Oxide-layer formation on a nickel based alloy using laser surface melting – Experimental and numerical study of the laser-metal interaction

Gouton, Lucille; Dal, Morgan; Aubry, Pascal; Maskrot, Hicham; Caron, N.; Pacquentin, Wilfried; Foucault, M.; Peyre, Patrice; Favier, Véronique

doi:10.2351/1.5063201

Cited by 1 publication

(2 citation statements)

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“…Since the melting temperatures of TiC and TiN are respectively Tm = 3067 • C and Tm = 2950 • C [53] their disappearance strongly hints to the fact that the temperature went up beyond these thresholds for laser energy densities above 4.3 J/cm 2 . Such values are indeed confirmed by preliminary modelling results [59].…”

Section: Discussionsupporting

confidence: 79%

“…Alloy 690 is an austenitic nickel based alloy used as material for steam generator tubes in nuclear power plants because of its good formability, good mechanical properties at high temperature and high resistance to stress corrosion cracking [1]. One of the main issues to overcome in pressurized water reactors (PWR) is the induced radioactive dose where deposited activities are mainly caused by 58 Co and 60 Co which are respectively the neutron activated compounds of 58 Ni and 59 Co. Indeed in a primary coolant environment alloy 690 releases nickel ions [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Laser surface melting of nickel-based alloy reduces nickel release in the primary cooling system of a nuclear power plant

Pacquentin

Gouton

Caron

et al. 2021

Optics & Laser Technology

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The surface of Ni-based alloy 690 was treated using a sub-microsecond pulsed laser in order to reduce the amount of nickel released when the surface is exposed to the primary cooling system of pressurized water nuclear reactors. A 2D array of laser treatment parameter sets was investigated. The results on sample surfaces was characterized using interferometric microscopy, Scanning Electron Microscopy (SEM), Glow Discharge Optical Emission Spectrometry (GDOES) and X-ray Photoelectron Spectrometry (XPS). The treatment leading to a continuous and defect-free chromine surface having the minimum nickel content over about the first two nanometers and no subsurface chromium depletion was selected for the nickel release test. This selection criterion proved to be very efficient as the total amount of nickel released in a standard qualification test using a simulated primary coolant was reduced, compared to a non-treated surface, by a factor of 7 during the heating phase and by a factor of 3.7 on average over the whole month-long test.

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Section: Discussionsupporting

confidence: 79%