Comparative Wear Evaluation of Pure Zn, Zn–Mg and Zn–Mg–Y Alloys Using Mass Loss Measurements and Optical Profilometry Traian-Lucian Severin, Viorel Paleu, Costică Bejinariu, Catrinel-Raluca Giurma-Handley, Ioan Tamasag, et al. Materials, 2026 The present study investigates the dry sliding wear behaviour of pure Zn, Zn–3Mg, and Zn–3Mg–0.5Y biodegradable alloys using mass loss measurements, friction torque monitoring on an Amsler tribometer, and optical profilometry of wear tracks. The microstructure of the Zn–Mg–Y alloy exhibited an α-Zn matrix comprising Zn–Mg intermetallic constituents and dispersed Y-rich phases. Tribological testing at 20 N and 30 N revealed a marked enhancement in wear resistance for Zn–3Mg in comparison to pure Zn, attributable to matrix strengthening by intermetallic phases. Despite the stabilising effect of Y on the friction response, there was no consistent reduction in wear volume under higher loads. Surface investigations have revealed a multifaceted wear mechanism, characterised by a combination of abrasion, oxide tribolayer formation, and localised adhesion. The measured wear rates were found to fall within the range documented in the available literature concerning biodegradable Zn-based alloys, thereby confirming the experimental validity of the findings. In summary, Zn–3Mg exhibited the optimal equilibrium between friction stability and wear resistance under the examined dry sliding conditions. However, further research in physiological environments is necessary to evaluate its biomedical applicability.
Artificial Intelligence Applications in Risk Management Within Integrated Management Systems: A Review Lucian Ispas, Costel Mironeasa, Traian-Lucian Severin, Delia-Aurora Cerlincă, Silvia Mironeasa Systems, 2025 Artificial intelligence is increasingly used in all fields, especially in the area of risk management within Integrated Management Systems (IMS). The paper aims to highlight the role of artificial intelligence (AI) in risk management, therefore providing opportunities for industrial organizations, offering significant advantages for improving the efficiency and accuracy of risk assessment and mitigation processes. By using advanced AI technologies, organizations can anticipate and manage risks more effectively, therefore optimizing operational performance and resilience. We reviewed and explored the main applications of AI implementation, risk management, the barriers encountered, and the advantages and disadvantages of using AI. A holistic analysis of IMS risk management, identification and assessment, operational efficiency of routine tasks, real-time data analysis, and immediate decision-making using AI was performed. The methods and technologies used are analyzed, along with the associated challenges, providing a comprehensive perspective on the impact of AI in industrial organizations. We conclude that the use of AI addresses challenges related to data quality, model interpretation, ethical issues, and high costs of implementation and management, which require qualified personnel. Also, we conclude that the use of AI in risk management for IMS presents significant opportunities for industrial organizations, including enhanced process monitoring, rapid information analysis, and swift response to emerging risks. This enables the optimization of risk management strategies, ultimately leading to increased operational safety and efficiency.
Experimental investigation of FDM manufacturing of 316 l stainless steel Delia-Aurora Cerlincă, Ioan Tamașag, Irina Beșliu-Băncescu, Traian-Lucian Severin, Constantin Dulucheanu International Journal of Advanced Manufacturing Technology, 2024 Continuous research in the field of metal additive manufacturing has led to the need for constant improvement of manufacturing parameters especially in the case of FDM (Fused Deposition Modeling) manufacturing. In recent years, the main directions outlined for productivity and quality improvement were related to higher printing speed and the use of ironing-type processes. This article aims to study the manufacturing parameters of the dimensional accuracy and surface quality of FDM-manufactured 316L stainless steel. The degree of novelty is given by the application of the ironing process for the green part. A full factorial 33 experimental design was designed for this study, in which the factors studied were ironing angle, ironing speed, and layer spacing during ironing. The dimensional accuracy and surface roughness were analyzed by means of deviation measurement from CAD to the green part and final part after the sintering process. Using the design of experiments offers the possibility of applying the analysis of variance (ANOVA) which provides information about the degree of influence of each of the studied factors. The results obtained for the dimensional accuracy showed that the ironing direction had the biggest influence on the Z-axis shrinkage. Overall, approximately 6% shrinkage in the Z and Y directions was obtained while in the X directions, the shrinkage percentage was around 20%. Surface roughness showed an improvement with higher ironing speeds for the green part while for the sintered part the most significant factor was ironing spacing.
ELASTOHYDRODYNAMIC EFFECTS IN LUBRICATION OF JOURNAL BEARINGS UNDER TURBULENT CONDITIONS Juliana Javorova, Iliya Andonov, Traian Severin, Luminita Irimescu, Yovko Rakanov Journal of Chemical Technology and Metallurgy, 2024 The current paper is aimed to investigate the deformability effects of the bearing surface on the lubrication performance of cylindrical journal bearing with finite length under turbulent conditions. The bush is coated with a thin resilient layer with a smooth surface, the radial distortions of which are of the same order of magnitude as the film thickness. The elastohydrodynamic problem is studied under elasticity conditions in accordance with the plain strain hypothesis (Winkler model). The modified Reynolds equation is carried out on the base of the turbulent lubrication model of Hirs (bulk flow model). The partial differential equation is solved numerically by successive over-relaxation technique on a finite difference grid, considering different values of coating materials, lubricant viscosity, and journal speed. Results for the performance characteristics of the bearing are given for several selected values of Reynolds number and elasticity parameters of the soft liner on the bush.
Experimental Study of In-Process Heat Treatment on the Mechanical Properties of 3D Printed Thermoplastic Polymer PLA Ioan Tamașag, Irina Beșliu-Băncescu, Traian-Lucian Severin, Constantin Dulucheanu, Delia-Aurora Cerlincă Polymers, 2023 The scientific literature regarding additive manufacturing, mainly the material extrusion method, suggests that the mechanical characteristics of the parts obtained by this technology depend on a number of the input factors specific to the printing process, such as printing temperature, printing trajectory, layer height, etc., and also on the post-process operations for parts, which, unfortunately, requires supplementary setups, equipment, and multiple steps that raise the overall costs. Therefore, this paper aims to investigate the influence of the printing direction, the thickness of the deposited material layer, and the temperature of the previously deposited material layer on the part tensile strength, hardness by means of Shore D and Martens hardness, and surface finish by using an in-process annealing method. A Taguchi L9 DOE plan was developed for this purpose, where the test specimens, with dimensions according to ISO 527-2 type B, were analysed. The results showed that the presented in-process treatment method is possible and could lead to sustainable and cost-effective manufacturing processes. The varied input factors influenced all the studied parameters. Tensile strength tended to increase, up to 12.5%, when the in-process heat treatment was applied, showed a positive linear variation with nozzle diameter, and presented considerable variations with the printing direction. Shore D and Martens hardness had similar variations, and it could be observed that by applying the mentioned in-process heat treatment, the overall values tended to decrease. Printing direction had a negligible impact on the additively manufactured parts’ hardness. At the same time, the nozzle diameter presented considerable variations, up to 36% for Martens hardness and 4% for Shore D, when higher diameter nozzles were used. The ANOVA analysis highlighted that the statistically significant factors were the nozzle diameter for the part’s hardness and the printing direction for the tensile strength.
Structures and Mechanical Properties of Some Dual-Phase Steels with Low Manganese Content Constantin Dulucheanu, Traian Lucian Severin, Delia Aurora Cerlinca, Luminita Irimescu Metals, 2022 In recent years, to reduce cars costs, research has been conducted on dual-phase steels with low manganese content (below 1.0%). This study investigated the influence of technological parameters of heat treatment (heating temperature and cooling medium) on such steels’ structures and mechanical properties. The ferrite-martensitic structures, specific for dual-phase steels, were obtained by intercritical quenching: heating of samples (made of alloys with 0.511% Mn, respectively 0.529% Mn) to temperatures located between critical points Ac1 and Ac3, followed by cooling in water without mechanical agitation and in water activated with ultrasounds at the frequency of 59 kHz. Through metallographic analyses and tensile tests, it was possible to determine the volume fraction of martensite, the ferrite microhardness, the ultimate tensile strength, the total elongation, and with the obtained data, their variations with the heating temperature and the cooling medium were established. Raising the heating temperature (between 760 °C and 820 °C) and using ultrasounds at cooling increased the volume fraction of martensite and the ferrite microhardness. This fact has increased the mechanical strength and reduced the deformability of the studied dual-phase steels. Intercritical quenching in water activated with ultrasounds provided values of structural characteristics and mechanical properties very close to those obtained by quenching in water without mechanical agitation, but was accomplished using a higher-temperature heating. The results obtained were compared with those determined in previous research, performed on dual-phase steel with 1.90% Mn.
Determination of the critical points in solid-state phase transformation of some hypoeutectoid steels Constantin Dulucheanu, Traian Lucian Severin, Alexandru Potorac, Luminita Irimescu E3s Web of Conferences, 2019 This study allowed, by dilatometric analyses, both to highlight the solid state transformations that occurred during the continuous heating of two hypoeutectoid steels, as well as to investigate the effect of the heating rate on the critical points at which these transformations occurred. The eutectoid transformation (the pearlite dissolution into austenite) was carried out in a temperatures interval, ranging between pearlite dissolution start temperature (Ac1) and pearlite dissolution finish temperature (denoted Acfp in this article). Increasing the heating rate determined a displacement of the critical points in solid-state phase transformation to higher temperatures; these displacements were more significant for the Acfp point, than for the critical points Ac1 and Ac3.
Use of Biopolymers in Designing Edible Packaging Materials for Food Industry Development of statistical models Materiale Plastice, 2019
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Mathematical modelling concerning the influence of chemical composition upon hardness of cadmium telluride crystal - Part 2- Bulgarian Chemical Communications, 2018
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Martens micro indentantion study of NI galvanic deposition Annals of Daaam and Proceedings of the International Daaam Symposium, 2011
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Research on iron and nickel migration from austenitic stainless steels into acid food products Annals of Daaam and Proceedings of the International Daaam Symposium, 2011
Contribution spectromectrical analysis of thermal plasma Annals of Daaam and Proceedings of the International Daaam Symposium, 2011
Portable hardness tester Annals of Daaam and Proceedings of the International Daaam Symposium, 2011
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Study the technological parameters influence on the hardness of Ni-W alloys obtained by galvanic deposition Annals of Daaam and Proceedings of the International Daaam Symposium, 2010
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RECENT SCHOLAR PUBLICATIONS
Comparative Wear Evaluation of Pure Zn, Zn–Mg and Zn–Mg–Y Alloys Using Mass Loss Measurements and Optical Profilometry TL Severin, V Paleu, C Bejinariu, CR Giurma-Handley, I Tamasag, ... Materials 19 (6), 1211 , 2026 2026
Artificial Intelligence Applications in Risk Management Within Integrated Management Systems: A Review L Ispas, C Mironeasa, TL Severin, DA Cerlincă, S Mironeasa Systems 13 (11), 967 , 2025 2025 Citations: 5
STUDY ON THE INFLUENCE OF CURRENT DENSITY AND TEMPERATURE ABOUT ELECTRODEPOSITIONS OF NICKEL BY ELECTROLYTES OF TYPE WATTS M Poroch-Seriţan, G Gutt, TL Severin Food and Environment Safety Journal 8 (2) , 2025 2025
VIRTUAL INSTRUMENTS FOR PARAMETER EVOLUTION SIMULATION IN A MILK STOCKING TANK SG Stroe, T Severin Food and Environment Safety Journal 7 (1) , 2025 2025
Experimental investigation of FDM manufacturing of 316 l stainless steel DA Cerlincă, I Tamașag, I Beșliu-Băncescu, TL Severin, C Dulucheanu The International Journal of Advanced Manufacturing Technology 135 (3), 1449 … , 2024 2024 Citations: 8
ELASTOHYDRODYNAMIC EFFECTS IN LUBRICATION OF JOURNAL BEARINGS UNDER TURBULENT CONDITIONS J Javorova, I Andonov, T Severin, L Irimescu, Y Rakanov Journal of Chemical Technology and Metallurgy 59 (3), 721-728 , 2024 2024
THE INFLUENCE OF THE VOLUME FRACTION OF MARTENSITE ON THE ABSORBED ENERGY IN THE CHARPY PENDULUM IMPACT TEST OF A DUAL-PHASE STEEL WITH 1.15% Mn and 1% Cr. C DULUCHEANU, C CALANCEA, TL SEVERIN, DA CERLINCĂ, ... TEHNOMUS , 2024 2024
Experimental study of in-process heat treatment on the mechanical properties of 3D printed thermoplastic polymer PLA I Tamașag, I Beșliu-Băncescu, TL Severin, C Dulucheanu, DA Cerlincă Polymers 15 (10), 2367 , 2023 2023 Citations: 25
WEAR OF MOLD PUNCHES FOR VIBROPRESSED PAVES. D CERLINCĂ, S SPÎNU, T SEVERIN, Ș JURESCHI TEHNOMUS , 2023 2023
Structures and mechanical properties of some dual-phase steels with low manganese content C Dulucheanu, TL Severin, DA Cerlinca, L Irimescu Metals 12 (2), 189 , 2022 2022 Citations: 16
LABORATORY STUDIES OF A DUAL-PHASE STEEL WITH 0.53% MN STRUCTURES. C DULUCHEANU, TL SEVERIN, DA CERLINCĂ, I TAMAȘAG, ... TEHNOMUS , 2022 2022
EXPERIMENTAL COMPARISION OF ABS-LIKE RESIN AND ABS FILAMENT USED IN ADDITIVE MANUFACTURING. I TAMAȘAG, I BEȘLIU-BĂNCESCU, TL SEVERIN, ... TEHNOMUS , 2022 2022
UNIVERSAL TENSILE GRIP FOR UNI-AXIAL TESTING OF 3D PRINTED SPECIMENS. I TAMAȘAG, I BEȘLIU-BĂNCESCU, D AMARANDEI, TL SEVERIN, ... TEHNOMUS , 2022 2022
Structures and Mechanical Properties of Some Dual-Phase Steels with Low Manganese Content. Metals 2022, 12, 189 C Dulucheanu, TL Severin, DA Cerlinca, L Irimescu s Note: MDPI stays neutral with regard to jurisdictional claims in published … , 2022 2022 Citations: 1
CONSIDERATIONS REGARDING THE EXTENSION BENDING OF WIDE BANDS ON DOUBLE CONVEX SURFACES. TL SEVERIN, C DULUCHEANU, D CERLINCĂ, L IRIMESCU TEHNOMUS , 2021 2021
ANNEALING INFLUENCE ON 3D PRINTED PARTS WITH AMORFOUS STRUCTURES. I TAMAţAG, L ISPAS, CM PICUS, TL SEVERIN, C DULUCHEANU TEHNOMUS , 2021 2021 Citations: 2
Dual-phase steels with low manganese content. Structures and mechanical properties C Dulucheanu, TL Severin, DA Cerlinca, L Irimescu, J Javorova BULGARIAN CHEMICAL COMMUNICATIONS, 5 , 2021 2021
INFLUENCE OF THE STRUCTURE SUCCESSION ON THE VOLUME FRACTION OF MARTENSITE AND FERRITE MICROHARDNESS IN A DUAL-PHASE STEEL WITH LOW MANGANESE CONTENT C Dulucheanu, TL Severin, L Irimescu, E Berariu, DA Cerlica International Multidisciplinary Scientific GeoConference: SGEM 20 (6.1), 69-76 , 2020 2020
INFLUENCE OF THE LABORATORY EQUIPMENT ON RESEARCH RESULTS ON A LOW MANGANESE DUAL-PHASE STEEL. C DULUCHEANU, TL SEVERIN, DA CERLINCĂ, L IRIMESCU, N BAZGA TEHNOMUS , 2020 2020
AN INSPECTION SOLUTION FOR PET BOTTLES. B Gurău, D Dascălu, L Irimescu, TL Severin TEHNOMUS , 2020 2020
MOST CITED SCHOLAR PUBLICATIONS
Design of experiments for statistical modeling and multi-response optimization of nickel electroplating process M Poroch-Seritan, S Gutt, G Gutt, I Cretescu, C Cojocaru, T Severin Chemical Engineering Research and Design 89 (2), 136-147 , 2011 2011 Citations: 86
Experimental study of in-process heat treatment on the mechanical properties of 3D printed thermoplastic polymer PLA I Tamașag, I Beșliu-Băncescu, TL Severin, C Dulucheanu, DA Cerlincă Polymers 15 (10), 2367 , 2023 2023 Citations: 25
Structures and mechanical properties of some dual-phase steels with low manganese content C Dulucheanu, TL Severin, DA Cerlinca, L Irimescu Metals 12 (2), 189 , 2022 2022 Citations: 16
Influence of intercritical quenching on the structure and mechanical properties of a dual-phase steel with low manganese content C Dulucheanu, T Severin, A Potorac, L Irimescu Materials Today: Proceedings 19, 941-948 , 2019 2019 Citations: 14
Experimental investigation of FDM manufacturing of 316 l stainless steel DA Cerlincă, I Tamașag, I Beșliu-Băncescu, TL Severin, C Dulucheanu The International Journal of Advanced Manufacturing Technology 135 (3), 1449 … , 2024 2024 Citations: 8
Technological Characteristics of a Dual-Phase Steel with 0.09% C and 1.90% Mn Obtained by Intercritical Quenching C Dulucheanu, N Bancescu, T Severin Advanced Materials Research 814, 60-67 , 2013 2013 Citations: 8
Some Archaeometrical Determinations on a Lot of Cucutenian Ceramic Materials of Site Feteşti-La Schit (Adâncata Commune, Suceava County) M Gramaticu, DD Boghian, N Băncescu, TL Severin, SG Stroe, ... Codrul Cosminului 16 (2), 5-20 , 2010 2010 Citations: 8
Modelling and optimization study on hardness of Ni-Fe alloy thin films through electroplating process M Poroch-Seriţan, P Bulai, TL Severin, G Gutt Applied Mechanics and Materials 657, 286-290 , 2014 2014 Citations: 7
Determination of the critical points in solid-state phase transformation of some hypoeutectoid steels C Dulucheanu, TL Severin, A Potorac, L Irimescu E3S Web of Conferences 95, 04004 , 2019 2019 Citations: 6
The Influence of Ultrasounds on the Structure of some Low Carbon and Manganese Dual-Phase Steels C Dulucheanu, T Severin International Multidisciplinary Scientific GeoConference: SGEM 17, 85-92 , 2017 2017 Citations: 6
Artificial Intelligence Applications in Risk Management Within Integrated Management Systems: A Review L Ispas, C Mironeasa, TL Severin, DA Cerlincă, S Mironeasa Systems 13 (11), 967 , 2025 2025 Citations: 5
The Quenching in Ultrasonic Field of the Bearing Steels. Advantages and Perspectives. Part 1: The Influence of the Quenching Technology on Hardness and Structure of a RUL 1 Steel N Bancescu, C Dulucheanu, T Severin Metalurgia International 18, 43-48 , 2013 2013 Citations: 5
The Influence of Quenching Temperature on the Mechanical Properties of a Dual-Phase Steel with 0.094% C and 0.53% Mn C Dulucheanu, N Bancescu, T Severin Applied Mechanics and Materials 808, 28-33 , 2015 2015 Citations: 4
THE INFLUENCE OF QUENCHING MEDIUM ON THE STRUCTURE AND MECHANICAL PROPERTIES OF THE DUAL-PHASE STEEL WITH 0, 09% C 1, 90% Mn C Dulucheanu, N Bancescu, T Severin Metalurgia international 16 (5), 25 , 2011 2011 Citations: 4
PORTABLE HARDNESS TESTER. S Gutt, G Gutt, TL Severin, M Poroch-Seritan, S Mironeasa, MA Oroian Annals of DAAAM & Proceedings , 2011 2011 Citations: 4
Synthesis and characterization of nickel iron alloys by electrodeposition M POROCH-SERIŢAN, S GUTT, G GUTT, MM BOBU, T SEVERIN 2010 Citations: 4
THE INFLUENCE OF HEATING RATE ON THE COEFFICIENT OF LINEAR THERMAL EXPANSION OF A 0.087% C AND 0.511% Mn STEEL. C Dulucheanu, T Severin, M Băeşu Tehnomus , 2017 2017 Citations: 3
Considerations regarding the use of chuck collets in mechanical systems TL Severin, R Vasile TEHNOMUS Journal, Suceava, 207-210 , 2011 2011 Citations: 3
Research on universal dynamic hardness test G Gutt, S Gutt, V Vasilache, TL Severin Roznov. Pod. Radhostem 5, 1-8 , 2010 2010 Citations: 3
RESEARCH ON THE SPATIAL DISTIBUTION OF MECHANICAL CHARACTERISTICS IN A CADMIUM TELLURIDE CRYSTAL. G Gutt, S Gutt, TL Severin, V Vasilache Annals of DAAAM & Proceedings , 2010 2010 Citations: 3
