CO2 Laser Cladding of Mild Steel Using Iron Based Powder and Silicon Carbide Particles

2013 ◽  
Vol 748 ◽  
pp. 269-272 ◽  
Author(s):  
Mum Wai Yip ◽  
Stuart Barnes
Keyword(s):  
Silicon Carbide ◽  
Continuous Wave ◽  
Matrix Material ◽  
Feed System ◽  
Reinforce Metal Matrix Composite ◽  
Melt Pool ◽  
Sic Particles ◽  
The Matrix ◽  
Iron Based ◽  
Silicon Carbide Particles

The objective of this research was to develop a new form of clad layer by producing a Silicon Carbide (SiC) particle reinforce Metal Matrix Composite (MMC) using the iron based alloys as the matrix material. A 1.2kW continuous wave CO2 laser was used in this research. A gravity feed system was used with one powder feed which contained different percentages of SiC particles and iron based powder. Experimental results showed that the decomposition of SiC particles was observed and only a few SiC particles were found in the clad matrix. High micro hardness values were found in the SiC clad which were in excess of 1000 HV. However, most of the SiC were evaporated which created porosity in the melt pool. Therefore, blown powder technique is recommended for overcome this problem.

Deposition of a Silicon Carbide Reinforced Metal Matrix Composite (P25) Layer Using CO2 Laser

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Mum Wai Yip ◽  
Stuart Barnes ◽  
Ahmed Aly Diaa Mohmmed Sarhan
Keyword(s):  
Silicon Carbide ◽  
Co2 Laser ◽  
Matrix Material ◽  
Substrate Material ◽  
Material Surface ◽  
Feed System ◽  
Sic Particles ◽  
High Microhardness ◽  
Iron Based ◽  
High Precipitation

The objective of this research was to deposit a silicon carbide (SiC) reinforced layer of P25 (iron-based matrix material) on substrate material surface using CO2 laser. Two experiments using CO2 laser were carried out in this research. In the first experiment set, a gravity feed system was used with one powder feed containing different percentages of SiC particles and iron-based powder. In the second experiment set, preplaced powder was placed on substrate material surface. According to the experimental results, only few SiC particles were found in the clad matrix in the first experiment, and no SiC particles were found in the second experiment. A high microhardness value was noted in the SiC clad (above 1000 HV) in the first experiment compared to the second experiment with hardness values ranging from 200 HV to 700 HV. This was due to the high precipitation of carbide particles in the clad material during the first experiment. A comparison of the two different experiments signifies that the first one was the best because a more uniform layer with less porosity was produced.

Effects of Laser Cladding of Silicon Carbides Particles and Iron Based Powder

2014 ◽  
Vol 548-549 ◽  
pp. 289-293 ◽  
Author(s):  
Mum Wai Yip ◽  
Stuart Barnes ◽  
Ahmed A.D. Sarhan
Keyword(s):  
Laser Cladding ◽  
Steel Substrate ◽  
Matrix Material ◽  
Base Material ◽  
Feed System ◽  
Melt Pool ◽  
Sic Particles ◽  
Direct Laser ◽  
Clad Layer ◽  
Iron Based

The objective of this study was to develop clad layer by producing a Silicon Carbide (SiC) particle reinforced Metal Matrix Composite (MMC) using the iron based alloys (P25) as the matrix material. Direct laser cladding was carried out by melting the clad materials and depositing them onto a mild steel substrate. A two gravity feed system was used in this study which contained of SiC particles and iron based powder as separate powders. The intention was to melt the iron based powder and incorporate the SiC particles. Decomposition of SiC particles was observed and only a few SiC particles were found in the clad matrix. Microhardness results showed that laser clad layer had higher hardness which more than 1000 HV and hence potentially better wear resistance that base material. However, most of the SiC had evaporated which created porosity in the melt pool due to the decomposition of SiC and the resultant gas which was trapped in clad layer did not have enough time to escape from the melt pool due to the rapid solidification. Therefore, a blown powder technique is recommended for overcome this problem.

Analysis of the Effects of Dynamic Alloying on the Structure of Aluminium and its Alloys

2021 ◽  
Vol 320 ◽  
pp. 8-13
Author(s):  
Yulia Usherenko ◽  
Viktor Mironov ◽  
Sergey Usherenko
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
High Speed ◽  
Matrix Material ◽  
Structure Change ◽  
Cosmic Dust ◽  
Structural Elements ◽  
High Speed Stream ◽  
Sic Particles ◽  
The Matrix

The dynamic alloying of aluminum and its alloy with a high-speed stream of silicon carbide (SiC) particles simulates the effect of a stream of cosmic dust on spacecraft materials. The study showed a structure change in the volume of aluminum and its alloy and the formation of new structural elements. The transformation of the structure during dynamic alloying leads to a change of the composition and mechanical properties of the matrix material.

scholarly journals Microstructural analysis of Al6063/sic with calcium additives for hardness enhancement

2018 ◽  
Vol 225 ◽  
pp. 03007
Author(s):  
Balaji Bakthavatchalam ◽  
Khairul Habib ◽  
Namdev Patil ◽  
Omar A Hussein
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Matrix Material ◽  
Microstructural Analysis ◽  
Wear Loss ◽  
Alloying Element ◽  
Silicon Phase ◽  
High Durability ◽  
The Matrix ◽  
Al6063 Alloy

Microstructural Analysis plays an important role in enhancing the mechanical properties of metals and composites. Usually Aluminium Silicon Carbide (Al6063/SiC) alloys are mixed with strontium, sodium and antimony for high durability even though they are toxic and costly. As an alternative calcium is used as an alloying element to improve the mechanical property of Al6063/Sic alloy. In this paper Al6063 is chosen as the matrix material while Sic is used as a reinforcement where calcium powder is added to modify the silicon phase of the composite. Finally, concentration of Silicon carbide is varied from 0 to 150 mg to produce four specimens of Al6063 alloy and it is subjected to microstructure analysis which showed the reduction of grain size and therefore improvement in the hardness from 52.9 HV to 58.4 HV and decrease in the wear loss from 3.97 to 3.27 percentage.

The Influence of Reinforcement Purity on Corrosion Resistance of AM50/SiC Composites

2015 ◽  
Vol 227 ◽  
pp. 43-46 ◽  
Author(s):  
Kinga Kamieniak ◽  
Marcin A. Malik
Keyword(s):  
Silicon Carbide ◽  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Matrix Alloy ◽  
Technical Grade ◽  
Magnesium Matrix Composites ◽  
Sic Particles ◽  
The Matrix ◽  
Grade Silicon ◽  
The One

The microstructure and corrosion behaviour of AM50/SiC magnesium matrix composites reinforced with SiC particles were investigated. Composites containing 10 wt. % of SiC were fabricated by means of gravity casting. Technical grade silicon carbide used for the composites fabrication was subjected to a purification procedure leading to the removal of iron containing impurities from its surface. The corrosion resistance of the composite with purified SiC particles was compared to the corrosion resistance of the one containing crude technical grade silicon carbide as well as to the corrosion resistance of the matrix alloy. Voltammetry and an electrochemical noise technique as well as hydrogen evolution rate measurements were utilized for that purpose. Corrosion tests were performed in 0.5 mol dm3 NaCl saturated with Mg (OH)2. It has been demonstrated that the composite containing purified SiC was less susceptible to corrosion than the one containing crude SiC particles. Both composites were less resistant to corrosion than their matrix itself. Regardless of a purity level of SiC which was used for the composites fabrication, the same constituents were revealed in their microstructure, namely: α-phase (a solid solution of aluminium in magnesium), fully divorced eutectic α + γ (where γ-phase is Al12Mg17), intermetallic compound Al8Mn5 and SiC particles uniformly distributed in the whole volume of the matrix.

scholarly journals Numerical Study of the Effect of the Penetration of a Crack in the Matrix of a Composite

2014 ◽  
Vol 4 (3) ◽  
pp. 649-655
Author(s):  
T. Nehari ◽  
A. Ziadi ◽  
D. Ouinas ◽  
B. Boutabout
Keyword(s):  
Silicon Carbide ◽  
Numerical Study ◽  
Temperature Gradients ◽  
The Other ◽  
Thermal Residual Stresses ◽  
Wide Range ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Aluminum Silicon Carbide ◽  
Carbide Particles

In this numerical investigation, the effect of the penetration of a crack in a matrix reinforced by aluminum silicon carbide particles in a composite is studied in order to determine the thermo-mechanical behavior under the effect of different temperature gradients during cooling. To realize this, the thermal residual stresses are calculated by considering a wide range of cracks of different penetrations. The results of this investigation compared to a case without geometric discontinuity, have revealed no meaningful effect of the distribution of the stresses along a main direction perpendicular to the direction of the crack. On the other hand, regarding the distribution of the stresses along the plane of the crack and in vicinity of the particle, results show that the penetration of the crack in the matrix causes an asymmetry.

Effect of addition of SiC particles on the Microstructure and Hardness of Al-SiC composite

10.30544/590 ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 49-56
Author(s):  
Hareesha G ◽  
N Chikkanna ◽  
Saleemsab Doddamani ◽  
Anilkumar S Kallimani
Keyword(s):  
Silicon Carbide ◽  
Stir Casting ◽  
Age Hardening ◽  
Particulate Composites ◽  
Matrix Composites ◽  
Hardness Testing ◽  
Casting Technique ◽  
Sic Particles ◽  
The Matrix ◽  
Aluminum Silicon Carbide

This work aims to investigate the effect of the addition of silicon carbide particles on the microstructure and the hardness of the Al-SiC metal matrix composites. The said composite is prepared using the stir casting technique for different weight percentages of the SiC particles. The higher composition of the reinforcement causes the clustering of the particles in the matrix. Thus, research has to be carried out on the aluminum-silicon carbide composites with the reinforcement 3wt%, 6wt%, 9wt%, and 12wt% of SiC particles to obtain the optimized composition. In order to study the microstructure and the reinforcement distribution in the matrix, a scanning electron microscope is utilized. The hardness testing has been carried out using the Vickers’ indentation technique for the as-cast and age hardening conditions. From the microstructural study, it is observed that the microstructure of the said composite exhibits the uniform distribution of the reinforcement. The EDX results show the presence of the reinforcing elements in the Al-SiC composite. From the results obtained from the hardness testing, it is observed that the presence of the carbide element in the composite increases the hardness of the Al-SiC particulate composites.

Structure Investigation of Ball Milled Composite Powder Based on AlSi5Cu2 Alloy Chips Modified by Sic Particles

2013 ◽  
Vol 58 (2) ◽  
pp. 437-441 ◽  
Author(s):  
M. Śusniak ◽  
J. Karwan-Baczewska ◽  
J. Dutkiewicz ◽  
M. Actis Grande ◽  
M. Rosso
Keyword(s):  
Silicon Carbide ◽  
Processing Time ◽  
Composite Powder ◽  
Homogeneous Distribution ◽  
Carbide Powder ◽  
Sic Particles ◽  
Aluminum Chips ◽  
The Matrix ◽  
Aluminum Solid Solution ◽  
Average Size

The paper is focused on the processing of aluminum alloy chips using powder metallurgy. Chips obtained from recycled AlSi5Cu2 alloy were ball milled with the addition of silicon carbide powder with an average size of 2μm. Mechanical alloying process was employed to obtain homogeneous composite powder. The effect of processing time (0 - 40h) on the homogeneity of the system was evaluated, as well as a detailed study of the microstructure of AlSi5Cu2 aluminum chips and SiC particles during MA was carried out. Addition of silicon carbide (10, 20wt%) to recycled aluminium chips and application of MA lead to fragmentation of the homogeneous composite powder down to particle size of about 3μm and spheroidization. The addition of hard SiC particles caused reinforcement and reduced the milling time. Higher content of silicon carbide and longer processing time allowed to obtain AlSi5Cu2/SiC powders with microhardness ∽500HV0,025. The results of MA were investigated with SEM, EDS, LOM, XRD and showed that relatively homogeneous distribution of SiC reinforcements in the matrix as well as grain refinement of aluminum solid solution down to 50nm can be obtained after 40h of processing.

Internal Stress in an Alumina/Silicon Carbide Whisker Composite

1995 ◽  
Vol 39 ◽  
pp. 391-403
Author(s):  
M. Oden ◽  
T. Ericsson ◽  
J. B. Cohen
Keyword(s):  
Silicon Carbide ◽  
Stress State ◽  
Internal Stress ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eshelby Model ◽  
The Matrix ◽  
Silicon Carbide Particles

The internal stress state in a Al2O3-SiC composite has been studied with X-ray diffraction and with calculations with a modified Eshelby model. The influence (on the internal stress state) of volume fraction, temperature, geometric shape, and the orientation of the silicon carbide particles are discussed. The stress tensors were measured in both the matrix and in the reinforcing phase, and the macro- and microstresses were separated for ail the components. Good agreement with the microstresses for the Eshelby model is found in all cases.Results from X-ray diffraction experiments at low temperature (45-295 K) on the coefficient of thermal expansion are also presented.

The Production of Cast Metal Matrix Composite by a Modified Stir Casting Method

2012 ◽  
Author(s):  
Jasmi Hashim
Keyword(s):  
Silicon Carbide ◽  
Tensile Strength ◽  
Metal Matrix Composite ◽  
Metal Matrix ◽  
Matrix Alloy ◽  
Stir Casting ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Particle Addition

Dalam praktik biasa teknik tuangan kacau, komposit matriks logam dihasilkan dengan cara meleburkan bahan matriks dalam suatu bekas kemudiannya leburan logam ini dikacau dengan kuat untuk membentuk vorteks dan bahan tetulang partikel dimasukkan melalui bahagian tepi vorteks yang telah terbentuk. Daripada satu sudut pandangan pendekatan ini mempunyai kekurangan, yang timbul daripada kaedah memasukkan partikel dan kaedah pengacuan. Semasa penambahan partikel ini dilakukan akan berlaku pemejalan setempat dalam leburan tersebut yang teraruh oleh partikel, dan ini akan meningkatkan kelikatan buburan tersebut. Kaedah penambahan partikel melalui bahagian atas ini juga akan memasukkan udara ke dalam buburan yang muncul sebagai poket udara di antara partikel tersebut. Kadar penambahan partikel ini juga perlu diperlahankan terutamanya apabila terdapat peningkatan pecahan isipadu partikel yang digunakan. Proses ini akan memakan masa yang lama terutamanya untuk produk yang lebih besar. Kajian ini mencadangkan satu pendekatan baru untuk menghasilkan tuangan MMC. Apabila semua bahan dimasukkan ke dalam mengkok grafit dan dipanaskan dalam atmosfera lengai sehingga aloi matriks menjadi lebur dan kemudiannya diikuti dengan tindakan kacauan dua-langkap sebelum penuangan ke dalam acuan, mempunyai kelebihan daripada segi menggalakkan kebolehbasahan di antara partikel silikon karbida dengan aloi A359 aloi matriks. Kejayaan penambahan partikel silikon karbida ke dalam aloi matriks telah menunjukkan bahawa kebolehbasahan di antara partikel silikon karbida, dan sifat mekanikal seperti kekerasan dan kekuatan tegangan adalah setanding dengan data sebelumnya yang dihasilkan oleh penyelidik lain. Kata kunci: Komposit matriks logam; tuangan kacau; kebolehbasahan; kekerasan; kekuatan; penyebaran partikel In a normal practice of stir casting technique, cast metal matrix composites (MMC) is produced by melting the matrix material in a vessel, then the molten metal is stirred thoroughly to from a vortex and the reinforcement particles are introduced through the side of the vortex formed. From some point of view this approach has disadvantages, mainly arising from the particle addition and the stirring methods. During particle addition there is undoubtedly local solidification of the melt induced by the particles, and this increase the viscosity of the slurry. A top addition method also will introduced air into the slurry which appears as air pockets between the particles. The rate of particle addition also needs to be slowed down especially when the volume fraction of the particles to be used increases. This is time consuming for a bigger product. This study propose a new approach of producing cast MMC. When all substances are placed in a graphite crucible and heated in an inert atmosphere until the matrix alloy is melted and then followed by a two–step stirring action before pouring into a mould has advantages in terms of promoting wettability between the silicon carbide particle and the A359 matrix alloy. The success of the incorporation of silicon carbide particles into the matrix alloy showed that the wettability between silicon carbide particles and mechanical properties such as hardness and tensile strength are comparable with previous data produced by other researchers. Keywords: Metal matrix composite; stir casting; wettability; hardness; tensile strength; particle distribution.

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