Dr.-Ing. Spyros PAPAEFTHYMIOU is a Mining & Metallurgical Engineer. He graduated from the National Technical University of Athens (NTUA: in Greek: “Ethniko Metsovio Polytechnio”) in 2000 and received the academic degree of “Dr.-Ing.” In 2005 from the RWTH Aachen University, Germany. As a researcher in Aachen and in Delft (at the Technical University of Delft, The Netherlands) he focused in Advanced High Strength Steels (AHSS) for the automotive industry, e.g. TRIP (Transformation Induced Plasticity), DP (Dual Phase), CP (Complex Phase) steels. After a more than 10 years professional activity in the Greek Industry he was appointed lecturer in 2014 at the NTUA. In 2015 he was elected and appointed Assistant Professor at the Laboratory of Physical Metallurgy, Division of Metallurgy and Materials of the School of Mining & Metallurgical Engineering of the NTUA.

He works in the field of Physical Metallurgy & alloy design and more specifically he is specialized in the microstructure-properties-fracture relationships, in the forming of metals and alloys, in welding and joining and heat treatments, in mechanical properties of materials and in the modelling and simulation of microstructures and materials processing.

He wrote the book “Materials Technology” (in Greek) (ISBN: 978-960-337-129-8, Eugenides Foundation, 2nd Edition 2017). He has published 32 scientific publications in international journals, 25 articles in the proceedings of international conferences with referees, 20 articles in national conferences with referees. Since 2014 he has completed the supervision of 32 Diploma Theses, he currently supervises 5 Diploma Theses, 2 Master Theses (1 completed in 2018). Additionally, he supervises 5 PhD Theses and co-supervises 7 PhDs. He also co-supervised 37 Diploma Theses until today.

He is reviewer in 12 international journals, member of the Technical Camber Greece, member of the permanent committee of Materials of the Technical Chamber Greece (2006-2009), selected member of the “Verein zur Förderung der Aachener Eisenhüttenkunde e.V. – VAEh (Germany)”, he has been treasurer of the Hellenic Metallurgical Society (2012-2016) and he contributed to the attraction and organization of the international conference EUROMAT 2017, which took place at Thessaloniki in September 2017.

Dr.-Ing. Spyros Papaefthymiou, 2018

Dr.-Ing. Spyros Papaefthymiou, 2018


Assistant Professor Dr.-Ing. Spyros Papaefthymiou was selected by the international journal “Materials” and joined the journal’s “Reviewers Board”, where excellent reviewers are listed in order to acknowledge their assistance in the highly demanding peer review process.

Stand: February 2019

top reviewer for 2019


On September 17th Asst. Prof. Dr.-Ing. S. Papaefthymiou has been named a Top Reviewer in the Global Peer Review Awards, powered by Publons!

The top 1% of reviewers in each of the 22 Essential Science Indicators (ESI) research fields can be found here:


Rankings are calculated by number of verified pre-publication reviews performed and added to Publons between 1 September 2018 and 1 September 2019. Reviews were attributed to an ESI field based on the journal the review was performed for. We added a 22nd field, "Cross-field" to celebrate reviewers whose contributions were for the small amount of journals on Publons that could not be directly matched to an ESI field.


top reviewer for 2018 amongst 97.000 scholars

On February 1st 2019 Asst. Prof. Dr.-Ing. Spyros Papaefthymiou is selected as top reviewer (1 of 30 top reviewers) for MDPI journals in 2018 amongst 97.000 scholars.


Rigorous peer-review is the cornerstone of high quality academic publishing. Over 97,000 scholars served as reviewers for MDPI journals in 2018. We are extremely appreciative of all those who made a contribution to the editorial process in this capacity. At the beginning of every year, journal editorial offices publish a list all reviewers’ names to express our gratitude. In addition, this year the “MDPI Top Reviewer Awards” are announced, to recognize the very best reviewers for their expertise, dedication, high quality, and timely review reports.


2018 Peer Review Awards

Top 1% in Materials Science

For the year 2017-2018 Dr. Papaefthymiou is placed amongst the top 1% reviewers worldwide in the field of Materials Science & Technology.

The top 1% of reviewers in each field who performed the most verified pre-publication peer reviews on Publons for the 2018 global Peer Review Awards


Peer Review Week Award.jpg


Over 6,000 experts are honored as world-class peer reviewers and editors in Publons’ 2018 global Peer Review Awards!
The awards, announced during this year’s Peer Review Week, celebrate reviewers as the #SentinelsofScience and research, tirelessly proving their unwavering commitment towards the quality and integrity of scholarly communication.
In 2018, there were:
• 230K+ award-winning reviews written for more than 10,000 journals
• 2,000+ institutions named as housing the world’s top reviewers and  editors
• 100+ countries celebrated for hosting our 6,000+ award-winners
• 38 Publons Academy graduates named in this year’s awards.

short professional pathway

[07/2015 – today]  Assistant Professor for Metal forming and Welding-Joining technology, NTUA, School of Mining & Metallurgical Engineering, Division of Metallurgy and Materials, Laboratory of Physical Metallurgy

[07/2014]  Lecturer of NTUA, School of Mining & Metallurgical Engineering, Division of Metallurgy and Materials, Laboratory of Physical Metallurgy; scientific area: Metal forming and Welding-Joining technology

[01/2014 - today]  SIDENOR S.A.; Process & Product Development Manager

[July 2011]  Elected Lecturer of the NTUA, School of Mining and Metallurgy. Fields of expertise: a) Metal Forming and b) Welding Technology

[01/2008 - today]  ELKEME S.A. (Hellenic Research Centre for Metals) / VIOHALCO Group / R&D Projects & Steel Physical Metallurgy Coordination Officer

[02/2006 – 09/2007]  External co-worker ELKEME S.A., Consulting in micro-alloying of steels

[03/2006 – 12/2006]  Scientific co-worker of University of Patras

[07/2006 – 12/2007]  MIRTEC S.Ε., R&D and Strategic Development

[06-09/2007]  Centre of Research and Development Thessaly Proposal: Platform for Aluminum and Steel in Thessaly

professional membership

Member of the Technical Chamber of Greece, member of the permanent Materials Committee of the Technical Chamber of Greece (2006-2009),  selected member of the “Verein zur Förderung der Aachener Eisenhüttenkunde e.V. – VAEh” in Germany, and Treasurer of the Hellenic Metallurgical Society (2012-2016) contributing in the organisation of the international conference EUROMAT 2017,  which was held in Thessaloniki in September 2017.

academic activities

infographic SP 2019-_11.5.19-En.png
book cover.png

book "materials Technology" (gr)

This book entitled “Materials Technology” of S. Papaefthymiou is the updated 2nd Edition of the book “Metallurgy” of P. Petropoulos. The book refers to the students of the second semester of the Schools of Navy & Engineering. The content introduces students in the world of materials in a scientific yet simple way. The content of the book is restricted to the absolute necessary so that the students and all interested readers can focus on the important parts of materials technology in order to build a first holistic approach and knowledge regarding industrial alloys, the selection and utility of materials.


Date of appearance: 2017 (second Edition)

Eugenides Foundation://www.eef.edu.gr/#




SP Diss 2nd title page.png
SP Diss 3rd title page.png

selected publications

Banis, A.; Hernandez Duran, E.; Bliznuk, V.; Sabirov, I.; Petrov, R.H.; Papaefthymiou, S. The Effect of Ultra-Fast Heating on the Microstructure, Grain Size and Texture Evolution of a Commercial Low-C, Medium-Mn DP Steel. Metals 2019, 9, 877. https://doi.org/10.3390/met9080877

Papaefthymiou, S.; Banis, A.; Bouzouni, M.; Petrov, R.H. Effect of Ultra-Fast Heat Treatment on the Subsequent Formation of Mixed Martensitic/Bainitic Microstructure with Carbides in a CrMo Medium Carbon Steel. Metals 20199, 312. (https://doi.org/10.3390/met9030312) https://www.mdpi.com/2075-4701/9/3/312 

Stavroulakis, P., Toulfatzis, A., Vazdirvanidis, A., Pantazopoulos, G., Papaefthymiou, S.: Investigation of the Aging Behavior of a Cu–Ni–Si Rolled Alloy, Metallography, Microstructure. and Analysis, ASM International. (2019). https://doi.org/10.1007/s13632-019-00531-6

Papaefthymiou, S.; Karamitros, V.; Bouzouni, M. Ultrafast Heating and Initial Microstructure Effect on Phase Transformation Evolution of a CrMo Steel. Metals 20199, 72. https://doi.org/10.3390/met9010072 (https://www.mdpi.com/2075-4701/9/1/72)

Kaban, I.; Agathopoulos, S.; Valenza, F.; Sommitsch, C.; Schenk, J.; Papaefthymiou, S.; Karantzalis, A.: Guest Editorial, Journal of Materials Engineering and Performance (2018)27: 4981https://doi.org/10.1007/s11665-018-3679-x

Sismanis P.; Papaefthymiou S.: The quest for better structural steels, Civil Eng Res J 6(4): CERJ.MS.ID.555692 (2018), DOI: 10.19080/CERJ.2018.06.555692

Papaefthymiou S., Bouzouni M., Petrov R. H.: Study of Carbide Dissolution and Austenite Formation during Ultra – Fast Heating in Medium Carbon Chromium Molybdenum Steel, Metals(2018), 8, 646; doi:10.3390/met8080646 

Papaefthymiou, S. , Goulas, C. , Castro Cerda, F. M., Geerlofs, N. and Petrov, R. (2017), The Effect of Heating Rate on the Microstructure of a Soft‐Annealed Medium Carbon Steel, steel research int., 88: 1700158. doi:10.1002/srin.201700158

Papaefthymiou S., Bouzouni M., Gavalas E.: Theoretical study of particle dissolution during homogenization in Cu–Fe–P alloy, Metals 8 (2018) No.6

F Castro Cerda, C Goulas, I Sabirov, S Papaefthymiou, A Monsalve, R.H. Petrov: Microstructure, texture and mechanical properties in a low carbon steel after ultrafast heating, Materials Science and Engineering A 672, 108-120, 2016

FM Castro Cerda, B Schulz, S Papaefthymiou, A Artigas, A Monsalve, Roumen H Petrov: The Effect of Ultrafast Heating on Cold-Rolled Low Carbon Steel: Formation and Decomposition of Austenite, Metals 6 (12), 321, 2016

Stavroulakis P., Toulfatzis A., Vazdirvanidis A., Pantazopoulos G., Papaefthymiou S.: Mechanical behaviour and microstructure of heat-treated Cu–Ni–Si alloy, Materials Science and Technology (2018)

Gavalas E., Pressas I., Papaefthymiou S.: Mesh sensitivity analysis on implicit and explicit method for rolling simulation, International Journal for Structural Integrity (2018)

Athanasopoulos N., Gavalas E., Papaefthymiou S.: Prediction of pipeline collapse due to hydrostatic pressure, International Journal of Structural Integrity (2018)

Sismanis, P., Bouzouni, M., Papaefthymiou, S.: Modeling of Crucial Process Parameters for the Continuous Improvement of Special Steels at the Stomana Plant, Journal of Material Engineering and Performance (2018), Springer US, ISSN 1059-9495. https://doi.org/10.1007/s11665-018-3616-z

Papaefthymiou S., Vazdirvanidis A., Pantazopoulos G., Goulas C.: Fatigue Fracture of a High-Resistance Structural Steel Component Destined to Sustain Severe Loads Under Service Conditions, Journal of Failure Analysis and Prevention17 (2017) No.1, pp.79 – 85.

S Papaefthymiou: A New Opportunity for the Design of Advanced High Strength Steels with Heterogeneous-Phase Microstructures via Rapid Thermal Processing, J Nanosci Adv Tech 2 (1), 20-23, 2017

M Bouzouni, S Papaefthymiou: Modeling of the Steel Microstructure Gained after the Application of an Ultra-Fast Heat Treatment, J Nanosci Adv Tech 2 (1), 15-19, 2017

Papaefthymiou, S.; Goulas, C.; Gavalas, E.: Micro-Friction Stir Welding of Titan Zinc Sheets,
Journal of Materials Processing Technology, http://dx.doi.org/doi:10.1016/j.jmatprotec.2014.08.029, 2014

Papaefthymiou, S.: Root cause analysis of surface and internal defects of micro-alloyed S355 heavy plates, International Journal of Structural Integrity, Emerald Group Publishing Limited 1757-9864, http://dx.doi.org/10.1108/17579861311303654, Vol. 4 No. 1, 2013, pp. 91-107 (


Under GRADUATE courses

“Welding Metallurgy, Technology & Evaluation” for the students of the 8th semester of Materials Science & Technology

“Solidification, Casting & Non Destructive Testing” for the students of the 8th semester of Materials Science & Technology

“Metal Forming” for the students of the 9th semester of Materials Science & Technology

Joint teaching

“Historical advances of Mining & Metallurgy” for the students of the 1st semester of Mining & Metallurgical Engineering


“Welding” for the MSC “Materials Science & Technology”

“Technology of Welding Structures” for the MSc «Automatisation Systems»