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Wear damage of Alloy 690TT in partial and gross slip fretting regimes at 320°C was investigated. The obtained fretting regimes were controlled by modifying the displacement amplitude. In partial slip regime, adhesive wear and fatigue crack were the main wear mechanisms. The nanostructured tribological transformed structure (TTS) formed due to incomplete dynamic recrystallization (DRX) with existence...
Fretting wear experiments have been performed in high temperature water with a range of normal forces to investigate the wear behavior of Alloy 690TT tube sections oscillating against stainless steel Type 304 plates. Alloy 690TT is a Ni-based alloy containing Fe, Cr, and other minor additions. Results of tests conducted in an autoclave chamber in pressurized 288°C water, indicated that fretting wear...
Fretting wear damage is a concern in heat exchanger tube of Inconel 600 in nuclear power plants. Fretting wear tests of Inconel 600 alloy against stainless steel type 304 were performed for the purpose to identify changes in the wear mechanisms with number of cycles. The results indicated that as cycles increased, the wear volume, worn scar depth and plastic regime at the scar edge first slowly increased,...
The carbides precipitated along grain boundary and within the grain in Inconel 600 mill-anneal alloy were produced by aging treatment for different times. The effect of precipitated carbides on the friction coefficient and wear volume was analyzed. The surface and cross sectional morphologies of wear scar were subsequently investigated by scanning electron microscopy (SEM), laser scanning confocal...
TiB/TiC-reinforced titanium matrix composite coatings were prepared by laser cladding on Ti6Al4V substrates. The effects of the addition of Y 2 O 3 on the microstructure, microhardness, fracture toughness, and dry sliding wear resistance of the coatings were investigated. Microstructural observation showed that the coatings mainly consisted of TiC and TiB particles uniformly dispersed...
The fretting test on Inconel 600 alloy at different displacement amplitudes was conducted at room temperature in air with a relative humidity of 30–40% using an SRV IV fretting test rig. The effects of displacement amplitude on the ratio of tangential force to normal load and wear volume were analyzed. The worn surfaces and cross-sectional morphologies were subsequently investigated using optical...
Rubbing pairs of ceramics and stainless steel are widely used under the hydrogen peroxide (H 2 O 2 ) strong oxidizing environment. It is crucial to study the wear behavior and failure modes of the rubbing pairs. The tribological properties of three types of ceramics (ZrO 2 , Al 2 O 3 , Si 3 N 4 ceramics) and 1Cr18Ni9Ti stainless steel rubbing...
This study employed thermal oxidation (TO) treatment as a way of improving the wear resistance of Ti–6Al–4V/10vol.% TiC composites (TMCs) – especially at high loading conditions. The study revealed the formation of a uniform oxide layer (2.6±0.35μm thick) supported by an oxygen diffused zone (31.2±11.6μm deep) on the composite's surface when thermal oxidation was carried out at 800°C for 20min. The...
A three-dimensional (3D) finite element (FE) simulation of a rigid Rockwell C indenter scratching a TiN/Ti-6Al-4V coating/substrate system is presented. Coulomb friction between the indenter and the surface of the coating/substrate system was considered. The material properties of the coating and substrate were assumed to be elastic–plastic following a bilinear law with isotropic strain hardening...
In order to find a link between results obtained from a laboratory erosion tester and tests carried out on a pneumatic conveyor, a comparison has been made between weight loss from bends on an industrial-scale pneumatic conveyor and erosion rates obtained in a small centrifugal erosion tester, for the same materials. Identical test conditions have been applied to both experiments so that comparable...
A new computational model for the prediction of particle rotational velocity in a centrifugal accelerator erosion tester is presented. Particles emerging from the acceleration tube of the tester have a rotation and this is known to affect erosion. The model proposes that the particle rotational speed is related to the particle shape angle and size of the particle, the length of the acceleration tube,...
Fractals can be extremely useful when applied to tribology. Obtaining fractal descriptions of engineering surfaces and wear particles requires surface topography information to be measured, digitized and processed. Such procedures can be rigorous. This article compares various methods to calculate profile and surface fractal dimension. Profile fractal dimension is computed using three available methods,...
The erosive wear behaviour of ultrahigh molecular weight polyethylene (UHMWPE) was tested by an air-borne particle erosion equipment. The effects of impact angle, velocity and the particle hardness on the erosive wear of UHMWPE were demonstrated. By scanning electronic microscopy (SEM), the worn surface morphology was analyzed. The plastic deformation and microcracking are the main erosion mechanisms...
In a newly developed chemical deposition process, a layer of metal cobalt film is coated on the surface of ultrafine ceramic powders of Al 2 O 3 and TiC. The mixture of the two kinds of Co-coated powder (about 70 wt.%Al 2 O 3 -Co + 30 wt.%TiC-Co) is hot-pressed into advanced Al 2 O 3 -TiC-Co (ATC) ceramic. Scanning electron microscopy observation is...
The friction and wear properties of hot-pressed Al 2 O 3 -TiC-Co advanced ceramics (called ATC here), which have been made by use of Al 2 O 3 and TiC powders chemically coated with a cobalt film, have been studied in this paper with the help of a pin-on-disk apparatus in a scanning election microscope. The experiments show that the friction behavior of ATC varies with...
Erosion-corrosion experiments on AISI321 stainless steel in 10 wt.% H 2 SO 4 + 15 wt.% corundum sand were carried out by means of a rotating system with the specimen on the edge of a disc. Dynamic polarization curves during erosion-corrosion were measured at different rotating rates and the weight-loss kinetics was studied at different applied potentials and rotating rates. The straining...
Scanning electron microscopy observation and ε-ln V n curves analysis are employed to investigate erosion behavior of a series of zirconia-toughened AT 30 (70wt.%Al 2 O 3 -30wt.%TiC) ceramics, and evaluate their erosion resistance to various erosive situation. The results show that with increase of normal component of impact velocity, the eroded surfaces exhibit...
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