Late News Poster Session: Materials Processing
Program Organizers: TMS Administration
Monday 5:30 PM
February 28, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center
F-34: A Study on the Role of Crystal Shape on the Freeze-lining Growth and Stability: Gaëlle Butin1; Lennart Scheunis2; Bart Blanpain1; Annelies Malfliet1; 1KU Leuven; 2Umicore
Freeze-linings are used in high-temperature metallurgical processes to protect the walls from the aggressivity of the molten slags. They are composed of amorphous and/or crystalline phases, whose composition and assemblage depend on the process characteristics, such as the slag primary phase field and the applied cooling rate. In this study, we investigated the role of olivine, spinel and melilite properties on the stability of freeze-linings formed in the Fe-Al-Ca-Si-O slag system. Data were collected from literature, from the software FactSage, and from freeze-lining experiments done with a gas-cooled probe and a vertical tube furnace. By analyzing the microstructure and chemical composition of the samples with SEM, EPMA and XRD, we determined the impact of the type of crystal on the freeze-lining structure and on the properties of the boundary layer at the freeze-lining and slag interface, and therefore on the overall freeze-lining interactions with the molten bath.
F-36: Development of Austenitic Stainless Steel with TWIP Effect: Pavel Podany1; Tomas Studecky1; Radek Prochazka1; 1COMTES FHT
The article deals with the description of the development of austenitic steel with TWIP effect which is alloyed with chromium to increase corrosion resistance. The experimetal heats of this steel were cast in an experimental melting furnace and subsequently subjected to hot and cold rolling. After cold rolling, the appropriate recrystallization annealing temperature was experimentally determined to obtain the optimal austenitic grain size. X-ray deffraction proved that all melts contain a fully austenitic structure. After recrystallization annealing, the sheets reach a TS of more than 950 MPa with an elongation of more than 40 %. Thanks to the addition of chromium, the corrosion resistance of this steel is comparable to the basic grades of ferritic stainless steels.
F-37: Effect of Modifiers on Charge Dissipation and Properties of Electrosprayed Melting Gels: Kelly Hughes1; Michael Grzenda1; Alfusainey Samateh2; Andrei Jitianu2; Jonathan Singer1; 1Rutgers University; 2City University of New York
Melting gels are a class of hybrid organic-inorganic, silica-based gels which are solid below their glass transition temperatures, near room temperature, but show thermoplastic behavior when heated. While this phase change can be repeated multiple times, heating the gel past its consolidation temperature initiates an irreversible reaction that produces highly crosslinked organic-inorganic glasses. This thermoplastic-to-thermoset ability makes melting gels uniquely compatible with processing techniques inaccessible to other gels. However, melting gel consolidation reactions are highly dependent on charge interactions. Here we use electrospray deposition (ESD) of melting gels with different modifiers to reduce and enhance charge removal by mass transport to see how the charge affects film morphology, consolidation chemistry, and surface properties. Microscopy, film thickness measurements, water contact angle, and Fourier transform infrared spectroscopy were used to characterize the sprayed melting gel composites.
F-40: Enhancing Mechanical Properties of Molybdenum with Equal Channel Angular Extrusion Processing: Ekaterina Maynor1; David Foley2; James Paramore1; Kelvin Xie1; Brady Butler1; 1Texas A&M University; 2Shear Form, Inc.
Molybdenum metal is known for having many attractive properties including high thermal conductivity and low coefficient of thermal expansion. Deformation processing helps to increase strength and hardness of metals; however, it has also been shown that cold working can reduce the ductile-to-brittle transition temperature (DBTT) in certain body centered cubic refractory metals. To improve mechanical characteristics of the material, pure Molybdenum was processed with equal channel angular extrusion (ECAE). Three passes of route-A extrusions (i.e., encapsulated bars were not rotated between passes) were used in this study. The processing temperature ranged from 300oC to 450oC. Miniaturized tensile tests were used to assess the mechanical performance and the results are discussed in terms of material texture and grain refinement.
F-41: From Long-term Aging to Rapid Annealing – The Heat Treatment Optimization of Melt-spun Fe81Ni4Cu1B14 Alloy. Crystal Structure and Magnetic Properties Evolution: Lukasz Hawelek1; Tymon Warski1; Marcin Polak1; Adam Pilsniak1; Magdalena Steczkowska-Kempka1; Anna Wojcik2; Aleksandra Kolano-Burian1; 1Lukasiewicz Research Network - Institute of Non-Ferrous Metals; 2Institute of Metallurgy and Materials Science Polish Academy of Sciences
In this work, the annealing process of the amorphous melt-spun Fe81Ni4Cu1B14 alloy has been optimized in the wide range of heat treatment time (from seconds to tens of hours) and temperatures to find the best magnetic properties (the lowest value of the core power losses and the highest saturation induction). The magnetic properties (saturation induction, coercivity, core power losses and complex magnetic permeability) have been investigated on the wound toroidal cores and then correlated with crystal structure evolution studied via X-ray diffraction method and transmission electron microscopy observations. This holistic approach allowed determining optimal parameters of the heat treatment process in a wide range of time and temperature, enabling the continuous combination of different types of heat treatment (long-term aging, classical annealing and rapid annealing).
NOW ON-DEMAND ONLY: F-42: Study of the Sub-surface Thermal and Plastic Strain Distribution during Laser Shock Peening of Aerospace Grade Alloys – Simulation and Experiments: Ayan Bhowmik1; Varad Choudhari1; Niroj Maharjan2; 1Indian Institute of Technology Delhi; 2Advanced Remanufacturing and Technology Centre
Laser shock peening produces compressive stresses deep below the metallic surface thereby improving fatigue and corrosion lives of structural components. Laser shock peening, is essentially a mechanical peening process and by the virtue being carried out in a submerged medium with protective overlay, does not induce significant thermal effects on specimens. However, high strain rates due to laser impingement could be accompanied by a temperature rise in sub-surface regions. In this work we conduct combined experimental and simulation-based investigation to understand the individual effect of plastic strain due to shock wave-deformation and any possible accompanying sub-surface thermal effects We choose Ti- and Ni-based alloys, both of which are used extensively in the aerospace sector. The distribution and effect of thermal field would be assessed using physics-based model simulations and the microstructural signature of the thermal and strain fields is validated through experimental characterisation of the structure at appropriate length scales.
F-43: X-ray Decomposition of PET Nanoparticles as an Alternative Process to Decontaminate Water Resources: Leonardo Batista Capaverde Silva1; J.V Rojas2; Maria C Molina Higgins1; 1The Pennsylvania State University; 2Virginia Commonwealth University
Micro and nanoplastics possess significant risk to living organisms. Thus, new materials processing strategies are needed to mitigate the side effects of plastics in the environment. In this work, radiation-induced degradation of nanoplastics is presented as an alternative to decrease the concentration of fragmented plastics in water. To gain insight into different degradation pathways of plastics, polyethylene terephthalate (PET) particles are irradiated using x-rays with doses ranging from 180-550 kGy. Results indicate that PET nanoplastics undergo a reduction in size of 23% at 550 kGy. XPS Results indicate a decrease in the amount of C=O bonds, and in the overall C content. Plastic degradation is due to chain scissions caused by reactive species such as OH radicals produced during water radiolysis. Overall, this work will provide alternatives for plastic pollution mitigation, aiming to improve the quality of aquatic ecosystems and safe access to water resources for human consumption.