Functional Surfaces via Laser Processing in Nickel Acetate Solution

This study presents a novel laser processing technique in a liquid media to enhance the surface mechanical properties of a material, by thermal impact and micro-alloying at the subsurface level. An aqueous solution of nickel acetate (15% wt.) was used as liquid media for laser processing of C45E ste...

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Bibliographic Details
Published in:Materials 2023-04, Vol.16 (8), p.3087
Main Authors: Stanciu, Elena Manuela, Pascu, Alexandru, Croitoru, Cătălin, Roată, Ionut Claudiu, Cristea, Daniel, Tierean, Mircea Horia, Hulka, Iosif, Petre, Ioana Mădălina, Mirza Rosca, Julia Claudia
Format: Article
Language:English
Subjects:
Ablation
Acetates
Alloys
Aqueous solutions
Cavitation
Chemical composition
Coatings
Corrosion and anti-corrosives
Corrosion rate
Corrosion resistance
Heat
Laser processing
Lasers
Mechanical properties
Microalloying
Microhardness
Modulus of elasticity
Nickel
Phase transitions
Plasma
Pulsed lasers
Robot arms
Stainless steel
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Summary:This study presents a novel laser processing technique in a liquid media to enhance the surface mechanical properties of a material, by thermal impact and micro-alloying at the subsurface level. An aqueous solution of nickel acetate (15% wt.) was used as liquid media for laser processing of C45E steel. A pulsed laser TRUMPH Truepulse 556 coupled to a PRECITEC 200 mm focal length optical system, manipulated by a robotic arm, was employed for the under-liquid micro-processing. The study's novelty lies in the diffusion of nickel in the C45E steel samples, resulting from the addition of nickel acetate to the liquid media. Micro-alloying and phase transformation were achieved up to a 30 µm depth from the surface. The laser micro-processed surface morphology was analysed using optical and scanning electron microscopy. Energy dispersive spectroscopy and X-ray diffraction were used to determine the chemical composition and structural development, respectively. The microstructure refinement was observed, along with the development of nickel-rich compounds at the subsurface level, contributing to an improvement of the micro and nanoscale hardness and elastic modulus (230 GPa). The laser-treated surface exhibited an enhancement of microhardness from 250 to 660 HV and an improvement of more than 50% in corrosion rate.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16083087