Microstructure and properties of Cf + TiB2/7075-modified layer by friction stir processing

2020 ◽  
Vol 10 (10) ◽  
pp. 1740-1745
Author(s):  
Shengrong Liu ◽  
Feng Xu ◽  
Hongfeng Wang ◽  
Xiaole Ge ◽  
Jiafei Pu
Keyword(s):  
Wear Resistance ◽  
Base Metal ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Friction And Wear ◽  
Base Material ◽  
Wear Test ◽  
Hardness Test ◽  
Friction Stir ◽  
Modified Layer

This study was aimed at preparing a modified layer by implanting Cf + TiB2 mixed particles into the 7075 aluminum alloy using the friction stir processing (FSP) technology. The microstructure, hardness, and wear resistance of the FSP-modified area with different process parameters were studied by microstructure analysis, hardness test, and friction and wear test. The results showed that the grains were refined and distributed evenly; the hardness was improved, especially in the central part of the region; and the friction coefficient was smaller in the FSP-modified region in comparison with the that of the base metal under different process parameters. Moreover, the wear form of the base material and the FSP-modified area was "furrow + adhesion" comprehensive wear form, in which the base metal was mainly adhesive wear and the FSP-modified area was mainly furrow wear. The grain refinement and hardness of the FSP-modified region obtained at a rotation speed of 1000 rpm and a forward speed of 10 mm/min were improved, and the wear resistance was the best.

FRICTION STIR PROCESSING OF SKD61 TOOL STEEL

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1116-1121 ◽  
Author(s):  
YINGCHUN CHEN ◽  
KAZUHIRO NAKATA
Keyword(s):  
Mechanical Property ◽  
Tool Steel ◽  
Cubic Boron Nitride ◽  
Base Material ◽  
Wear Test ◽  
Hardness Test ◽  
Test Results ◽  
Friction Stir ◽  
Polycrystalline Cubic Boron Nitride ◽  
Observation Results

In this study, SKD61 tool steel was friction stir processed (FSP) using a polycrystalline cubic boron nitride (PCBN) tool. Microstructure evolution and mechanical property in FSP zone were investigated. Microstructural observation results showed that the microstructures in FSP zone surface were fine grains in the range of 1 - 4 μm due to large plastic deformation during FSP. Micro-hardness test results showed that the average hardness value in FSP zone was 773 HV, 3.7 times the hardness in base metal (210 HV). The wear test results showed that FSP surface showed a significantly lower wear rate than that of the base material at all loads. The relation between microstructural evolution and mechanical property in FSP zone was discussed.

scholarly journals EFFECT OF ADDING BORON CARBIDE (B4C) TO POLYMER FOR PRODUCING SURFACE COMPOSITE BY FRICTION STIR PROCESSING

2018 ◽  
Vol 18 (3) ◽  
pp. 436-445
Author(s):  
Bashaer A Habeeb ◽  
Ahmed O Al-Roubaiy
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Wear Test ◽  
Homogeneous Distribution ◽  
Cylindrical Shape ◽  
Test Results ◽  
Processing Technologies ◽  
Friction Stir

Friction stir processing (FSP) is a new solid state technique, it is employed for theimprovement of the mechanical properties of a material and the production of surface layercomposites instead of conventional processing technologies. This research aims to study theability of applying Friction Stir Processing (FSP) to modify the surface of high densitypolyethylene (HDPE) reinforcing by B4C with a particle size of 0.4?m, Groove in themiddle of HDPE surface made to fill by B4C. Varity in the groove depth (0.6, 1.2 and1.8)mm used according to B4C ratio on HDPE substrate particles. Friction stir process wascarried out, using tool with cylindrical shape of pin and shoe tool to produce surface layercomposite. The effect of processing parameters including rotational and transverse speeds onthe mechanical properties of composite layer was studied. Wear test results show apronounced improvement in wear resistance of HDPE surface through reinforcementadditions of B4C at a ratio (5%, 10% and 15% ), where wear rate improved by (60%, 71%and 63%) respectively, as compared with as received HDPE, the surface compositeHDPE/B4C have good wear resistance. Hardness test results indicate that the hardness ofcomposite layer reinforced with (5%,10% and 15%) particles improved by( 26%, 35% and28% )respectively as compared with received HDPE. OM revealed that high tool rotationalspeed resulted in homogeneous distribution of B4C particles and vice versa.

scholarly journals The Influences of Process Parameters on the Preparation of Closed-cell Aluminum foam by Friction Stir Processing

2021 ◽  
Author(s):  
Qiu Pang ◽  
Zhengjian Wu ◽  
Zhili Hu
Keyword(s):  
Base Metal ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Aluminum Matrix ◽  
Maximum Temperature ◽  
Welding Temperature ◽  
Rotating Speed ◽  
Friction Stir ◽  
Closed Cell ◽  
Al Foam

Abstract In the present investigation, the closed-cell Al foam was fabricated by friction stir processing (FSP) combined with heat treatment. The influences of process parameters on microstructures of closed-cell Al foam precursor were investigated by optical metallographic microscope and scanning electronic microscope (OM/SEM). Fluent CFD software was developed to simulate the temperature field and flow field in friction stir processing. The cupping test values were compared for base metal and different weld passes. The results show that the welding speeds have little effect on the mixing of powder in the stir zone because of the relatively small welding heat input. However, the pore size and pore morphology are highly sensitive to change in the rotating speeds. When the welding speed is 50mm/min and the rotating speed is 2000rpm, the powder ring is continuous and uniform due to sufficient plastic deformation and flow. When the foaming time is 110s, the expansion rate of the whole foam increases rapidly, and the diameter of the pore is uniform. Numerical simulation shows that the welding heat mainly comes from the shoulder of the stirring head and the welding temperature peak appears near the stirring pin. The maximum flow velocity appears at the outer edge of the shaft shoulder in which the aluminum matrix is softened preferentially. When the rotating speed increases to 2000r/min, the velocity of the outermost edge of the shaft shoulder increases by 59.96%, and the maximum temperature at the stirring pin reaches 491℃ which is consistent with the experimental results. The formability of the joint interface is improved. The cupping test values increase with the increase of deformation temperature. Especially the cupping test value of foamed preform is close to that of base metal at 450℃.

Friction and Wear Properties of Friction Stir Welds of 5052 Al Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 745-748 ◽  
Author(s):  
Xun Hong Wang ◽  
Kuaishe Wang
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Base Material ◽  
Al Alloy ◽  
Wear Properties ◽  
Fatigue Wear ◽  
Friction Stir ◽  
Abrasion Loss ◽  
Surface Microstructures

Friction and wear behaviors have been studied between the untreated base material and the friction stir welds of 5052 aluminum alloy. To determine the wear mechanism surface microstructures of worn test samples were examined by scanning electron microscopy (SEM).Variation rule of wear-resistance property and coefficient of friction were investigated according to wear mass loss and moment of friction under different parameter condition. The results show that all of friction stir welds had lower coefficients of friction and higher wear resistance than base material. The abrasion loss of base material increased by six times when position pressure increased from 50N to 100N and the abrasion loss is as 10-20 times as that of friction stir welds. The value of friction-moment of friction stir welds is low and stable and abrasion principle had changed from grain abrasion to fatigue wear. Surface examination showed that adhesion and smearing was the main wear mechanism for friction stir welds.

Wear Mitigation in Cast Magnesium Alloy through Flyash Reinforced Friction Stir Surface Compositing

2015 ◽  
Vol 787 ◽  
pp. 627-631
Author(s):  
K. Maniraj ◽  
A.K. Lakshminarayanan
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Base Metal ◽  
Process Parameters ◽  
Optimization Technique ◽  
Wear Testing ◽  
Dry Sliding ◽  
Friction Stir ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

An attempt is made to mitigate wear in cast magnesium alloy by incorporating flyash reinforcement on the surface through friction stir processing. Wear resistance is evaluated using pin-on-disc wear testing. Effect of dry sliding wear process parameters such as speed, time and distance were studied by using design of experiments. Empirical relationships were established between the process parameters and wear resistance of base metal as well as surface composite. Further, wear map is constructed using graphical optimization technique, which can be used to predict the lower and upper bound of wear rate for the both base metal and friction stir processed surface composites under dry sliding condition.

scholarly journals Shoulder Related Temperature Thresholds in FSSW of Aluminium Alloys

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4375
Author(s):  
David G. Andrade ◽  
Sree Sabari ◽  
Carlos Leitão ◽  
Dulce M. Rodrigues
Keyword(s):  
Heat Generation ◽  
Process Parameters ◽  
Rotational Speed ◽  
Aluminium Alloys ◽  
Spot Welding ◽  
Base Material ◽  
Main Process ◽  
Welding Temperature ◽  
Friction Stir ◽  
Tool Diameter

Friction Stir Spot Welding (FSSW) is assumed as an environment-friendly technique, suitable for the spot welding of several materials. Nevertheless, it is consensual that the temperature control during the process is not feasible, since the exact heat generation mechanisms are still unknown. In current work, the heat generation in FSSW of aluminium alloys, was assessed by producing bead-on-plate spot welds using pinless tools. Coated and uncoated tools, with varied diameters and rotational speeds, were tested. Heat treatable (AA2017, AA6082 and AA7075) and non-heat treatable (AA5083) aluminium alloys were welded to assess any possible influence of the base material properties on heat generation. A parametric analysis enabled to establish a relationship between the process parameters and the heat generation. It was found that for rotational speeds higher than 600 rpm, the main process parameter governing the heat generation is the tool diameter. For each tool diameter, a threshold in the welding temperature was identified, which is independent of the rotational speed and of the aluminium alloy being welded. It is demonstrated that, for aluminium alloys, the temperature in FSSW may be controlled using a suitable combination of rotational speed and tool dimensions. The temperature evolution with process parameters was modelled and the model predictions were found to fit satisfactorily the experimental results.

Improving Wear Resistance of AISI 316LN Austenitic Stainless Steel Using Friction Stir Processing

2015 ◽  
Vol 787 ◽  
pp. 421-425
Author(s):  
A. Vignesh ◽  
V.G. Vijay Prakaash ◽  
A.K. Lakshminarayanan
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Austenitic Stainless Steel ◽  
Friction Stir Processing ◽  
Sliding Wear ◽  
Dry Sliding Wear ◽  
Friction Stir ◽  
Pin On Disc ◽  
Metal Microstructure ◽  
Equiaxed Grains

An attempt is made to modify the surface metallurgically and enhance the wear resistance of AISI 316LN austenitic stainless steel using friction stir processing. Friction stir welding tools made up of tungsten based alloy with pin and pinless configuration was used. Fine equiaxed grains were observed in the friction stir processed zone irrespective of tool configuration used. Dry sliding wear resistance was evaluated using pin-on-disc wear tester and it is found that, the friction stir processed zone showed superior wear resistance compared to the base metal. Microstructure, micro hardness, and worn surfaces were used to correlate the results obtained.

Experimental Study on Friction and Wear between Drill Collar and Casing

2016 ◽  
Vol 847 ◽  
pp. 460-465
Author(s):  
Ben Sheng Huang ◽  
Yao Zhu
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Oil And Gas ◽  
Wear Test ◽  
Hardness Test ◽  
Oil And Gas Fields ◽  
Key Issues ◽  
Gas Fields ◽  
The Relationship ◽  
Drill Collar

Casing wear is one of the key issues in the development of oil and gas fields and in the process of drilling operations. In this study, the relationship between hardness and wear resistance of drill collar and casing was studied; thereby the wear conditions between the two materials were improved. Chemical analysis, optical microscopy, hardness test and friction wear test were conducted to study the effects of heat treatment on hardness of the drill collar 4145H and the casing 30Mn5V, and discuss the relationship between hardness and wear resistance of them. The results showed that the materials of drill collar and casing after different heat treatment had varying degrees of wear, both of the respective wear amounts were gradually increasing with the increase of hardness of them, the wear extent of casing material was greater than that of drill collar material. The hardness of casing material was the lowest and its wear resistance was the best when quenching at 880°C and tempering at 630°C. And when quenching at 900°C and tempering at 690°C, the hardness of drill collar material was the lowest and its wear resistance was the best. Therefore, the hardness of drill collar and casing can be improved by changing the heat treatment process to improve the wear resistance, thereby reducing the wear conditions between them.

scholarly journals Fabrication of AA7075 Hybrid Green Metal Matrix Composites by Friction Stir Processing Technique

2020 ◽  
Vol 44 (4) ◽  
pp. 295-300
Author(s):  
Sanjay Kumar ◽  
Ashish Kumar Srivastava ◽  
Rakesh Kumar Singh
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Friction Stir Processing ◽  
Research Work ◽  
Processing Technique ◽  
Matrix Composites ◽  
Avant Garde ◽  
Friction Stir ◽  
Surface Composites ◽  
Tool Tilt Angle

Friction stir processing is an avant-garde technique of producing new surface composite or changing the different properties of a material through intense, solid-state localized material plastic deformation. This change in properties depends upon the deformation formed by inserting a non-consumable revolving tool into the workpiece and travels laterally through the workpiece. This research work highlights the effect of process parameters on mechanical properties of fabricated surface composites by friction stir processing. By using various reinforcing materials like Ti, SiC, B4C, Al2O3 with waste elements like waste eggshells, rice husks, coconut shell and coir will be used to fabricate the green composites which are environmentally friendly and reduces the problem of decomposition. The parameter for this experiment is considered as the reinforcing materials, tool rotation speed and tool tilt angle. The SiC/Al2O3/Ti along with eggshell are selected asreinforcement materials. The main effect of the reinforcement is to improve mechanical properties, like hardness, impact strength and strength. The results revealed that the process parameters significantly affect the mechanical properties of friction stir processed surface composites.

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