Hassan Farhangi
University of Tehran
Composite numberUltimate tensile strengthBrittlenessComposite materialTensile testingParticle sizeMetallurgyMaterials scienceWeldingSuperalloyScanning electron microscopeTearingMetallographyInvestment castingExtrusionAustenitic stainless steelAlloyResidual stressFracture (geology)FractographyAluminiumDuctilityPorosityStructural engineeringEquiaxed crystalsMicrostructureStress (mechanics)Nanocomposite
52Publications
11H-index
462Citations
Publications 28
Newest
#1Hossain Ebrahimzadeh (UT: University of Tehran)H-Index: 1
Last. Seyed Ali MousaviH-Index: 11
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Due to high hot crack susceptibility of Al-Mg-Si alloys, autogenous welding by rectangular pulsed laser beam has not been generally successful in the removal of cracks. In this research, the effect of pulsed Nd:YAG laser parameters and preheating on the creation of hot cracks in the 6061-T6 aluminum alloy was investigated. The sample that was fabricated by the laser parameters including 1 Hz, 0.12 mm/s, 10 ms, and without preheating exhibited the highest cooling rate and the smallest dendrite ar...
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#1Hossain Ebrahimzadeh (UT: University of Tehran)H-Index: 1
#2Hassan Farhangi (UT: University of Tehran)H-Index: 11
Last. Arman Ghahramani (UT: University of Tehran)H-Index: 1
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Revealing grains and very fine dendrites in a solidified weld metal of aluminum-magnesium-silicon alloys is difficult and thus, there is no evidence to validate the micro- and meso-scale physical models for hot cracks. In this research, the effect of preheating on the microstructure and hot crack creation in the pulsed laser welding of AA 6061 was investigated by an optical microscope and field emission electron microscopy. Etching was carried out in the gas phase using fresh Keller’s reagent fo...
1 CitationsSource
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1 CitationsSource
#1Mahmood SameezadehH-Index: 3
#2Masoud Emamy (UT: University of Tehran)H-Index: 11
Last. Hassan FarhangiH-Index: 11
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Nanocomposites of 2024 aluminum–MoSi2 were prepared using mechanical alloying method followed by cold and hot pressing. Influences of volume fraction and distribution of nanosized MoSi2 reinforcement on mechanical properties of the composites were investigated. Microstructural characterization was carried out by scanning electron microscopy and energy dispersive spectroscopy. Mechanical properties of the nanocomposites were evaluated via hardness, wear, and also room and high temperature compres...
4 CitationsSource
#1Mahmood Sameezadeh (Shahid Beheshti University)H-Index: 3
#2Hassan Farhangi (UT: University of Tehran)H-Index: 11
Last. Massoud Emamy (UT: University of Tehran)H-Index: 32
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Nanocomposites of AA 2024 aluminum alloy matrix reinforced with nano-sized MoSi2 particles were produced using mechanical alloying method followed by cold and hot pressing. Phase stability analysis, hardness, and room temperature compression tests of the composites were performed. In addition, absorb energy calculation and fracture behavior evaluation of the compression test specimens were carried out. The results indicated that the composite constituents exhibit good stability during the high t...
2 CitationsSource
#1Sadreddin Baharnezhad (IAU: Islamic Azad University)H-Index: 1
#2Hassan Farhangi (UT: University of Tehran)H-Index: 11
Last. Ali Ammari Allahyari (UT: University of Tehran)H-Index: 2
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This work aimed to study the effect of various geometric parameters on bending behavior in orthopedic dynamic compression plates (DCPs) in order to achieve suitable criteria in an optimum design of these plates. Modeling, simulation, and analysis were performed through the finite element software of ABAQUS. In order to verify the model, four-point bending tests on several actual plates were conducted. In addition, the classical beam theory was applied for the theoretical estimation of the maximu...
2 CitationsSource
May 6, 2013 in ISAAC (International Symposium on Algorithms and Computation)
#1Ali Ammari Allahyari (UT: University of Tehran)H-Index: 2
#2Hassan Farhangi (UT: University of Tehran)H-Index: 11
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The effects of isothermal aging at temperatures between 550-850 ?C for durations of 1-100 h on microstructure, tensile properties, and impact fracture behavior of 316L austenitic stainless steel weld metal have been investigated. For this purpose, various techniques including metallographic observations, measurement of ferrite content using ferritscope, and fractographic investigations have been utilized. It was found that increasing aging temperature and time lead to dissolution of delta ferrit...
Apr 27, 2013 in ISAAC (International Symposium on Algorithms and Computation)
#1Amir Pakdel (National Institute for Materials Science)H-Index: 19
Last. Mohammad Habibi Parsa (UT: University of Tehran)H-Index: 25
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Al-SiC composites are among the most demanding metal matrix composites due to their excellent strength, good ductility, good corrosion resistance, low coefficient of thermal expansion and reasonable price. Manufacturing of cast metal matrix composites usually involves some problems such as inhomogeneous distribution of the particles due to poor wetability of ceramics to molten alloys, porosity and formation of particle-void clusters. Thus it seems necessary to utilize secondary processes for the...
#1Mahmood Sameezadeh (UT: University of Tehran)H-Index: 3
#2Hassan Farhangi (UT: University of Tehran)H-Index: 11
Last. Massoud Emamy (UT: University of Tehran)H-Index: 25
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Nano-sized MoSi2 powder was produced successfully from commercially available MoSi2 by a mechanical milling process carried out for 100 h, and mechanical alloying was employed to synthesize AA 2024-MoSi2 nanocomposites. The effects of MoSi2 reinforcement and mechanical milling on the structure, morphology, and iron contamination of the produced materials were investigated using X-ray diffraction, scanning electron microscopy, and atomic absorption spectrometry. It is revealed that the morphology...
5 CitationsSource
#1Mahmood SameezadehH-Index: 3
#2Hassan FarhangiH-Index: 11
Critical gas turbine rotating component, such as turbine blades, compressor disks, spacers and cooling fan blades are subjected to cyclic stresses during engine start-up, operation and shut-down. The lifetime of these components are usually established on the basis of probabilistic crack initiation criterion for a known fracture-critical location (Koul & Dainty, 1992). Therefore, periodic inspections are carried out to detect the probable cracks and prevent suddenly fractures.
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