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Improvement of the microstructural features and mechanical properties of advanced high-strength steel DP590 welds

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1022-1029页

作者： Arian Ghandi morteza shamanian Mohamad Reza Salmani Jalal Kangazian College of Pardis Materials Engineering SectionIsfahan University of TechnologyIsfahan 84156-83111Iran Department of Materials Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran Engineering&Quality of Auto Steel Division SAIPA GroupTehranIran

The effects of the welding current mode in resistance spot welding on the microstructure and mechanical properties of advanced high-strength steel dual-phase 590(DP590)sheets were *** showed that a rough martensitic structure was formed in the weld zone of the sample welded via the single-pulsed mode,whereas the microstructure in the heat-affected zone consisted of a very rough martensitic microstructure and rough ***,using the secondary pulse mode led to the formation of tempered martensite in the weld *** maximum load and the energy absorption to failure of the samples with the secondary pulsed cycle were higher than those of the samples with the single-pulsed *** shear results indicated that the secondary pulsed mode could significantly change the mode of failure upon shear tension ***,the obtained results suggest that the use of secondary pulsed mode can improve the microstructural feature and mechanical properties of advanced high-strength steel DP590 welds.

关键词： advanced high-strength steel resistance spot welding microstructure mechanical properties

Weldability of Ferritic Ductile Cast Iron Using Full Factorial Design of Experiment

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Journal of Iron and Steel Research International 2014年第2期21卷 252-263页

作者： Mohsen Askari-Paykani Mehrdad Shayan morteza shamanian Department of Materials Engineering Isfahan University of Technology

The weldability of a ferritic ductile cast iron was investigated as a function of different consumables and welding conditions. A 23 full factorial experimental design was used to analyze the effect of factors and their interac- tions on ultimate tensile strength of weldments. The shielded metal arc welding （SMAW） process was used with two types of consumables （E7018 and ENi-CI） under eight different conditions using as-cast samples. The microstructur- al evolution and fracture mechanisms were investigated by optical microscopy and scanning electron microscopy （SEM）, respectively. The hardness, tensile and impact tests were also performed to determine the weld quality. Based on experiment design, preheat, consumable, cooling condition, preheat cooling and preheat-consumable inter- actions were significant factors. Preheat is the most effective factor and in the case of E7018, preheat and cooling conditions were the most sensible factors. It was found that buttering was the most appropriate welding method for ferritic ductile cast iron.

关键词： ferritic ductile cast iron shielded metal arc welding weldability full factorial experimental design

Microstructure and mechanical characterization of Incoloy 825 Ni-based alloy welded to 2507 super duplex stainless steel through dissimilar friction stir welding

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Transactions of Nonferrous Metals Society of China 2019年第8期29卷 1677-1688页

作者： Jalal KANGAZIAN morteza shamanian Department of Materials Engineering Isfahan University of Technology

The feasibility of dissimilar friction stir welding(FSW)between the SAF 2507 super duplex stainless steel and the Incoloy825 Ni-based superalloy was *** microstructure and mechanical behavior of the weldments were examined *** results showed that the alloys were successfully welded together by positioning the SAF 2507 on the advancing *** nuggets displayed higher hardness than the base metals,due to the occurrence of dynamic recrystallization and the subsequent refinement of the *** welded sample obtained the similar strength to the Incoloy 825 parent metal,showing the ductile fracture mode after the tensile tests by ***,the weld zone(31 J)exhibited higher and lower toughness than the Incoloy 825(23 J)and SAF 2507(42 J)parent metals,*** on the obtained results,the FSW method could be recommended to weld the super duplex stainless steel/Ni-based superalloy joints.

关键词： friction stir welding dissimilar welds nickel stainless steel microstructure mechanical property

Structure,Texture and Magnetic Properties of Laser-Welded Ultrathin Fe-Co-V Foils

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 338-347页

作者： Hossein Mostaan morteza shamanian Seyed Mahmoud Monirvaghefi Peiman Behjati Jerzy A.Szpunar morteza Amiri Mashallah Fathi Moghadam Department of Materials Engineering Isfahan University of Technology Department of Mechanical Engineering University of Saskatchewan Department of Materials Engineering Yazd University Department of Materials Science and Engineering Sharif University of Technology

This research aims to investigate the effect of pulsed Nd：YAG laser micro-welding on the microstructure,texture and magnetic properties of ultra-thin Fe-Co-7.15 wt%V magnetic *** microscopy,scanning electron microscopy and electron backscattered diffraction techniques were used to study the microstructural ***,vibrating sample magnetometry was used to characterize the magnetic *** results showed that the fractions of low Σ coincidence site lattice boundaries in the fusion zone are higher than those of the base *** welded samples experience a significant decrease in their magnetic *** was found that the formation of new fiber texture in the fusion zone and grain coarsening are the most important factors affecting the magnetic properties.

关键词： Magnetic properties Ultra-thin magnetic foils Texture analysis EBSD study Nd:YAG laser micro-welding

Correlation Between Magnetic Properties and Allotropic Phase Transition of Fe–Co–V Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第8期28卷 1055-1058页

作者： Saeed Hasani Ali Shafyei morteza shamanian Peiman Behjati Hossein Mostaan Timu Juuti Jerzy A.Szpunar Department of Materials Engineering Isfahan University of Technology Department of Materials and Metallurgical Engineering Arak University Centre for Advanced Steels Research University of Oulu Department of Mechanical Engineering University of Saskatchewan

In this study, the allotropic phase transition and its effect on the magnetic behavior of Fe Co–7 wt%V alloy were investigated. It was found that c phase is observed in the microstructure in the as-cast condition, and it diminishes after severe cold rolling（90% reduction）. After annealing at temperatures higher than 500 up to 750 ℃, the c phase is observed in the structure, again. But, this phase is disappeared by annealing at temperatures above 750 ℃ due to the formation of vanadium-rich precipitates. Thermocalc software was used in order to elucidate the influence of vanadium percent on the stability of c phase in Fe–Co alloys. Also, magnetic studies showed that the saturation induction is reduced by annealing at temperatures from 500 up to 750 ℃, which is related to the formation of residual non-magnetic γ phase.

关键词： Fe–Co–V alloy Thermocalc software Magnetic material Phase transformation Electron backscatter diffraction(EBSD)

Microstructural and mechanical properties assessment of transient liquid phase bonding of CoCuFeMnNi high entropy alloy

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Transactions of Nonferrous Metals Society of China 2021年第10期31卷 3063-3074页

作者： Mohammad Ali KARIMI morteza shamanian Mohammad Hossein ENAYATI Department of Materials Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran

The transient liquid phase(TLP)bonding of CoCuFeMnNi high entropy alloy(HEA)was *** TLP bonding was performed using AWS BNi-2 interlayer at 1050℃ with the TLP bonding time of 20,60,180 and 240 *** effect of bonding time on the joint microstructure was characterized by SEM and *** results confirmed that complete isothermal solidification occurred approximately at 240 min of bonding *** samples bonded at 20,60 and 180 min,athermal solidification zone was formed in the bonding area which included Cr-rich boride and Mn3Si intermetallic *** all samples,theγsolid solution was formed in the isothermal solidification zone of the bonding *** evaluate the effect of TLP bonding time on mechanical properties of joints,the shear strength and micro-hardness of joints were *** results indicated a decrement of micro-hardness in the bonding zone and an increment of micro-hardness in the adjacent zone of *** minimum and maximum values of shear strength were 100 and 180 MPa for joints with the bonding time of 20 and 240 min,respectively.

关键词： high entropy alloy CoCuFeMnNi alloy transient liquid phase bonding bonding time solid solution isothermal solidification microstructure mechanical properties

Shear strength characteristics of mixing slag-stone ballast reinforcement with tire geo-scrap using large-scale direct shear tests

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Railway Engineering Science 2025年第1期33卷 94-107页

作者： morteza Esmaeili Hamidreza Heydari Maziar Mokhtari Sara Darvishi School of Railway Engineering Iran University of Science and TechnologyTehranIran

Utilizing the ballast layer with more durable and stable characteristics can help avoid significant expenses due to decreased maintenance *** the ballast layer with different types of reinforcements or substituting the stone aggregates with the appropriate granular materials could potentially help to achieve this goal by reducing the ballast *** of the exquisite and most effective solutions to eliminate these challenges is to use waste materials such as steel slag aggregates and useless *** these waste materials in the ballasted railway track will contribute to sustainable development,an eco-friendly system,and green *** in a state-of-the-art insightful,the ballast aggregates,including a mixture of steel slag and stone aggregates,are reinforced with a novel kind of geo-grid made of waste tire strips known as *** laboratory research tried to explain the shear strength behavior of the introduced mixing slag-stone ballast reinforced with tire *** achieve this goal,a series of large-scale direct shear tests were performed on the ballast which is reinforced by tire geo-scrap and included various combinations of slag and stone *** concluded results indicate that the optimal mixing ratio is attained by a combination of 75%slag and 25%stone aggregates which is reinforced by tire geo-scrap at a placing level of 120 *** this case,the shear strength,internal friction angle,vertical displacement,and dilatancy angle of stone–slag ballast reinforced with geo-scraps exhibited average changes of+28%,+9%,-28%,and-15%,respectively.

关键词： Ballast deterioration Ballast stabilization Steel slag aggregates Large-scale direct shear test Waste tire geoscrap

Visualizing traumatic brain injury:ocular clues for diagnosis and assessment

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Neural Regeneration Research 2025年第5期20卷 1399-1400页

作者： morteza Abyadeh Vivek Gupta Yuyi You Joao A.Paulo Mehdi Mirzaei ProGene Technologies Pty Ltd SydneyNSWAustralia Department of Clinical Medicine Faculty of MedicineHealth and Human SciencesMacquarie Medical SchoolMacquarie UniversityMacquarie ParkNorth RydeSydneyNSWAustralia Department of Cell Biology Harvard Medical SchoolBostonMAUSA

Traumatic brain injury (TBI) is defined as damage to the brain resulting from an external sudden physical force or shock to the *** is considered a silent public health epidemic causing significant death and disability *** were 64,000 TBI related deaths reported in the USA in 2020,with about US$76 billion in direct and indirect medical costs annually.

关键词： diagnosis ocular injury

Coalescence behaviour of water droplets in water‐oil interface under pulsatile electric fields

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Chinese Journal of Chemical Engineering 2016年第9期24卷 1147-1153页

作者： morteza Hosseini Faculty of chemical engineering Babol Noshirvani University of Technology

In this research, the deformation of water droplets in sunflower oil-interface under pulsatile electric field was studied experimentally. Three types of coalescence were observed:(i) complete coalescence,(ii) incomplete coalescence and(iii) no-coalescence. The first type is desirable because of leaving no secondary droplets. The second type that produced secondary droplets which caused by necking process, due to extreme elongation of droplets(mostly small droplets), was undesirable; because the small droplets were more difficult to coalesce and remove. The no-coalescence was caused by very fast coalescence and extensive pushing of droplet into the continuous phase. In this work the process was operated with the utilization of a batch cylindrical separator with high voltage system. The lower part of the cylinder was filled with the aqueous phase and its top part was filled with sunflower oil to form an interface between the two phases. The effects of electric field strength,frequency, and waveform types were investigated. It was found that, the ramp-ac waveform was the best waveform, avoiding the production of secondary droplets and in this case the frequency also played an important role.

关键词： Drop-interface coalescence Drops deformation Non-uniform electric field Di-electrophoresis Pulsatile electric field