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Authors = Hossein Besharatloo ORCID = 0000-0003-2942-8206

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16 pages, 2960 KiB  
Article
Investigating the Effect of Nanosecond Laser Surface Texturing on Microstructure and Mechanical Properties of AISI 301LN
by Mohammad Rezayat, Hossein Besharatloo and Antonio Mateo
Metals 2023, 13(12), 2021; https://doi.org/10.3390/met13122021 - 17 Dec 2023
Cited by 8 | Viewed by 2796
Abstract
This study explores pulsed Nd:YLF laser surface modification (LSM) effects on AISI 301LN stainless steel. Laser-treated surfaces underwent SEM characterization, revealing patterns and irregularities. Higher heat input surfaces showed significant microstructural changes, while lower heat input surfaces experienced less alteration. Increased laser spot [...] Read more.
This study explores pulsed Nd:YLF laser surface modification (LSM) effects on AISI 301LN stainless steel. Laser-treated surfaces underwent SEM characterization, revealing patterns and irregularities. Higher heat input surfaces showed significant microstructural changes, while lower heat input surfaces experienced less alteration. Increased laser spot overlap led to larger exposed areas and higher heat input, influencing groove width, depth, and surface roughness. Three-dimensional reconstructions illustrated the correlation between laser parameters and surface characteristics. XRD (X-ray diffraction analysis) and EBSD (Electron backscatter diffraction) analyses revealed a transformation from austenite to martensite, with an increase in the α’-martensite phase, particularly in patterns with high laser power, attributed to rapid cooling during laser modification. Grain size analysis indicated a 42% reduction post-treatment, enhancing the surface fraction of fine grains. Hardness measurements demonstrated an overall increase in laser-treated samples, linked to fine-grained microstructure formation, induced residual stresses, and the α’-martensitic phase. Full article
(This article belongs to the Section Metal Failure Analysis)
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12 pages, 5073 KiB  
Article
Microstructural and Mechanical Characterization of Colloidal Processed WC/(W5Vol%Ni) via Spark Plasma Sintering
by Ahmed-Ameur Zegai, Hossein Besharatloo, Pablo Ortega, Boubekeur Djerdjare, Begoña Ferrari and Antonio Javier Sanchez-Herencia
Materials 2023, 16(13), 4584; https://doi.org/10.3390/ma16134584 - 25 Jun 2023
Cited by 3 | Viewed by 1500
Abstract
This study investigates the sintering behaviour and properties of WC-based composites in which WC was mixed with W5vol%Ni in concentrations of 10vol% and 20vol%. Colloidal processing in water and spark plasma sintering were employed to disperse the WC particles and facilitate sintering. The [...] Read more.
This study investigates the sintering behaviour and properties of WC-based composites in which WC was mixed with W5vol%Ni in concentrations of 10vol% and 20vol%. Colloidal processing in water and spark plasma sintering were employed to disperse the WC particles and facilitate sintering. The addition of W5vol%Ni improved the sintering process, as evident from a lower onset temperature of shrinkage determined through dilatometric studies. All samples exhibited the formation of tungsten monocarbide (W2C), with a more pronounced presence in the WC/20(W5vol%Ni) composite. Sintering reached its maximum rate at 1550 °C and was completed at 1600 °C, resulting in a final density exceeding 99.8%. X-ray diffraction analysis confirmed the detection of WC and W2C phases after sintering. The observed WC content was higher than expected, which may be attributed to carbon diffusion during the process. Macro-scale mechanical characterisations revealed that the WC/10(W5vol%Ni) composite exhibited a hardness of 18.9 GPa, while the WC/20(W5vol%Ni) composite demonstrated a hardness of 18.3 GPa. Increasing the W5vol%Ni binder content caused a decrease in mechanical properties due to the formation of W2C phases. This study provides valuable insights into the sintering behavior and properties of WC/W5vol%Ni composites, offering potential applications in extreme environments. Full article
(This article belongs to the Special Issue The 15th Anniversary of Materials—Recent Advances in Materials Physics)
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16 pages, 3030 KiB  
Article
Effect of Lateral Laser-Cladding Process on the Corrosion Performance of Inconel 625
by Mohammad Rezayat, Amirhossein Aboutorabi Sani, Mohammad Talafi Noghani, Morteza Saghafi Yazdi, Morteza Taheri, Amirhossein Moghanian, Mohammad Abedini Mohammadi, Mahmoud Moradi, Antonio Manuel Mateo García and Hossein Besharatloo
Metals 2023, 13(2), 367; https://doi.org/10.3390/met13020367 - 11 Feb 2023
Cited by 34 | Viewed by 3961
Abstract
This study aimed to evaluate the corrosion properties of different samples coated by the laser-cladding method to find the optimal laser parameters. Thereby, potentiodynamic polarization (Tafel) and electrochemical impedance tests were performed to assess the corrosion resistance of coated samples. Consequently, the corrosion [...] Read more.
This study aimed to evaluate the corrosion properties of different samples coated by the laser-cladding method to find the optimal laser parameters. Thereby, potentiodynamic polarization (Tafel) and electrochemical impedance tests were performed to assess the corrosion resistance of coated samples. Consequently, the corrosion morphology of tested samples was inspected by scanning electron microscopy. The results demonstrated that the laser power directly correlates with pitting corrosion and defects on the surface of the samples. Moreover, when molybdenum and chromium ions are increased in the electrolyte solution, the passive and protective layers are more durable, as the ions are sited within the holes and defects, reducing the surface corrosion rate. Full article
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15 pages, 6678 KiB  
Article
Novel Mechanical Characterization of Austenite and Ferrite Phases within Duplex Stainless Steel
by Hossein Besharatloo, Marcel Carpio, José-María Cabrera, Antonio Manuel Mateo, Gemma Fargas, Jeffrey Martin Wheeler, Joan Josep Roa and Luis Llanes
Metals 2020, 10(10), 1352; https://doi.org/10.3390/met10101352 - 10 Oct 2020
Cited by 33 | Viewed by 4693
Abstract
The microstructure and micromechanical properties of the constitutive phases of a particular duplex stainless steel in various processing conditions have been characterized. Hardness (H), elastic modulus (E) and H/E cartography maps were obtained by using a high-speed [...] Read more.
The microstructure and micromechanical properties of the constitutive phases of a particular duplex stainless steel in various processing conditions have been characterized. Hardness (H), elastic modulus (E) and H/E cartography maps were obtained by using a high-speed nanoindentation mapping technique. Small-scale H and E evolution at different processing conditions has been investigated by statistical analysis of a large number of nanoindentations (10,000 imprints per sample). Two mechanically distinct phases, ferrite (α) and austenite (γ), were deconvoluted from this dataset using Ulm and Constantinides’ method, with the remaining values assigned to a third mechanical phase linked to composite-like (containing α/γ interphase boundaries) regions. These mechanical property phase assessments were supplemented by overlaying crystallographic phase maps obtained by electron backscattered diffraction. An excellent correlation between microstructure and small-scale mechanical properties was achieved, especially when considering the ratio H/E. Full article
(This article belongs to the Special Issue Mechanical Properties of Deformed Alloys and Compounds)
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