Search results for: M. Shamanian

Items from 1 to 20 out of 103 results

article

Synthesis of Ni(Cr)–hBN Nanocomposite by Mechanical Alloying and Its Thermodynamical Evaluation

S. E. Aghili, M. Shamanian, R. Amini Najafabadi

Russian Journal of Non-Ferrous Metals > 2019 > 60 > 3 > 301-311

In the present study, the feasibility of fabricating an Ni(Cr)/hBN self-lubricating nanocomposite by mechanical alloying technique was studied. To achieve this goal, a Ni–20 wt % Cr powders mixture was first milled up to 40 h to produce the nanostructured Ni(Cr) solid solution. hBN particles were subsequently added to Ni(Cr) and further mixed for 3 h. X-ray Diffraction (XRD), Scanning Electron Microscopy...

article

Formation mechanism of intermetallic components during dissimilar diffusion bonding of IN718/BNi-2/AISI 316 L by TLP process

M. Salmaliyan, M. Shamanian

Heat and Mass Transfer > 2019 > 55 > 8 > 2083-2093

In this research, microstructure and intermetallic components of IN 718/BNi-2/316 L joint were studied. Dissimilar bonding was carried out at a temperature of 1050 ^°C and, bonding time varied at 30 and 45 min in a vacuum furnace under an approximate pressure of 10⁻⁵ mbar. After TLP joining, samples were analyzed by energy dispersive x-ray spectroscopy (EDX) and X-Ray diffraction (XRD) methods. After...

article

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

B. SADEGHI, P. CAVALIERE, M. SHAMANIAN, M. SANAYEI, more

Journal of Microscopy > 271 > 2 > 145 - 163

In the present study, Spark Plasma Sintered (SPSed) aluminium matrix composites were severely deformed through Friction stir processing (FSP). Pure aluminium powders and bimodal sized Al₂O₃ particles (80 nm and 25

μ

m) were firstly mixed by ball milling and then consolidated by spark plasma sintering. The effect of the heat input as well the bimodal particle size of the alumina on the materials’ microstructure...

article

Friction stir processing of spark plasma sintered aluminum matrix composites with bimodal micro- and nano-sized reinforcing Al2O3 particles

B. Sadeghi, M. Shamanian, F. Ashrafizadeh, P. Cavaliere, more

Journal of Manufacturing Processes > 2018 > 32 > C > 412-424

Spark plasma sintering (SPS) allowed to produce Al-based nanocomposites with 10% of Al₂O₃ particles where the ratio between nanosized and microsized particles was varied during production. The microstructural and mechanical behavior of the material after SPS was studied as a function of the reinforcement size and relative percentage. The SPSed composites were friction stir processed (FSPed), the processing...

article

High-Temperature Oxidation Behavior of Nano-structured CoNiCrAlY–YSZ Coatings Produced by HVOF Thermal Spray Technique

M. Hatami, F. Naeimi, M. Shamanian, M. Tahari

Oxidation of Metals > 2018 > 90 > 1-2 > 153-167

In this study the effects of adding yttria-stabilized zirconia (YSZ) reinforcement by mechanical milling method on the oxidation resistance of CoNiCrAlY coatings were investigated. For this purpose 0, 5, 10 and 15% YSZ were mixed with the commercial CoNiCrAlY powder and mechanically milled for 24 h in argon atmosphere. The high-velocity oxygen-fuel method was used for deposition of composite and commercial...

article

Optimization of pulsed laser welding process parameters in order to attain minimum underfill and undercut defects in thin 316L stainless steel foils

M.R. Pakmanesh, M. Shamanian

Optics & Laser Technology > 2018 > 99 > C > 30-38

In this study, the optimization of pulsed Nd:YAG laser welding parameters was done on the lap-joint of a 316L stainless steel foil with the aim of reducing weld defects through response surface methodology. For this purpose, the effects of peak power, pulse-duration, and frequency were investigated. The most important weld defects seen in this method include underfill and undercut. By presenting a...

article

Development of Ultrahigh Strength TRIP Steel Containing High Volume Fraction of Martensite and Study of the Microstructure and Tensile Behavior

I. Hajiannia, M. Shamanian, M. Atapour, E. Ghassemali, more

Transactions of the Indian Institute of Metals > 2018 > 71 > 6 > 1363-1370

A new transformation induced plasticity (TRIP) steel containing high volume fraction of martensite was produced by austempering heat treatment cycle. Microstructure and tensile properties of this TRIP steel were investigated and compared to those of a dual phase (DP) steel with high martensite volume fraction. Microstructural analysis showed a mixture of ferrite, bainite, retained austenite and about...

article

Microstructural and mechanical behavior of bimodal reinforced Al-based composites produced by spark plasma sintering and FSP

B. Sadeghi, M. Shamanian, P. Cavaliere, F. Ashrafizadeh, more

The International Journal of Advanced Manufacturing Technology > 2018 > 94 > 9-12 > 3903-3916

Spark plasma sintering (SPS) is a powder metallurgy technique where uniaxial force and pulsed direct current are employed to perform metallic or ceramic particle consolidation in very short times. The high heating and cooling rates allow to prevent excessive grain growth favoring densification. Spark plasma sintering has been recognized, in the recent past, as a very useful method to produce metal...

article

Dissimilar friction-stir lap-welding of aluminum-magnesium (AA5052) and aluminum-copper (AA2024) alloys: microstructural evolution and mechanical properties

R. Rafiei, M. Shamanian, M. H. Fathi, F. Khodabakhshi

The International Journal of Advanced Manufacturing Technology > 2018 > 94 > 9-12 > 3713-3730

In this study, feasibility of dissimilar friction-stir welding between an Al-Mg alloy (AA5052-O) and an Al-Cu alloy (AA2024-T4) in the lap joint design was assessed. After establishing a suitable working window in the moderate heat inputs in the term of rotational speed (w) and traverse velocity (v) to attain a defect-free sound dissimilar weld between these alloys, the microstructural characteristics...

article

Investigations on Dissimilar Weld of UNS S32205 DSS and ASTM A517 Steel

A. Foroughi, M. Shamanian, M. Kasiri-Asgarani, J. Kangazian

Transactions of the Indian Institute of Metals > 2018 > 71 > 3 > 533-544

In the present research, microstructure and mechanical properties of 2205 duplex stainless steel/A517 quench and tempered low alloy steel dissimilar joint were investigated. For this purpose, gas tungsten arc welding was used with ER2209 filler metal. Characterizations were conducted by optical microscopy, scanning electron microscopy equipped with an energy dispersive spectroscopy and X-ray diffraction...

article

Nd:YAG laser micro-welding of ultra-thin FeCo–V magnetic alloy: optimization of weld strength

H. MOSTAAN, M. SHAMANIAN, S. HASANI, M. SAFARI, more

Transactions of Nonferrous Metals Society of China > 2017 > 27 > 8 > 1735-1746

The main aim of this research is to optimize the tensile strength of laser welded FeCo–V alloy. A mathematical relationship was developed to predict tensile strength of the laser beam welded FeCo–V foils by incorporating process parameters such as lamping current, welding speed, pulse duration and focused position. The procedure was established to improve the weld strength and increase the productivity...

article

Structure and Properties of “Magnesium Alloy – Carbon Nanotubes” Nanocomposite and their Optimization Using Design of Experiments

M. Soltani, M. Shamanian, B. Niroumand

Metal Science and Heat Treatment > 2017 > 59 > 3-4 > 255-261

A nanocomposite obtained by introduction of carbon nanotubes into the surface layer of magnesium alloy AZ31B by the method of friction stir processing is studied. Dependences of the hardness and wear resistance on the speed of motion of the friction tool, the speed of rotation of the friction head, the number of passes of the tool and the relative content of carbon nanotubes in the layer are determined...

article

Friction stir modification of GTA 7075-T6 Al alloy weld joints: EBSD study and microstructural evolutions

M. Shamanian, H. Mostaan, M. Safari, J. A. Szpunar

Archives of Civil and Mechanical Engineering > 2017 > Vol. 17, no. 3 > 574--585

As known, mechanical properties of gas tungsten arc welded 7075 Al alloys are not desirable and some techniques should be utilized in order to refine the microstructure and hence to improve the mechanical properties of weld joints. In this research work, the microstructure of gas tungsten arc welded 7075 Al alloy was modified by friction stir processing. Evaluation of the tensile strength of the welded...

article

Influence of Al₂O₃ Nanoparticles on Microstructure and Strengthening Mechanism of Al-Based Nanocomposites Produced via Spark Plasma Sintering

B. Sadeghi, M. Shamanian, F. Ashrafizadeh, P. Cavaliere, more

Journal of Materials Engineering and Performance > 2017 > 26 > 6 > 2928-2936

Spark plasma sintering (SPS) has been recognized, in the recent past, as a very useful method to produce metal matrix composites with enhanced mechanical and wear properties. Obviously, the materials’ properties are strongly related to the reinforcement types and percentages as well as to the processing parameters employed during synthesis. The present paper examines the effect of 2 wt.% of Al₂O₃...

article

Effects of Process Parameters on the Tensile-Shear Strength of Pulsed Laser Welded Thin 316L Stainless Steel Foils

Mohammad Reza Pakmanesh, M. Shamanian

Transactions of the Indian Institute of Metals > 2017 > 70 > 9 > 2389-2398

In this research, the parameters of pulsed Nd:YAG laser welding on the lap-joint of a 316L stainless steel foil were optimized through the response surface methodology with the aim of enhancing the tensile-shear strength. For this purpose, the effects of peak power, pulse-width, and frequency were investigated. The results showed that the analysis of welding parameters in the form of a simple combination...

article

Microstructure, Tensile Properties and Work Hardening Behavior of GTA-Welded Dual-Phase Steels

H. Ashrafi, M. Shamanian, R. Emadi, N. Saeidi

Journal of Materials Engineering and Performance > 2017 > 26 > 3 > 1414-1423

In the present study, microstructure, tensile properties and work hardening behavior of a DP700 steel after gas tungsten arc welding were investigated. Formation of bainite in the fusion zone resulted in a hardness increase compared to that for the base metal (BM), whereas tempering of the pre-existing martensite in the subcritical heat-affected zone (HAZ) led to softening. The GTA-welded joint exhibited...

article

Improving tribological behavior of friction stir processed A413/SiCp surface composite using MoS2 lubricant particles

M. JANBOZORGI, M. SHAMANIAN, M. SADEGHIAN, P. SEPEHRINIA

Transactions of Nonferrous Metals Society of China > 2017 > 27 > 2 > 298-304

The effect of MoS₂ lubricant particles on the microstructure, microhardness and tribological behavior of A413/SiC_p surface composite, fabricated via friction stir processing (FSP), was studied. For this purpose, the FSP was carried out with tool rotational speed of 1600 r/min, tool travel speed of 25 mm/min and tool tilt angle of 3° through only a “single pass”. The optical and scanning electron microscopies,...

article

Examination of phase transformation kinetics during step quenching of dual phase steels

H. Ashrafi, M. Shamanian, R. Emadi, N. Saeidi

Materials Chemistry and Physics > 2017 > 187 > C > 203-217

Employing step quenching method for producing dual phase (DP) steels, kinetics of austenite to ferrite phase transformation was studied. In this regard, a series of samples were austenitized at 960 °C for 600 s. These specimens were then annealed at different intercritical temperatures, for different times between 0 and 7200 s, followed by water quenching. Detailed microstructural analysis was employed...

article

The Influence of Tool Geometry on the Mechanical Behaviour of FSSWed Al/Cu ARBed Composite

M. Shiraly, M. Shamanian, M. R. Toroghinejad, M. Ahmadi Jazani, more

Transactions of the Indian Institute of Metals > 2017 > 70 > 8 > 2205-2211

In the present study, the threaded cylindrical pin and the triangular pin were employed to friction stir spot welding of Al/Cu ARBed composite, and their influence on the material flow and mechanical properties of the spot welds were investigated. Under the same processing condition, higher temperature was measured during friction stir spot welding by using the cylindrical pin, as a result of higher...

article

A novel and simple technique for development of dual phase steels with excellent ductility

H. Ashrafi, M. Shamanian, R. Emadi, N. Saeidi

Materials Science and Engineering: A > 2017 > 680 > C > 197-202

A new and simple approach was introduced to produce dual phase (DP) steels with excellent ductility. This technique included intercritical annealing of a cold-rolled ferrite-pearlite structure followed by water quenching to produce a ferrite-martensite duplex structure, and a subsequent short intercritical annealing at a lower temperature followed by water quenching to produce the final DP steel....

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Search results for: M. Shamanian

Synthesis of Ni(Cr)–hBN Nanocomposite by Mechanical Alloying and Its Thermodynamical Evaluation

Formation mechanism of intermetallic components during dissimilar diffusion bonding of IN718/BNi-2/AISI 316 L by TLP process

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Friction stir processing of spark plasma sintered aluminum matrix composites with bimodal micro- and nano-sized reinforcing Al2O3 particles

High-Temperature Oxidation Behavior of Nano-structured CoNiCrAlY–YSZ Coatings Produced by HVOF Thermal Spray Technique

Optimization of pulsed laser welding process parameters in order to attain minimum underfill and undercut defects in thin 316L stainless steel foils

Development of Ultrahigh Strength TRIP Steel Containing High Volume Fraction of Martensite and Study of the Microstructure and Tensile Behavior

Microstructural and mechanical behavior of bimodal reinforced Al-based composites produced by spark plasma sintering and FSP

Dissimilar friction-stir lap-welding of aluminum-magnesium (AA5052) and aluminum-copper (AA2024) alloys: microstructural evolution and mechanical properties

Investigations on Dissimilar Weld of UNS S32205 DSS and ASTM A517 Steel

Nd:YAG laser micro-welding of ultra-thin FeCo–V magnetic alloy: optimization of weld strength

Structure and Properties of “Magnesium Alloy – Carbon Nanotubes” Nanocomposite and their Optimization Using Design of Experiments

Friction stir modification of GTA 7075-T6 Al alloy weld joints: EBSD study and microstructural evolutions

Influence of Al₂O₃ Nanoparticles on Microstructure and Strengthening Mechanism of Al-Based Nanocomposites Produced via Spark Plasma Sintering

Effects of Process Parameters on the Tensile-Shear Strength of Pulsed Laser Welded Thin 316L Stainless Steel Foils

Microstructure, Tensile Properties and Work Hardening Behavior of GTA-Welded Dual-Phase Steels

Improving tribological behavior of friction stir processed A413/SiCp surface composite using MoS2 lubricant particles

Examination of phase transformation kinetics during step quenching of dual phase steels

The Influence of Tool Geometry on the Mechanical Behaviour of FSSWed Al/Cu ARBed Composite

A novel and simple technique for development of dual phase steels with excellent ductility

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