Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Iikka Virkkunen"'
Publikováno v:
Nuclear Materials and Energy, Vol 31, Iss , Pp 101202- (2022)
For reducing the radiological hazard, Co-free hardfacing alternatives have been used to replace the traditional Co-based hardfacing alloys in nuclear power plant applications. However, manufacturing a defect-free Co-free hardfacing is challenging. Re
Externí odkaz:
https://doaj.org/article/b56bcc7b3e9e4d3e8a0b1c4cc736611c
Autor:
Matias Ahonen, Roman Mouginot, Teemu Sarikka, Sebastian Lindqvist, Zaiqing Que, Ulla Ehrnstén, Iikka Virkkunen, Hannu Hänninen
Publikováno v:
Metals, Vol 10, Iss 3, p 421 (2020)
Dissimilar metal welds (DMWs) are a key design feature in nuclear power systems, typically involving ferritic low-alloy steels (LAS), stainless steels (SS), and nickel-base alloys. They are, however, a potential concern regarding the structural integ
Externí odkaz:
https://doaj.org/article/5056062ea5f1493482138014e4fe9544
Autor:
Suvi Papula, Mingshi Song, Aaron Pateras, Xiao-Bo Chen, Milan Brandt, Mark Easton, Yuriy Yagodzinskyy, Iikka Virkkunen, Hannu Hänninen
Publikováno v:
Materials, Vol 12, Iss 15, p 2468 (2019)
Additive manufacturing (AM) is a rapidly growing field of technology. In order to increase the variety of metal alloys applicable for AM, selective laser melting (SLM) of duplex stainless steel 2205 powder and the resulting microstructure, density, m
Externí odkaz:
https://doaj.org/article/9979cbdbfa9b495ebad06d1607d19811
Publikováno v:
Materials, Vol 10, Iss 6, p 613 (2017)
Susceptibility of three lean-alloyed ferritic-austenitic stainless steels to hydrogen-induced delayed cracking was examined, concentrating on internal hydrogen contained in the materials after production operations. The aim was to study the role of s
Externí odkaz:
https://doaj.org/article/0a14d81eead948749c6440a3bb0a9999
Autor:
Heikki Keinänen, Juha Kuutti, Noora Hytönen, Pekka Nevasmaa, Caitlin Huotilainen, Iikka Virkkunen, Suprit Bhusare, Aloshious Lambai, Gaurav Mohanty
Publikováno v:
Keinänen, H, Kuutti, J, Hytönen, N, Nevasmaa, P, Huotilainen, C, Virkkunen, I, Bhusare, S, Lambai, A & Mohanty, G 2022, Effect of Welding Direction and Bead Pattern in Alloy 52 / SA508 Repair Weld . in ASME 2022 Pressure Vessels & Piping Conference : Materials and Fabrication . vol. 4B, PVP2022-84662, American Society of Mechanical Engineers (ASME), ASME 2022 Pressure Vessels and Piping Conference, PVP 2022, Las Vegas, United States, 17/07/22 . https://doi.org/10.1115/PVP2022-84662
As nuclear power plants age and their lifetimes are being extended, the possibility and need to perform repairs of safety critical and hard to replace components is ever increasing. For example, defects in the reactor pressure vessel caused by exposu
Autor:
Juha Kuutti, Iikka Virkkunen
Publikováno v:
Fatigue & Fracture of Engineering Materials & Structures. 43:3063-3067
Publikováno v:
Koskinen, T, Kuutti, J, Virkkunen, I & Rinta-aho, J 2021, ' Online nonlinear ultrasound imaging of crack closure during thermal fatigue loading ', NDT & E International, vol. 123, 102510 . https://doi.org/10.1016/j.ndteint.2021.102510
Funding Information: This paper was funded by the Finnish radiation safety program SAFIR2022 . Trueflaw contributed the thermal fatigue cycle for the flaw. All contributions are greatfully acknowledged. Publisher Copyright: © 2021 The Authors A ther
Publikováno v:
Virkkunen, I, Koskinen, T & Jessen-Juhler, O 2021, ' Virtual round robin – A new opportunity to study NDT reliability ', Nuclear Engineering and Design, vol. 380, 111297 . https://doi.org/10.1016/j.nucengdes.2021.111297
Funding Information: The research was funded by The Finnish Research Programme on Nuclear Power Plant Safety 2019 – 2022 (SAFIR-2022). Funding Information: The flawed and unflawed mock-ups for this study were provided by SQC, EPRI and PNNL. The man
Publikováno v:
Siljama, O, Koskinen, T, Jessen-Juhler, O & Virkkunen, I 2021, ' Automated Flaw Detection in Multi-channel Phased Array Ultrasonic Data Using Machine Learning ', Journal of Nondestructive Evaluation, vol. 40, no. 3, 67 . https://doi.org/10.1007/s10921-021-00796-4
Modern ultrasonic inspections utilize ever-richer data-sets made possible by phased array equipment. A typical inspection may include tens of channels with different refraction angle, that are acquired at high speed. These rich data sets allow highly
Autor:
Ryan M. Meyer, Aimee E. Holmes, Romarie Morales, Iikka Virkkunen, Thiago Seuaciuc-Osorio, Bruce Lin
Publikováno v:
2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation.
This paper presents efforts to overcome challenges with empirical probability of detection (POD) estimations in the nuclear power industry through the utilization of a novel virtual flaw method. A virtual round robin (VRR) study was conducted under t