A5001551997- Shape Memory Alloy Transformations
- Microstructure and Mechanical Properties of Steels
- Intermetallics and Advanced Alloy Properties
- Advanced Welding Techniques Analysis
- High-Temperature Coating Behaviors
- Metal Alloys Wear and Properties
- Advancements in Solid Oxide Fuel Cells
- Tribology and Wear Analysis
- Concrete and Cement Materials Research
- Concrete Corrosion and Durability
- Aluminum Alloys Composites Properties
- Metallurgical and Alloy Processes
- Magnesium Alloys: Properties and Applications
- Corrosion Behavior and Inhibition
- Material Science and Thermodynamics
- Aluminum Alloy Microstructure Properties
- High Entropy Alloys Studies
- Brake Systems and Friction Analysis
- Nuclear Materials and Properties
- Surface Treatment and Residual Stress
- Metallic Glasses and Amorphous Alloys
Gheorghe Asachi Technical University of Iași
2022-2025
The high yttria content of a stabilized zirconia (YSZ) (38 wt% Y2O3) coating was deposited by atmospheric plasma spraying (APS) from Metco 207 powders on an Inconel 718 (Ni-based superalloy) substrate. As metal connection, layer cermet powder (Ni-20% Al—410NS) used before the ceramic deposition. electro-chemical corrosion resistance these materials tested using cylinders with diameter 10 mm and thickness 1 mm, without layer. Linear cyclic measurements were obtained in H2SO4 electrolyte media...
A new functional Fe-30Mn-5Si-xCu (x = 1.5 and 2 wt%) biomaterial was obtained from the levitation induction melting process evaluated as a biodegradable material. The degradation characteristics were assessed in vitro using immersion tests simulated body fluid (SBF) at 37 ± 1 °C, evaluating mass loss, pH variation that occurred solution, open circuit potential (OCP), linear cyclic potentiometry (LP CP), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) nano-FTIR. To...
A shape memory alloy with the chemical composition Fe-14Mn-6Si-9Cr-5Ni (mass %) was produced by powder metallurgy (PM) from as-blended powders mixed mechanically alloyed (MA’ed) volumes in amounts of 0, 10 and 20. After blending, pressing sintering, specimens were hot-rolled, spark erosion cut different configurations solution-treated between 700 1100 °C. metallographic preparation, structural analyses performed X-ray diffraction microscopic observation optical scanning electron microscopy...
Stainless steels have many practical applications requiring various mechanical or chemical demands in the working environment. By optimizing a device used experiments for torsional loading, several cylindrical samples were tested (both ends twisted with same torque value opposite directions) of 316L stainless steel (SS) to evaluate changes structural, chemical, and characteristics. Initially, experimental pre-loaded by tension elastic range (6%) then subjected torsion (772°) at different...
The paper analyzes the occurrence of evenly spaced cracks on surface lamellar specimens Fe-28Mn-6Si-5Cr (mass %) shape-memory alloy (SMA), during cold rolling. were hot rolled and normalized developed rolling with an approximate spacing about 1.3 mm a depth that increased thickness-reduction degree. At specimens, X-ray diffraction patterns revealed presence multiple crystallographic variants brittle α′ body-bcc martensite, which could be cause cold-rolling cracking. Both cold-rolled analyzed...
This paper carries out a study on the microstructural characteristics and mechanical properties of phosphate layers deposited steel reinforcements for civil constructions. Analyses were performed 4 sets samples: 1 control sample (unphosphated) 2–4 samples that phosphated with three different solutions. The structural chemical analysis, as well examination (surface roughness, microindentation, scratch resistance) rebars constructions, was carried out. following conclusions drawn from...
An usual material, EN-GJL-250 cast iron, used for automotive braking systems, was covered with a ceramic material (105NS-1 aluminium oxide) using an industrial deposition system (Sulzer Metco). The main reason to improve the corrosion and wear (friction) resistance properties of cast-iron. Samples were prepared by mechanical grinding sandblasting before deposition. We applied two four passes (around 12-15 µm layer) each at 90° obtaining coatings 30 respectively 60 µm. surface samples (with...
We developed and analyzed a novel non-sparking material based on CuAlBe for applications in potentially explosive environments. Using master alloy of CuBe, an established anti-sparking tools used oil fields, mines, or areas with gas accumulations, pure Al, we Ar atmosphere induction furnace to obtain ~10 wt% Al ~2 Be percentages good chemical structural homogeneity. The new was tested gaseous mixture (10% H2 6.5% CH4) under extremely strong wear 16,000 cycles, no hot sparks capable igniting...
A new non-sparking metallic material, Cu-Ti, with applications in potentially explosive environments is proposed as an alternative to CuBe, reduce the processing and toxic effects of Be. Using high-purity Cu Ti materials, a (~3–4 wt%) alloy good chemical structural homogeneity was fabricated induction furnace under Ar atmosphere. The hot-rolled material tested gas mixture (10% H2 or 6.5% CH4) extremely severe wear tests for 15,000 cycles, no hot sparks were produced ignite medium....