Mitigating environmental assisted cracking in heterogeneous welds by laser peening without coating

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F25%3AN0000074" target="_blank" >RIV/26722445:_____/25:N0000074 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/25:00601810
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1350630724010288" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1350630724010288</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.engfailanal.2024.108982" target="_blank" >10.1016/j.engfailanal.2024.108982</a>

Result language
angličtina
Original language name
Mitigating environmental assisted cracking in heterogeneous welds by laser peening without coating
Original language description
In this work Laser Peening without Coating (LPwC) was applied underwater on heterogeneous weld joint made of P265GH and X6CrNiTi18-10 steel tubes to prevent Environmental Assisted Cracking on the weld/P265GH steel fusion boundary. Special laser head was designed to precisely deliver 200 mJ green laser beam on the centrally located weld interface on the inner surface of a pipe 76 mm wide and 420 mm long. Residual stress analysis revealed that the LPwC treatment led to generation of compressive residual stresses in the critical fusion boundary area with the magnitude of −168 MPa despite the absence of a protective layer in the peening process. The depth of compressive stresses reached up to 0.8 mm. Plastic deformation induced by LPwC led to grain refinement in the microstructure and improved hardness by 16 %. Samples sectioned from the treated pipe were subjected to accelerated corrosion-mechanical testing which showed more than 2.5x increase in cycles to failure after LPwC. Fractography analysis showed shorter length and decreased number of corrosion cracks after LPwC as well as formation of protective oxide layer on top of the treated surface. 3-point bend testing further showed more than 8x increase in corrosion fatigue life.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/EH22_008%2F0004573" target="_blank" >EH22_008/0004573: Breakthrough Laser Technologies for Smart Manufacturing, Space and Bio-Tech Applications</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)