A5011281989- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- Advanced materials and composites
- High Entropy Alloys Studies
- Nuclear Materials and Properties
- Corrosion Behavior and Inhibition
- Additive Manufacturing and 3D Printing Technologies
- Coal Combustion and Slurry Processing
- Metal and Thin Film Mechanics
- Metal Alloys Wear and Properties
- Subcritical and Supercritical Water Processes
- Materials Engineering and Processing
- Welding Techniques and Residual Stresses
- Hydrogen embrittlement and corrosion behaviors in metals
- Thermochemical Biomass Conversion Processes
- Intermetallics and Advanced Alloy Properties
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Manufacturing Process and Optimization
- Advanced Materials Characterization Techniques
- Surface Treatment and Coatings
- Bone Tissue Engineering Materials
- Polymer Nanocomposites and Properties
- Natural Fiber Reinforced Composites
- Magnesium Oxide Properties and Applications
University of Waterloo
2021-2024
University West
2016-2022
Tarbiat Modares University
2010-2011
Amirkabir University of Technology
2011
Abstract Power generation from renewable resources has attracted increasing attention in recent years owing to the global implementation of clean energy policies. However, such power plants suffer severe high-temperature corrosion critical components as water walls and superheater tubes. The is mainly triggered by aggressive gases like HCl, H 2 O, etc., often combination with alkali metal chlorides that are produced during fuel combustion. Employment a dense defect-free adherent coating...
Columnar grain structure typically formed along the build direction in electron beam-powder bed fusion (EB-PBF) technique leads to anisotropic physical and mechanical properties. In this study, casting solidification condition was mimicked, situ recrystallization promoted EB-PBF facilitate columnar-to-equiaxed transition Alloy 718. This is achieved via a unique linear melting strategy coupled with specific selection of process parameters EB-PBF. It found that site-specific using line order...
Successive thermal cycling (STC) during multi-track and multi-layer manufacturing of Alloy 718 using electron beam melting (EBM) process leads to a microstructure with high degree complexity. In the present study, detailed microstructural study EBM-manufactured was conducted by producing samples in shapes from one single track wall 3D maximum 10 longitudinal tracks 50 vertical layers. The relationship between STC, solidification microstructure, interdendritic segregation, phase precipitation...
Abstract High-temperature corrosion of critical components such as water walls and superheater tubes in biomass/waste-fired boilers is a major challenge. A dense defect-free thermal spray coating has been shown to be promising achieve high electrical/thermal efficiency power plants. The field spraying quality coatings have progressively evolving; therefore, assessment our understanding the efficacy increasingly aggressive operating environments plants can highly educative. effects...
There is an increasing demand to replace Co-based coatings with cheap and environmentally friendly Fe-based in corrosive environments. The main objective of this work was evaluate whether could present a better corrosion performance than coatings. Therefore, two types one type chemical compositions (in wt %) Fe-28Cr-16Ni-1.85C (FeNiCrC), Fe-17Cr-12Ni (FeNiCr), Co-28Cr-1C (CoCrC) were produced by High Velocity Air Fuel (HVAF) spraying. behavior the studied comparatively electrochemical tests...
The present study investigates the initial corrosion behaviour of HVAF-sprayed NiCr, NiAl and NiCrAlY coatings in two different environments, O2 + H2O KCl at 600 °C for up to 168 h order evaluate possibility utilizing such biomass- waste-fired boilers. SEM/EDX analysis showed that all displayed a protective H2O. Upon addition (O2 KCl), NiCr coating drastically changed as it formed thick oxide layer major chlorine diffusion down substrate. significantly better resistance with only minor...
Alloy 718 specimens manufactured via electron beam-powder bed fusion (EB-PBF) were subjected to post-processing techniques, such as thermal post-treatment and surface finishing. Hot isostatic pressing followed by solution-aging heat treatment (HIP-HT) was used the post-treatment. Surface finishing turning (TU), shot peening (SP), chemically accelerated vibratory (CAVF), electro-polishing (EP), applied on as-built HIP-HT specimens. The texture of all characterized, with specimen having...
KCl-induced high-temperature corrosion behavior of four HVAF-sprayed Ni-based coatings (Ni21Cr, Ni5Al, Ni21Cr7Al1Y and Ni21Cr9Mo) under KCl deposit has been investigated in ambient air at 600 °C up to 168 h. The were deposited onto 16Mo3 steel—a widely used boiler tube material. Uncoated substrate, 304L Sanicro 25 as reference materials the test environment. SEM/EDS XRD techniques utilized characterize as-sprayed exposed samples. results showed that small addition significantly accelerated...