear testing machine. The results indicate that the composite has excellent wear resistance, and microploughing and grooving are the dominant wear mechanisms for the composite. Hardness and bend strength of the composite are 62HRC and 990.1MPa, respectively.

Analysis and Measurement of Volume Change by Transformation of Crystal Between Hf and HfOx Thin Film During Oxidation Using Nanoindenter

2015 ◽  
Vol 15 (10) ◽  
pp. 7593-7597
Author(s):  
Myung Joon Park ◽  
Soo In Kim ◽  
Chang Woo Lee
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Elastic Modulus ◽  
Annealing Temperature ◽  
Surface Hardness ◽  
Surface Oxidation ◽  
Analysis Method ◽  
Monoclinic Crystal ◽  
Nanomechanical Properties ◽  
Induced Stresses

In this study, nanomechanical properties were analyzed using a nanotribology method. The nanoindenter system is the main analysis method in nanotribology. The nanoindenter can measure the induced stresses, elastic modulus, and stabilities of Hf and HfO2 thin film surfaces as a function of the annealing temperature. The surface hardness and elastic modulus decreased, except at 600 °C, from 8.1 to 6.22 GPa and from 143.87 to 93.68 GPa, respectively, as the annealing temperature was increased from the as-deposited state to 800 °C. These results were related to the surface oxidation of the Hf thin film or the formation of a HfO2 monoclinic crystal. The change in the crystal structure caused an increase in volume that subsequently induced a compressive stress.

Effect of Subsurface Deformation on Sliding Wear Behavior of Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications

2014 ◽  
Vol 616 ◽  
pp. 270-274
Author(s):  
Yoon Seok Lee ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Kengo Narita ◽  
Junko Hieda ◽  
...  
Keyword(s):  
Wear Mechanisms ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Test ◽  
Wear Testing ◽  
Wear Properties ◽  
Delamination Wear ◽  
Frictional Wear ◽  
Fixation Devices ◽  
Spinal Fixation Devices

The wear mechanisms of conventional Ti–6Al–4V extra-low interstitial (Ti64) and the new Ti–29Nb–13Ta–4.6Zr (TNTZ) were studied to investigate the wear properties of Ti64/TNTZ for application in spinal fixation devices. Ti64 and TNTZ balls and discs were first prepared as wear-test specimens. A ball-on-disc frictional wear-testing machine was used in air to perform the frictional wear tests of the Ti64 and TNTZ discs mated against Ti64 and TNTZ balls. The wear mechanisms were investigated using a scanning electron microscopy to analyze the worn surfaces and wear debris. The volume losses for the TNTZ discs were larger than those for the Ti64 ones, regardless of the mating ball material. Furthermore, the morphologies of the wear tracks and the debris of the Ti64 and TNTZ discs were different, suggesting that the wear mechanisms for the Ti64 and TNTZ discs were abrasive and delamination wear caused by mild and severe subsurface deformations of the Ti64 and TNTZ, respectively, regardless of the mating ball material.

scholarly journals Dry Sliding Wear Behavior of Austenitic Stainless Steel Material by Gas Nitriding Process

2021 ◽  
Vol 309 ◽  
pp. 01181
Author(s):  
K. Ramya Sree ◽  
D. Raguraman ◽  
J. Saranya ◽  
Animesh Bain ◽  
V. Srinivas Viswanth ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Case Depth ◽  
Nitriding Process ◽  
Dry Sliding Wear ◽  
Low Carbon ◽  
Wear Properties ◽  
Gas Nitriding ◽  
Steel Material

In industries, components must operate under extreme conditions such as high load, speed, temperature and chemical environment. Materials are selected according to commercial availability, cost and their properties such as strength, hardness, etc. AISI 904L is a high-alloy stainless steel with low carbon content, poor surface hardness and wear characteristics. Many engineering failures are caused by fatigue, corrosion, and poor wear resistance, begins at the surface level. This causes cracks in the surface, reducing the material’s life. The surfaces of the materials were subjected to severe thermal, chemical, and shock loads. The selected AISI 904L materials for this work were subjected to gas nitriding process and processed with 3 different time parameters such as 12 hours, 18 hours and 24 hours respectively and named as GN1, GN2 and GN3. The treatments were done at a constant temperature of 650°C. Gas nitriding, in comparison to other nitriding processes such as plasma and liquid nitriding, provides good dimensional stability, reduced deformation, and uniform case depth regardless of the size and shape of the specimen. To analyze the wear properties, a pin on a disc machine is used. Finally, metallographic studies were performed by scanning electron microscopy.

scholarly journals Assessment of Wear Properties under Dry Sliding Conditions on AISI 301LN Austenitic Stainless Steel by Plasma Nitriding Process

2021 ◽  
Vol 309 ◽  
pp. 01182
Author(s):  
B Divyasri ◽  
Ch. Phani Rama Krishna ◽  
Pradeep Jayappa ◽  
G. Keerthi Reddy ◽  
V. Vinay Kumar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Behavior ◽  
Plasma Nitriding ◽  
Research Work ◽  
Surface Hardness ◽  
Wear Test ◽  
Iron Nitride ◽  
Variable Load ◽  
Test Machine ◽  
Wear Properties

In industry, mechanical components must operate under conditions conditions such as variable load, speed, temperature and various chemical environments. Materials are selected depending on their application. They are selected for commercial availability, cost and properties such as strength, hardness etc. Many engineering errors are due to fatigue, corrosion and poor wear resistance occurring on its surface. This causes cracks in the surface that shortens the service life of the material. Also, the surfaces of materials are exposed to strong thermal, chemical and shock loads. Chosen for this research work, AISI 301LN materials have low surface hardness and poor wear properties, which can limit their applications were components mate each other. AISI 301LN stainless steel was treated with plasma nitriding at a low temperature of about 650°C. It was observed that a mixture of ferrites and gradually nitrogenous matter accumulates in the following layers namely iron nitride. Further nitriding was carried out to 20 hrs, 40 hrs, 60 hrs and the specimen were named as PL1, PL2 and PL3 respectively. It was observed that Cr-N layer were formed on the outer surface. Wear tests were carried out on a tribological wear test machine to study the wear behavior. A comparison is made between treated and untreated specimens. The microstructures are investigated with scanning electron microscope.

A Comparative Study on the Wear Behavior of Cast and Forge Aged A356 Alloy with Addition of Grain Refiner and/or Modifier

2014 ◽  
Vol 592-594 ◽  
pp. 1255-1261 ◽  
Author(s):  
D.G. Mallapur ◽  
D.G. Sondur ◽  
K.R. Udupa
Keyword(s):  
Comparative Study ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Testing Machine ◽  
A356 Alloy ◽  
Wear Testing ◽  
Unexpected Result ◽  
Wear Properties ◽  
Grain Refiner ◽  
Aged Material

In the present work, a comparative study on the wear behavior of cast aged and forge aged A356 alloy has been investigated without and with the addition of grain refiner and modifier, under dry sliding conditions using a pin-on-disc wear testing machine. The comparison study reveals that tribological properties of A356 materials are highly influenced by T6 heat treatment process. It is found in the present study that, cast aged A356 materials possess higher wear resistance as compared to forge aged materials. Apart from this, the study also reveals that cast aged material is associated with lower frictional forces and coefficient of friction as compared to the forge aged category. It is further observed in the present investigation that abrasive wear mechanism is operative in both the categories of the materials when tested with lower load for lower sliding speed and lower distance of run. At higher values of external parameters the adhesive wear mechanism dominates the wear process. Lower values of wear properties recorded by the forge aged material are an unexpected result in the present studies. It is conceived to be due to the presence of micro cracks while forging.

scholarly journals Impact-Sliding Tribology Behavior of TC17 Alloy Treated by Laser Shock Peening

2018 ◽  
Author(s):  
Meigui Yin ◽  
Wenjian Wang ◽  
Weifeng He ◽  
Zhenbing Cai
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Wear Test ◽  
Laser Shock Peening ◽  
Wear Testing ◽  
Laser Shock ◽  
Shock Peening ◽  
Multiple Impact ◽  
The Impact

Outer particles collision with certain dynamic object is not a pure impact wear behavior; it is typically accompanied by sliding wear phenomena. This study aimed investigating the impact-sliding wear performance of three different TC17 titanium alloys. One was untreated, and the other two were subjected to laser shock peening (LSP) by 5 and 7 J pulse energy, respectively. Wear test was performed on a novel impact-sliding wear testing rig, which can realize multiple impact-sliding motions by changing motion parameters in x and z directions. Present results showed that wear resistance of both treated samples improved compared with the untreated alloy. Given the increase in wear cycles, increment in wear rate of the untreated sample was constantly higher than those of treated samples. All results can be attributed to the increase in surface hardness of the material and residual compressive stress, which was also introduced after LSP.

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