scholarly journals Effects of the Processing Parameters of Friction Stir Processing on the Microstructure, Hardness and Tribological Properties of SnSbCu Bearing Alloy

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5826
Author(s):  
Beata Leszczyńska-Madej ◽  
Marcin Madej ◽  
Joanna Hrabia-Wiśnios ◽  
Aleksandra Węglowska
Keyword(s):  
Tribological Properties ◽  
Friction Stir Processing ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Friction Stir ◽  
Modification Process ◽  
Hardness Tests ◽  
Before And After ◽  
Bearing Alloy ◽  
The Impact

In the study, the friction stir processing (FSP) method was used to modify the surface layer of a tin-based bearing alloy. The modification was aimed at extending the service life of bearings by improving their tribological properties. The results of investigations of the microstructure, hardness and tribological properties of the SnSbCu bearing alloy after FSP using various rotational speeds of the tool—280, 355, 450 and 560 RPM—and the constant traverse speed of 355 mm/min are presented. Particular attention was paid to the possibility of changing the morphology of the precipitates present in the alloy, and to the impact of this parameter on improvement of the tribological properties. The research carried out in this paper covered investigations of the microstructure using light and scanning electron microscopy (SEM) along with analysis of the chemical composition in micro-areas and Brinell hardness tests. Additionally, the sizes of the SnSb and CuSn precipitates present in the microstructure before and after the modification process were determined, as were the tribological properties under technically dry friction conditions and lubrication with TU 32 oil. It was proven that using friction stir processing favors refinement of the microstructure and improves the tribological properties of the analyzed alloy.

Influence of Friction Stir Processing Parameters on the Fabrication of SiC/316L Surface Composite

2010 ◽  
Vol 297-301 ◽  
pp. 221-226 ◽  
Author(s):  
R. Salekrostam ◽  
M.K. Besharati Givi ◽  
P. Asadi ◽  
P. Bahemmat
Keyword(s):  
Stainless Steel ◽  
Friction Stir Processing ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Fusion Welding ◽  
Welding Parameters ◽  
Stainless Steel 316L ◽  
Friction Stir ◽  
The Many ◽  
Welding Processes

Compared to the many fusion welding processes that are routinely used for joining stainless steel 316L, the friction stir welding (FSW) process is an emerging solid state joining process in which the material that is being welded does not melt and is being recast. The welding parameters play a major role in deciding the weld quality. In this investigation an attempt has been made to understand the influences of rotational speed and traverse speed of the tool on the microstructure of the friction stir processing zone in stainless steel 316L. Five different tool rotational speeds have been used to fabricate the joints at four different traverse speeds from this investigation which is the optimum for the tool speed and higher or lower amounts of these parameters are not useful for the process.

scholarly journals Investigation of Impact Strength and Hardness of UHMW Polyethylene Composites Reinforced with Nano-Hydroxyapatite Particles Fabricated by Friction Stir Processing

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1041 ◽  
Author(s):  
Imran Khan ◽  
Ghulam Hussain ◽  
Khalid A Al-Ghamdi ◽  
Rehan Umer
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Friction Stir Processing ◽  
Volume Fraction ◽  
Polymeric Materials ◽  
Processing Parameters ◽  
Rockwell Hardness ◽  
Friction Stir ◽  
The Impact ◽  
Polyethylene Composites

The impact strength and surface properties of polymeric materials are of critical importance in various engineering applications. Friction stir processing (FSP) is a novel method for the fabrication of composite materials with superior mechanical properties. The main objective of this study is to investigate the impact strength and Rockwell hardness of UHMW polyethylene composites reinforced with nano-hydroxyapatite particles fabricated through FSP. The spindle speed (ω), tool traverse speed (f), volume fraction (v) of strengthening material and shoulder temperature (T) were key processing parameters. The analysis of variance (ANOVA) indicated that the selected processing parameters were significant. Microscopic investigations unveiled that high levels of (v, f) and low levels of (T, ω) caused agglomeration of the reinforcing particles and induced voids and channels, which consequently reduced the impact strength and hardness of the manufactured composite. However, medium conditions of processing parameters exhibited better distribution of particles with minimum defects, and hence resulted in better mechanical properties. Finally, the models to predict the impact strength and hardness are proposed and verified. Sets of process parameters favorable to maximize the impact strength and Rockwell hardness were worked out, which were believed to increase the impact strength, Rockwell hardness number, and ultimate tensile strength by 27.3%, 5.7%, and 11.2%, respectively.

Investigation of the effect of friction stir processing parameters on temperature and forces of Al–Si aluminum alloys

2015 ◽  
Vol 232 (3) ◽  
pp. 213-229 ◽  
Author(s):  
Mostafa Akbari ◽  
Abolfazl Khalkhali ◽  
Seyyed Mohammad Ebrahim Keshavarz ◽  
Ehsan Sarikhani
Keyword(s):  
Temperature Distribution ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Critical Role ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Measuring System ◽  
Temperature History ◽  
Friction Stir ◽  
History Of

Temperature and forces in friction stir processing (FSP) induced by process input parameters play a critical role in successful welding. In this investigation, the effect of the process parameters on the axial and longitudinal forces and temperature history of the process were investigated. The temperature distribution during the FSP was determined by placing thermocouples in the workpiece and measuring the temperature during the process. The tool forces were investigated experimentally using an especially designed load measuring system. The pin shape, rotational speed and traverse speed were the parameters taken into consideration. It was observed that increase in tool traverse speed or decrease in rotational speed leads to increase in both tool axial and longitudinal forces.

Effect of Processing Parameters on Thermo-Mechanically Affected Zone of Friction Stir Processed AZ91 Magnesium Alloy

2010 ◽  
Author(s):  
M. Taherishargh ◽  
N. Parvin ◽  
P. Asadi
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Processing Parameters ◽  
The Other ◽  
Az91 Magnesium Alloy ◽  
Friction Stir ◽  
Az91 Magnesium

AZ91 Magnesium alloy was subjected to friction stir processing (FSP). The microstructural analyses of the friction stir processed (FSPed) specimens were carried out and the effects of pass number, rotational speed, and traverse speed upon thermo-mechanically affected zone (TMAZ) were investigated. The TMAZ is consisted of a region with highly elongated grains and a partially recrystalized zone. Decreasing the rotational speed and increasing the traverse speed increased the thickness of recrystallized zone; while, the thickness of the other zone decreased. On the other hand, it lessened the gradient of the grain size from the stir zone (SZ) to the base metal. Applying several FSP passes, lead to more homogeneous TMAZ structure with the finer grain size.

Direct Extrusion of Circular Profiles with Surface Composite Produced by Friction Stir Processing

2011 ◽  
Vol 383-390 ◽  
pp. 2747-2752
Author(s):  
Arash Aghagol ◽  
Saeed Mahmoodi Darani ◽  
Karen Abrinia ◽  
Mohammad Kazem Besharati Givi
Keyword(s):  
Base Metal ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Traverse Speed ◽  
Extrusion Ratio ◽  
Friction Stir ◽  
Surface Composite ◽  
Direct Extrusion ◽  
Shoulder Diameter ◽  
Before And After

In this research, a new application of friction stir processing (FSP) in producing surface composite on circular billets was introduced. Al/Cu composite was fabricated by FSP on the surface of a 1050 aluminium cylinder with the diameter of 60 mm. Then this cylinder with surface composite was extruded with the extrusion ratio of 1.7. Finally, microstructure and microhardness were investigated before and after the extrusion. H13 hot work steel was used as the material of the tool whose pin diameter and length were 6 mm and shoulder diameter was 18 mm. The rotation and traverse speed of the tool were 1000 rpm and 25 mm/min respectively. The microstructural investigations show that the thickness of the composite layer decreases and a uniform layer of the composite remains on the surface after the extrusion. Also the microhardness measurements demonstrated that the hardness of the composite layer was higher than the base metal and the microhardness of all zones increased after the extrusion.

Effect of Processing Parameters on Superplastic and Corrosion Behavior of Aluminum Alloy Friction Stir Processed

2012 ◽  
Vol 706-709 ◽  
pp. 965-970 ◽  
Author(s):  
A. Burgueño ◽  
T. Dieguez ◽  
H. Svoboda
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Strain Rate ◽  
Friction Stir Processing ◽  
Superplastic Forming ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Localized Corrosion ◽  
Friction Stir ◽  
Major Development

Friction Stir Processing (FSP) is a variant of Friction Stir Welding, and can be used to modify the materials microstructure to functionalize it. Superplastic forming is a technological process used to produce components with very complex shapes. In the last two decades it has been a topic of major development. In Fine Structure Superplasticity (FSSP), the initial grain size exerts a strong influence on the superplastic strain rate and temperatures. Refining grain size (GS) the parameters (temperature and strain rate) of superplastic forming could be optimized. Thermal stability is also an important factor to obtain superplasticity. FSP is used to refine GS, but the optimum processing parameters are still under study over different materials. Corrosion resistance can be affected by FSP too, but the information about it is scarce. In the present study, 7075-T651 aluminium alloy was friction stir processed under different conditions in order to improve superplastic behavior. Tool profile, rotation rate and traverse speed were analyzed. Microstructures with <4 μm grain size were obtained. The maximum superplastic elongations, in a range of 740 to 900%, at 400°C were obtained at 1x10-2s-1strain rate. The results were discussed in terms of constitutive equations and microstructure evolution. Localized corrosion potentials were obtained. Localized corrosion resistance was affected by friction stir processing.

Influence of Process Parameters on Microstructure of Friction Stir Processed Mg AZ31 Alloy

2017 ◽  
pp. 1293-1305
Author(s):  
G. Venkateswarlu ◽  
M.J. Davidson ◽  
G.R.N. Tagore ◽  
P. Sammaiah
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Process Parameters ◽  
Tilt Angle ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Homogeneous Microstructure ◽  
Friction Stir ◽  
Tool Tilt Angle

Friction stir processing (FSP) has been developed on the principles of friction stir welding (FSW) as an effective and efficien new method for grain refinement and microstructural modification, providing intense plastic deformation as well as higher strain rates than other conventional severe plastic deformation methods. FSP produces an equiaxed homogeneous microstructure consisting of fine grains, resulting in the enhancement of the properties of the material at room temperature. The objective of the present paper is to examine the influence of friction stir processing (FSP) parameters namely tool rotational speed (RS), tool traverse speed (TS) and tool tilt angle (TA) on the microstructures of friction stir processed AZ31B-O magnesium alloy. This investigation has focused on the microstructural changes occurred in the dynamically recrystallised nugget zone/ stir zone and the thermo mechanically affected zone during FSP. The results presented in this work indicate that all the three FSP process parameters have a significant effect on the resulting microstructure and also found that the rotational speed has greatly influenced the homogenization of the material. The grain refinement is higher at intermediate rotational speed (1150 rpm), traverse speed (32 mm / min and tilt angle (10). It is established that FSP can be a good grain refinement method for improving the properties of the material.

Effect of Friction Stir Processing Parameters on the Properties of AA7075-T73/Al2O3 Surface Metal Matrix Composite

2020 ◽  
Vol 1002 ◽  
pp. 140-150
Author(s):  
Ali H. Al-Helli ◽  
Ahmed R. Alhamaoy ◽  
Ayad Murad Takhakh
Keyword(s):  
Friction Stir Processing ◽  
Particle Distribution ◽  
Surface Hardness ◽  
Base Material ◽  
Processing Parameters ◽  
Optical Microscope ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Metal ◽  
Number Of Passes

Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences, showed that Al2O3 particles were in a good interior distribution inside the basement. This technique produced excellent bonding between the surface composite and the base material. On other hand the surface hardness was increased about 25% as compared with the substrate. In addition, grain matrix refinement and enhanced particle distribution were obtained after each FSP pass. Also the dispersion of Al2O3 particles in the stirred area became more homogeneous and the average hardness improved by increasing the number of passes.

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