Kati Valtonen
kati.valtonen@tuni.fi
+358 40 849 0142
Tampere University
Hervanta Kampus
Korkeakoulunkatu 6
33720 Tampere
Contact
Veli-Tapani Kuokkala
- Emerita/Emeritus
- Faculty of Engineering and Natural Sciences
- Tampere University
- +358408490040
- veli-tapani.kuokkala@tuni.fi
Kati Valtonen
- Staff Scientist
- Faculty of Engineering and Natural Sciences
- Tampere University
- +358408490142
- kati.valtonen@tuni.fi
More information
About me
I am responsible of the research services and the infrastructure of Tampere Wear Center and the materials characterization facilities. In addition, I work as a coordinator of Wear Forum that is a collaboration network between TWC, research institutes, and companies. My particular research interests are the high stress abrasive and impact wear of steels, characterization of wear mechanisms, and assessment of the relevance of laboratory wear test methods in regard of the in-service performance of steels and other wear resistant materials. I have over 70 peer-reviewed scientific articles and about 70 other scientific publications, including conference papers with h-index 20 (Scopus).
Research fields
Materials science, wear of materials, materials characterization
Main positions of trust
Societal Interaction Council of Tampere University, member, 2019-
Faculty Council of Engineering and Natural Sciences, member, 2019-
Community expert group on interaction and communications, member, 2022-
Tribologia - Finnish Journal of Tribology, editor, 2012-
Finnish Society for Tribology, board member, 2014-
Organiziner of the annual TWC International Wear Seminar 2009-
Selected publications
Key publications:
Valtonen, K., Ojala, N., Haiko, O., Kuokkala, V.-T. Comparison of various high-stress wear conditions and wear performance of martensitic steels, Wear 426–427:3-13(2019).
Chintha, A.R., Valtonen, K. Kuokkala, V.-T., Kundu, S. Peet, M., Bhadeshia, H.K.D.H. Role of fracture toughness in impact-abrasion wear, Wear 428–429:430-437(2019).
Valtonen, K., Ratia, V., Ramakrihnan, K.R., Apostol, M., Terva, J., Kuokkala, V.-T., Impact wear and mechanical behavior of steels in subzero conditions. Tribology International 129:476-493(2019).
Valtonen, K., Keltamäki, K., Kuokkala, V.-T., High-stress abrasion of wear resistant steels in the cutting edges of loader buckets, Tribology International 119: 707–720(2018).
Valtonen, K., Ratia, V., Ojala, N., Kuokkala, V.-T., Comparison of laboratory wear test results with the in-service performance of cutting edges of loader buckets, Wear 388-389:93-100(2017).
Ojala, N., Valtonen, K., Minkkinen, J. & Kuokkala, V.-T. Edge effect in high speed slurry erosion wear tests of steels and elastomers, Wear 388-389:126-135(2017).
Ojala N., Valtonen K., Antikainen, A., Kemppainen, A., Minkkinen, J., Oja, O., Kuokkala V.-T. Wear performance of quenched wear resistant steels in abrasive slurry erosion, Wear 354-355:21-31(2016).
Oksanen, V., Valtonen, K., Andersson, P., Vaajoki, A., Laukkanen, A., Holmberg, K. & Kuokkala, V. T. 2015. Comparison of laboratory rolling-sliding wear tests with in-service wear of nodular cast iron rollers against wire ropes, Wear 340-341:73-81(2015).
Lindroos, M., Valtonen, K., Laukkanen, A., Holmberg, K., Kuokkala, V-T., Kemppainen, A., Wear behavior and work hardening of high strength steels in high stress abrasion, Wear 322-323:32-40(2015).
Ojala, N., Valtonen K., Heino V., Kallio M., Aaltonen J., Siitonen P. & Kuokkala, V.-T., Effects of composition and microstructure on abrasive wear performance of quenched wear resistant steels, Wear 317(1–2): 225–232(2014).
Ojala, N., Valtonen, K., Kivikytö-Reponen, P., Vuorinen, P., Siitonen, P. & Kuokkala, V.-T., The effect of test parameters on large particle high-speed slurry erosion testing, Tribology - Materials, Surfaces & Interfaces 8(2):98-104(2014).
Ratia, V., Valtonen, K., Kemppainen, A., Vippola, M., Kuokkala, V.-T., High-Stress Abrasion and Impact-Abrasion Testing of Wear Resistant Steels, Tribology Online 8(2):152-161(2013).
Minnamari Vippola
- Professor
- Vice Dean for Research
- Faculty of Engineering and Natural Sciences
- Tampere University
- +358408490148
- minnamari.vippola@tuni.fi
More information
About me
I have Professorship (Tenured) in Materials Characterization. My research areas include microstructural characterization and NDT (non-destructive testing) of various materials together with activities in material prosessing, performance and failure analysis. My special expertise area is on electron microscopy including the leadership in university-level microscopy infrastructure (Tampere Microscopy Center). I also act as Vice Dean for Research in Faculty of Engineering and Natural Sciences.
Responsibilities
- Professor in Materials Characterization and Head of the Materials Characterization group, Materials Science and Environmental Engineering
- Vice Dean for Research in the Faculty of Engineering and Natural Sciences
- Head of Tampere Microscopy Center
- Head of the Doctoral Program in Engineering Sciences
Research unit
Materials Science and Environmental Engineering
Research career
1. Professor (tenured), Tampere University 2019-
2. Professor (tenured) (2016 - 2018) Tampere University of Technology
3. Associate professor (tenure track) (2013 - 2016) Tampere University of Technology
4. Senior Researcher (fulltime/part time, 2007 - 2013) Finnish Institute of Occupational Health, Work Environment Development
5. Visiting Researcher (1-3/1999) Stockholm University, Structural Chemistry, Arrhenius Laboratory
6. Visiting Scholar (2-7/1996) University of Illinois at Urbana-Champaign, Frederick Seitz Materials Research Laboratory
7. Researcher/Senior Researcher/Senior Research Fellow (1996 – 2013) Tampere University of Technology
Funding
Important funding instruments: Academy of Finland, Business Finland, EU, foundations and industry.
Main positions of trust
- Tampere University: Member in TAU Science council, Steering group member in PROFI6 Tampere Imaging Research Platform and Steering group member in Tampere Health project
- Board member of SCANDEM Nordic Microscopy Society since 2012
- Earlier in Academy of Finland: Member of the Research Council for Natural Sciences and Engineering (2019-21) and Member if The Finnish Research Infrastructure Committee (FIRI Committee 2019-22)
Pasi Peura
- Professor
- Metallimateriaalit, metallitekniikka ja materiaalikarakterisointi
- Faculty of Engineering and Natural Sciences
- Tampere University
- +358503013884
- pasi.peura@tuni.fi
More information
About me
Presently I work as Professor of Metals technology at TAU's Hervanta Campus. Metals technology is a wide research area spreading from the development of new alloys to the utilization of traditional and new manufacturing methods in the production of structural components. The manufacturing methods we are interested in include forming (also forging and hot/cold rolling), additive manufacturing, welding and heat-treating among others. Main target is to understand how the final properties can be improved by the help of metallurgy. In practice, our goal is to understand the basic phenomena and mechanisms in the development of optimum microstructure and properties. One novel alloy group we are focusing on is high entropy alloys. We also have a major focus on steel research, where the main driving force for the research and development of new low alloyed steel grades has been the automotive industry. Presently, the utilization of new heat treatment procedures in order to improve formability (especially press formability) are under investigation. Those include metal coated and uncoated press hardening boron steels, novel multiphase steels like Q&P and other steels utilizing transformation induced plasticity effect. In addition, due to my over 20 years experience in industry, large part of my groups activities are done in co-operation with industry. This co-operation includes both long projects but also smaller studies/experimental works.
Main positions of trust
International Deep Drawing Research Group (IDDRG), Executive committee 2011 -
Heat Treatment and Forging Branch Group member 2014 -
Aluminium Product Branch Group member 2017 -
National standardization committee K 900 “Steels and mechanical testing”, member
finddrg member 2014 -
Finnish Association of Mining and Metallurgical Engineers, board member 2016 – 2019
Selected publications
Curtze, S., Kuokkala, V-T., Hokka, M., Peura, P., “Deformation Behavior of TRIP and DP Steels in Tension at Different Temperatures over a Wide Range of Strain Rates”, Materials Science and En-gineering A. Vol. 507, no. 1-2, p124-131 (2009) DOI: 10.1016/j.msea.2008.11.050
Nyyssönen, T., Isakov, M., Peura, P. and Kuokkala V.-T.,”Iterative Determination of the Orientation Relationship Between Austenite and Martensite/Bainite from a Large Amount of Grain Pair Misorientations”, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 47, No. 6, 2016, p. 2587-2590
Järvinen, H., Isakov, M., Nyyssönen, T., Järvenpää, M., Peura, P., “The effect of initial microstructure on the final properties of press hardened 22MnB5 steels”, Materials Science & Engineering A 676, p. 109–120, 2016
Nyyssönen, T., Peura, P., Kuokkala, V.-T., “Crystallography, Morphology and Martensite Transformation of Prior Austenite in Intercritically Annealed High-Aluminium Steel”, Metallurgical and Materials Transactions A, 49 (12), pp. 6426-6441, 2018 https://doi.org/10.1007/s11661-018-4904-9
Patnamsetty, M., Somani, M.C., Ghosh, S., Ahmed, S., Peura, P., "Processing map for controlling microstructure and unraveling various deformation mechanisms during hot working of CoCrFeMnNi high entropy alloy", Materials Science and Engineering: A, VOL 793, 139840, 2020 https://doi.org/10.1016/j.msea.2020.139840.