Properties of Semisolid Parts: Comparison with Conventional and Innovative Manufacturing Technologies

2022 ◽  
Vol 327 ◽  
pp. 197-206
Author(s):  
Pietro Tonolini ◽  
Annalisa Pola ◽  
Lorenzo Montesano ◽  
Marialaura Tocci ◽  
Marcello Gelfi ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Microstructural Analysis ◽  
Damage Mechanism ◽  
Wear Properties ◽  
Heat Treated ◽  
Production Technologies ◽  
Manufacturing Technologies ◽  
Pin On Disk ◽  
Pressure Die Casting ◽  
The Relationship

In this paper, wear properties of samples manufactured using thixocasting were compared with those of components obtained using low-pressure die-casting and additive manufacturing in order to assess the relationship between material performance and production technologies, both conventional and innovative. The investigated items were made with AlSi7Mg alloy. First, microstructural analysis and hardness measurements were carried out. Subsequently, pin-on-disk wear tests were performed. Wear behavior of the samples was studied considering both coefficient of friction and wear rate, while the damage mechanism was analyzed by observation of the worn paths using scanning electron microscope, correlating the behavior to the specific microstructure. In addition, the effect of selected heat-treated conditions, relevant for real applications, on wear properties was also evaluated.

Sliding Wear Behavior of Remelted Al2O3-TiO2 Plasma Sprayed Coatings on Titanium

2016 ◽  
Vol 254 ◽  
pp. 231-236 ◽  
Author(s):  
Ion Dragoş Uţu ◽  
Gabriela Marginean ◽  
Iosif Hulka ◽  
Viorel Aurel Şerban
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Atmospheric Plasma ◽  
Wear Properties ◽  
Before And After ◽  
Sprayed Coating ◽  
Pin On Disk ◽  
Sprayed Coatings

Microstructure and wear properties of the Al2O3-13.wt% TiO2 thermally sprayed coatings before and after remelting were investigated in this study. The coatings were deposited on a pure titanium substrate using the atmospheric plasma spraying (APS) process. The as-sprayed coatings were electron beam (EB) modified in order to improve their compactness and bonding strength.The effect of EB remelting on the microstructure, phase constituents and wear properties was investigated using scanning electron microscopy (SEM), X-Ray diffraction technique and hardness measurements. The sliding wear behavior was tested using a pin on disk method.The results showed that the remelting process had a positive effect removing the lamellar defect of the as-sprayed coating and improving the compactness, hardness and wear behavior.

Influence of Tempering Temperature and Microstructure on Wear Properties of Low Alloy PM Steel with 1-2 % Ni Addition

2007 ◽  
Vol 534-536 ◽  
pp. 629-632
Author(s):  
Süleyman Tekeli ◽  
Ahmet Güral ◽  
Metin Gürü
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Constant Load ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Wear Coefficient ◽  
Tempering Temperature ◽  
Pin On Disk ◽  
Cold Pressed

The effect of tempering temperature and microstructure on dry sliding wear behavior of quenched and tempered PM steels was investigated. For this purpose, atomized iron powder was mixed with 0.3 % graphite and 1-2 % Ni powders. The mixed powders were cold pressed and sintered at 1200°C. The sintered specimens were quenched from 890°C and then tempered at 200°C and 600°C for 1 hr. Wear tests were carried out on the quenched+tempered specimens under dry sliding wear conditions using a pin-on-disk type machine at constant load and speed. The experimental results showed that the wear coefficient effectively increased with increasing tempering temperature. With increasing Ni content, the wear coefficient slightly decreased at all tempering temperatures due to the high amount of Ni-rich austenitic areas.

Effect of Humidity on the Friction and Wear Properties of Sn

1995 ◽  
Vol 117 (4) ◽  
pp. 737-741 ◽  
Author(s):  
Y. Imada ◽  
K. Nakajima
Keyword(s):  
Relative Humidity ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Disk Surface ◽  
Wear Loss ◽  
Wear Properties ◽  
Friction And Wear Behavior ◽  
Low Humidity ◽  
Friction And Wear Properties ◽  
Pin On Disk

Variation in friction and wear properties with relative humidity was obtained with an Sn pin sample on a Cu disk at a constant speed (0.4 m/s), load (6.4 N), and sliding distance (5 km), using a pin-on-disk apparatus. The influence of atmosphere on the tribological properties was investigated, including moisture ranging from 4% to 95 percent relative humidity (RH). It was found that the wear loss of the pin sample is very large at low humidity of around 5 percent RH, but it decreases and reaches saturation at about 50 percent RH. Factors characterizing the friction and wear at 50 percent RH were examined along with surface analysis of the disk. The results showed that the extensive transfer of Sn from pin to disk occurs during sliding and that the friction and wear behavior is determined by the friction and wear of an Sn sliding on Sn. An examination was carried out with an Sn pin sample on a stainless steel disk in comparison with an Sn-Cu couple. It was concluded that the friction and wear behavior is determined by the properties of the film transferred to the disk surface.

scholarly journals Tool Optimization of Friction Stir Processing of ZE41A Rare Earth Magnesium Alloys

2019 ◽  
Vol 8 (2) ◽  
pp. 6062-6066
Keyword(s):  
Mechanical Properties ◽  
Wear Behavior ◽  
Wear Properties ◽  
Friction Stir ◽  
Pin Geometry ◽  
Tool Tilt Angle ◽  
Pin On Disk ◽  
Tool Pin ◽  
Tool Optimization ◽  
Scanning Electron

In this study, the effect of tool pin geometry on the microstructure and mechanical properties friction stir processed (FSP) specimens of ZE41 magnesium alloy were investigated. The four different tool pin profiles such as triangular, square, taper cylindrical and threaded taper cylindrical with process parameters of 1120 RPM, 25mm/min and tool tilt angle 10 were considered. Microstructures of the processed specimens are examined using scanning electron microscope (SEM) and the wear behavior was observed using pin on disk tribometer. The consequences show that the triangular tool pin produced defect free joints, finest microstructure, higher mechanical and wear properties.

Correlation of Reinforced Ceramicparticle’s Nature and Size with Microstructure and Wear Behavior of Al-Si Alloy Composite

2012 ◽  
Vol 585 ◽  
pp. 564-568 ◽  
Author(s):  
Vipin Sharma ◽  
Suresh Kumar ◽  
O.P. Pandey
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Eutectic Silicon ◽  
Microstructural Analysis ◽  
Sand Particle ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Aluminium Matrix Composite ◽  
Zircon Sand ◽  
Sand Particles

The present study aims to analyze the effect of particle size on nature of microstructural features and wear behavior of composite. Stir casting route has been adopted for the fabrication of aluminium matrix composite using Al-Si LM13 piston alloy. Composites have been developed by varyig the size of zircon sand particles while keeping the SiC particles of same size. Microstructural analysis shows that SiC has a pronounced effect on the microstructure and eutectic silicon refinement. Microstructure evolution is mainly governed by the thermal conductivity difference between two phase’s i.e. ceramic particle and alloy matrix. The dendritic ripening is also observed in the composites in microstructural study. EDS analysis reveals the formation of mechanically mixed layer in the composites enabling better wear properties. Fine size zircon sand particle reinforced composite exhibits better wear resistance than coarse particle at same weight percentage of reinforcement. The SiC reinforcement is better as compared to zircon sand particles for enhancing wear resistance of the composite. Silicon carbide refines the eutectic silicon whereas zircon sand provides good interfacial bonding. SEM examination of worn surface and wear debris shows that the various wear mechanism are involved in material removal.

scholarly journals The effect of Sr on the microstructure and wear properties of AlSi5Cu1Mg alloy

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881953 ◽  
Author(s):  
Jianbin Zhu ◽  
Zhongmin Luo ◽  
Shuo Wu ◽  
Hong Yan
Keyword(s):  
Friction Coefficient ◽  
Energy Dispersive Spectrometer ◽  
Matrix Alloy ◽  
Wear Testing ◽  
Wear Properties ◽  
Sr Modification ◽  
The Matrix ◽  
Eutectic Si ◽  
Pin On Disk ◽  
The Relationship

The effect of different amounts (0 wt%, 0.02 wt%, 0.04 wt%, 0.06 wt%) of Sr modification on the microstructure of AlSi5Cu1Mg alloy was investigated. The wear resistances of the alloys were tested using an MMD-1 pin-on-disk wear-testing apparatus. Worn surfaces were examined using a scanning electron microscopy equipped with an energy-dispersive spectrometer. The relationship between the microstructure and wear properties of the alloy was discussed. The results show that the addition of Sr caused the grain refinement and AlSi5Cu1Mg with 0.04 wt% Sr has short rod-like Fe-rich intermetallic, minimal size of α-Al phase and secondary dendrite arm spacing, and granular or fibrous eutectic Si phase distributed uniformly at grain boundaries. Compared to the matrix alloy, the tensile strength, Brinell hardness, and elongation of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 15%, 48%, and 73%, respectively. Both the lowest friction coefficient and the best wear resistance were achieved by the AlSi5Cu1Mg with 0.04 wt% Sr. Compared to the matrix alloy, the wear mass loss and friction coefficient of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 42% and 18%, respectively. The adhesive wear and abrasive wear are the main wear mechanisms.

The Effects of Sliding Parameters on Dry Wear Characteristics of Ti-6Al-4V Alloy

2015 ◽  
Vol 1115 ◽  
pp. 213-216 ◽  
Author(s):  
Mohammed Baba Ndaliman ◽  
Katsina Christopher Bala ◽  
Ahsan Ali Khan ◽  
Mohammad Yeakub Ali ◽  
Umma Abdullahi ◽  
...  
Keyword(s):  
Wear Rate ◽  
Wear Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Wear ◽  
Wear Properties ◽  
Wear Rates ◽  
Sliding Motion ◽  
Study Results ◽  
Pin On Disk

Titanium (Ti-6Al-4V) alloy is very attractive for many applications due to its high strength-to-weight ratio and high corrosion resistance. Even then, with these attractive properties, it has poor shear strength and surface wear properties. This study is therefore undertaken to investigate the effect of sliding parameters on the surface wear behavior of Ti-6Al-4V alloy. Pin-like specimens of the alloy were produced and subjected to sliding motion on a pin-on-disk apparatus using different speeds, loads and sliding distances. The surface and specific wear rates of the alloy were evaluated as the main output of the study. Results indicate that the most severe surface wear rate of over 0.008 mm3/sec is experienced under conditions of low disk speed (50 rpm) with high input weight (46.5 N). Higher sliding distance is also found to affect the severity of the surface wear rate. All results of specific wear rates evaluated indicate that Ti-6Al-4V alloy can be classified as a low surface wear resistance material when operated under sliding counterface.

Tribological Behavior of Heat Treated Ni-rich NiTi Alloys

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
R. Aliasgarian ◽  
H. M. Ghasemi ◽  
M. Abedini
Keyword(s):  
Applied Load ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Normal Load ◽  
Sliding Speed ◽  
Niti Alloys ◽  
Ni Alloys ◽  
Heat Treated ◽  
Pin On Disk ◽  
Wear Tests

Effects of heat treatments and applied loads on the tribological behavior of Ti-56.5 wt. % Ni and Ti-57.5 wt. % Ni alloys were investigated. Wear tests were performed on a pin-on-disk tribometer under normal loads of 20 N and 60 N at a sliding speed of 0.3 m/s. The results indicated that the alloys aged at 700 °C showed lower hardness comparing to the alloys aged at 400 °C. Under an applied load of 20 N, the samples aged at 700 °C showed better wear behavior in comparison with the samples aged at 400 °C with a higher hardness. This could be attributed to higher toughness of the samples aged at 700 °C. The results also showed that the wear of the samples aged at 400 °C decreased with the increase in normal load. However, there was an increase in the wear of the samples aged at 700 °C with the increase of load. Formation and stability of tribological layers on the contacting surfaces could be the main reason for the reduction of the wear of the samples aged at 400 °C with the increase in normal load.

Wear of Ductile-Phase Toughened NiAl

1994 ◽  
Vol 364 ◽  
Author(s):  
F.E. Kennedy ◽  
I. Baker ◽  
B.J. Johnson
Keyword(s):  
Fracture Toughness ◽  
Intermetallic Compounds ◽  
Room Temperature ◽  
Wear Behavior ◽  
Heat Treatments ◽  
Material System ◽  
Ductile Phase ◽  
Pin On Disk ◽  
The Relationship

AbstractThe purpose of this work was to study the effect of ductile phases on the wear of brittle intermetallic compounds. The material system of interest was NiAl with an incorporated ductile Fe phase. Three different compositions were studied: Fe10Ni45Al45, Fe30Ni35Al35, and Fe44Ni28Al28, each after two different heat treatments. Their wear behavior in unlubricated sliding against zirconia was investigated using pin-on-disk tests at room temperature in air. Hardness and fracture toughness tests were run for the same materials to clarify the relationship between wear and deformation. Results for the ductile-phase toughened materials were compared with results of similar tests for unalloyed NiAl.

Effect of Silicon Content on Wear Behavior of Heat Treated Powder Metallurgy Steels

2013 ◽  
Vol 32 (2) ◽  
pp. 119-123
Author(s):  
Süleyman Tekeli ◽  
Ahmet Güral
Keyword(s):  
Wear Behavior ◽  
Ferrite Matrix ◽  
Constant Load ◽  
Treatment Temperature ◽  
Heat Treated ◽  
Intercritical Heat Treatment ◽  
Si Content ◽  
Ar Gas ◽  
Pin On Disk ◽  
Cold Pressed

AbstractThree different steel compositions with 1, 3 and 5 mass% Si were prepared using atomized iron (ASC.100.29) and 0.35 mass% natural graphite powders. The mixed powders were cold pressed at 700 MPa and sintered at 1200 °C for 30 min under pure Ar gas atmosphere. Some of the sintered specimens was quenched from 850 °C and then tempered at 100 °C for 1 h. The other sintered specimens were annealed at intercritical heat treatment temperature of 750 °C for 10 min and rapidly water-quenched. The experimental results showed that in as-sintered specimens inhomogeneously dispersed typical pearlitic structure in the ferrite matrix formed and its amount decreased with increasing Si content. In intercritically annealed specimens, the microstructure obtained was a mixture of partially transformed martensite and ferrite + pearlite. In quenched plus tempered specimens, beside tempered martensite, ferritic structure formed and its amount increased with increasing Si content. The wear tests were carried out under dry sliding conditions using a pin-on-disk type machine at constant load, speed and sliding distance. It was seen that, in all specimens, the friction coefficient and the wear rate both increased with increasing Si content. The increase of these values was less in the heat treated specimen than the as-sintered specimen.

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