Laser Processing of Ni-Based Superalloy Surfaces Susceptible to Stress Concentration

Reliable and resilient constructions are basic for ensuring the safety of various structures. The superalloys are used as constructive materials due to their superb mechanical properties and endurance. However, even these materials can have certain areas where the stress concentration is higher than...

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Bibliographic Details
Published in:Metals (Basel ) 2021-05, Vol.11 (5), p.750
Main Authors: Rajčić, Boris, Petronić, Sanja, Čolić, Katarina, Stević, Zoran, Petrović, Ana, Mišković, Žarko, Milovanović, Dubravka
Format: Article
Language:English
Subjects:
Accuracy
Alloys
Calibration
Corrosion
Deformation
Diamond pyramid hardness
digital image correlation (DIC) method
Drilling
Gas turbine engines
Laser processing
Lasers
Mechanical properties
Metal fatigue
Microcracks
Microscopy
Neodymium lasers
Nickel base alloys
Nimonic 263 alloy
Nimonic alloys
Resilience
Semiconductor lasers
Software
Strain gauges
Stress concentration
Superalloys
surface modification
Surface treatment
Topography
YAG lasers
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Summary:Reliable and resilient constructions are basic for ensuring the safety of various structures. The superalloys are used as constructive materials due to their superb mechanical properties and endurance. However, even these materials can have certain areas where the stress concentration is higher than expected, such as drilling holes, which are common in various structures that need additional enhancement. Surface laser modifications of the areas surrounding the holes drilled in Nimonic 263 sheets are done by pulsed picosecond and nanosecond Nd:YAG laser irradiations with pulse durations of 170 ps and ≤8 ns, respectively. Following the laser surface treatment, the effectiveness of the enhancement was analyzed by the microhardness test and the deformation test. The results show that the deformation and stress values are decreased by 25−40 percent, showing the improvement in the resilience to deformation. The Vickers microhardness test results indicate an improvement in the Nimonic 263 microhardness. The dimensions of the microcracks are higher for the untreated material in comparison to the laser-treated material.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11050750