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About me

I am responsible of the research services and the infrastructure of Tampere Wear Center and the materials characterization facilities. 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.

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-

Research fields

Materials science, wear of materials, materials characterization

Selected publications

 I have over 70 peer-reviewed scientific articles and about 70 other scientific publications, including conference papers with h-index 21 (Scopus). 

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).

Latest publications

Enhancing the cavitation erosion resistance of AISI 420-type stainless steel with quenching and partitioning

Raami, L., Varis, T., Valtonen, K., Wendler, M., Volkova, O. & Peura, P., Apr 2023, In: Wear. 526-527, 8 p., 204897.

Research output: Contribution to journalArticleScientificpeer-review

High-stress abrasive wear performance of medium-carbon direct-quenched and partitioned, carbide-free bainitic, and martensitic steels

Haiko, O., Pallaspuro, S., Javaheri, V., Kaikkonen, P., Ghosh, S., Valtonen, K., Kaijalainen, A. & Kömi, J., 15 Aug 2023, In: Wear. 526-527, 204925.

Research output: Contribution to journalArticleScientificpeer-review

Experimental studies of high stress abrasive and impact-abrasive wear

Valtonen, K., 14 Jun 2022.

Research output: Other conference contributionAbstractScientific

Formation of nanostructured surface layer, the white layer, through solid particles impingement during slurry erosion in a martensitic medium-carbon steel

Javaheri, V., Sadeghpour, S., Karjalainen, P., Lindroos, M., Haiko, O., Sarmadi, N., Pallaspuro, S., Valtonen, K., Pahlevani, F., Laukkanen, A. & Kömi, J., 15 May 2022, In: Wear. 496-497, 204301.

Research output: Contribution to journalArticleScientificpeer-review

High-stress abrasive wear characteristics of ultra-high strength press-hardening steel

Haiko, O., Valtonen, K., Kaijalainen, A., Javaheri, V. & Kömi, J., 2022, In: Tribologia. 39, 3-4, p. 32-41 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Influence of process parameters on the particle–matrix interaction of WC-Co metal matrix composites produced by laser-directed energy deposition

Ostolaza, M., Arrizubieta, J. I., Queguineur, A., Valtonen, K., Lamikiz, A. & Flores Ituarte, I., Nov 2022, In: Materials and Design. 223, 111172.

Research output: Contribution to journalArticleScientificpeer-review

Mikroskopiakonferenssi Scandem 2022

Honkanen, M., Salminen, T., Valtonen, K. & Vippola, M., 2022, In: Materia. 4, p. 59-60 2 p.

Research output: Contribution to journalArticleProfessional

Scandem 2022: Book of Abstracts

Honkanen, M., Rantala, J., Salminen, T., Valtonen, K. & Vippola, M., 2022, Tampere: Tampere University.

Research output: Book/ReportAnthologyProfessional

Impacts of Phosphorous Source on Organic Acid Production and Heterotrophic Bioleaching of Rare Earth Elements and Base Metals from Spent Nickel-Metal-Hydride Batteries

Rasoulnia, P., Barthen, R., Valtonen, K. & Lakaniemi, A-M., 2021, In: Waste and Biomass Valorization. 12, 10, p. 5545–5559 15 p.

Research output: Contribution to journalArticleScientificpeer-review