Notch suppression on martensitic stainless steels by Laser Shot Peening
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F23%3AN0000219" target="_blank" >RIV/26722445:_____/23:N0000219 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Notch suppression on martensitic stainless steels by Laser Shot Peening
Original language description
Most fatigue cracks initiate at defects (notch) that create stress concentrators and cause the weakness of the whole component. The notch effect causes an increase tensile stress at the notch tip and improves conditions for crack nucleation. Under fatigue loading, the notch effect causes a significant decrease in the fatigue life of a component. Detrimental stress distribution caused by notches can be eliminated by laser shock peening (LSP) due to its ability to induce compressive residual stresses which prevent crack initiation. The high cycle fatigue (HCF) tests were performed on martensitic stainless steel Böhler T552. The specimen type for HCF was of hourglass type with 5 mm diameter. Tested specimens were in 3 modifications: specimen with smooth surface without defect and peening, specimen with artificial defect (notch) in the middle of minimum diameter and specimen with notch, which was peened with LSP technology. LSP treatment was performed in HiLASE Center, with L2 system – Bivoj. The fatigue tests were performed on resonant testing machine (static preload 300 MPa, frequency 120 Hz and test temperature 22 °C). Fractographic analysis of the fracture surfaces was performed. The LSP increased the stress amplitude of fatigue strength more than three times on specimens with defect. Presented at 8thICLPRP conference, Gyeongju, Korea.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/TK05010007" target="_blank" >TK05010007: Advanced Surface Stress Improvement (SSI) technology for preventive maintenance of critical nuclear components</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů