Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Sakari Pallaspuro"'
Autor:
Vahid Javaheri, Sakari Pallaspuro, Saeed Sadeghpour, Sumit Ghosh, Johannes Sainio, Renata Latypova, Jukka Kömi
Publikováno v:
Materials & Design, Vol 231, Iss , Pp 112059- (2023)
Rapid tempering is a remarkable sustainable and energy-efficient way to modify properties of as-quenched martensite, particularly its toughness and ductility. In this work, tensile and fracture toughness properties, and microstructural evolution of a
Externí odkaz:
https://doaj.org/article/ec1243f2dc7b42259463e026fedfa41e
Autor:
Sumit Ghosh, Pentti Kaikkonen, Vahid Javaheri, Antti Kaijalainen, Ilkka Miettunen, Mahesh Somani, Jukka Kömi, Sakari Pallaspuro
Publikováno v:
Journal of Materials Research and Technology, Vol 17, Iss , Pp 1390-1407 (2022)
The novel processing concept of direct quenching and partitioning (DQ&P) has been explored with a medium-carbon (0.4 wt.% C) steel to evaluate and optimize the processing route for excellent property combinations. New compositional design approach wa
Externí odkaz:
https://doaj.org/article/743424a5edb04d50a24a2be63951a6ea
Publikováno v:
Journal of Materials Research and Technology, Vol 11, Iss , Pp 1045-1060 (2021)
Quenching and partitioning (Q&P) treated steels are traditionally alloyed with silicon (Si), but its precise role on microstructural mechanisms occurring during partitioning is not thoroughly understood. In this study, dilatometric analysis has been
Externí odkaz:
https://doaj.org/article/4e457d4a8df84cf783c9bf57522451e7
Autor:
Markus Köhler, Li Sun, Jonas Hensel, Sakari Pallaspuro, Jukka Kömi, Klaus Dilger, Zhiliang Zhang
Publikováno v:
Materials & Design, Vol 210, Iss , Pp 110122- (2021)
Quality assurance is one of the largest challenges to the widespread adoption of metal additive manufacturing technology. Deposition pattern can significantly impact the temperature distribution during manufacturing process and thus the overall quali
Externí odkaz:
https://doaj.org/article/ca3f536def614272a605fd26dc6e8471
Autor:
Oskari Haiko, Antti Kaijalainen, Sakari Pallaspuro, Jaakko Hannula, David Porter, Tommi Liimatainen, Jukka Kömi
Publikováno v:
Applied Sciences, Vol 9, Iss 20, p 4231 (2019)
In this paper, the effects of different tempering temperatures on a recently developed ultrahigh-strength steel with 0.4 wt.% carbon content were studied. The steel is designed to be used in press-hardening for different wear applications, which requ
Externí odkaz:
https://doaj.org/article/5da372e6cac545f3a224e0df7a796634
The effect of Pd and Ni coatings on hydrogen permeation experiments of as-quenched martensitic steel
Autor:
Renata Latypova, Tun Tun Nyo, Oskari Seppälä, Kasper Hahtonen, Hannu Hänninen, Jukka Kömi, Sakari Pallaspuro
Publikováno v:
Corrosion Reviews.
Hydrogen permeation technique is a widely used testing method for the determination of hydrogen diffusion coefficient (D), which is an important parameter considering hydrogen embrittlement. A palladium (Pd) or nickel (Ni) coating is often utilised o
Autor:
Oskari Haiko, Sakari Pallaspuro, Vahid Javaheri, Pentti Kaikkonen, Sumit Ghosh, Kati Valtonen, Antti Kaijalainen, Jukka Kömi
Experimental steels, a direct-quenched and partitioned (DQP) steel and a carbide-free bainitic steel (CFB), were tested along with a commercial martensitic 500 HB grade wear resistant steel in high-stress abrasive conditions. The three steels had dif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::084440aaa6842bbd515e94b840581b15
https://trepo.tuni.fi/handle/10024/148310
https://trepo.tuni.fi/handle/10024/148310
Autor:
Renata Latypova, Oskari Seppälä, Tun Tun Nyo, Timo Kauppi, Saara Mehtonen, Hannu Hänninen, Jukka Kömi, Sakari Pallaspuro
Funding Information: This research was supported by Business Finland Oy, and projects ISA – Intelligent Steel Applications and FOSSA–Fossil-Free Steel Applications, are acknowledged. Academy of Finland (#337108) is thanked for funding, too. The a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0be48f0db5f2065c2377824314286bc
https://aaltodoc.aalto.fi/handle/123456789/119806
https://aaltodoc.aalto.fi/handle/123456789/119806
Publikováno v:
Procedia Structural Integrity. 42:919-926
In the present study, very high cycle fatigue (VHCF) characteristics and properties of a direct quenched and partitioned (DQ&P) medium carbon (0.4 wt.% C) steel having ultrahigh-strength (UTS > 2 GPa) was investigated using an ultrasonic-fatigue test
Autor:
Sakari Pallaspuro, Ann-Christin Hesse, Tim Engelke, Johannes Sainio, Sumit Ghosh, Vahid Javaheri, Klaus Dilger, Jukka Kömi
Publikováno v:
Procedia Structural Integrity. 42:895-902
Third generation advanced high-strength steels, e.g., quenched and partitioned steels, are forthcoming structural materials, which consist of a martensitic matrix and a substantial proportion of stabilized residual austenite for improved deformabilit