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Functional Surfaces via Laser Processing in Nickel Acetate Solution.

Elena Manuela Stanciu1, Alexandru Pascu1, Cătălin Croitoru1

  • 1Materials Engineering and Welding Department, Transilvania University of Brasov, Eroilor 29 Str., 500036 Brasov, Romania.

Materials (Basel, Switzerland)
|April 28, 2023
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Summary
This summary is machine-generated.

This study introduces a novel laser processing method using nickel acetate solution to enhance C45E steel. The technique improves surface hardness and corrosion resistance through subsurface micro-alloying.

Keywords:
diffusionlaser treatmentliquid mediamicroalloyingmicrostructuresurface hardening

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Laser Processing

Background:

  • Enhancing surface mechanical properties is crucial for material durability.
  • Traditional surface treatments can be limited in achieving subsurface modifications.
  • Laser processing offers precise control over material modification.

Purpose of the Study:

  • To develop and evaluate a novel laser processing technique in liquid media for C45E steel.
  • To investigate the effects of nickel micro-alloying on subsurface properties.
  • To enhance the surface mechanical properties and corrosion resistance of C45E steel.

Main Methods:

  • Laser processing of C45E steel using a pulsed laser in an aqueous nickel acetate solution (15% wt.).
  • Utilizing a robotic arm and a specific optical system for under-liquid micro-processing.
  • Analysis of surface morphology, chemical composition, and structural development using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction.

Main Results:

  • Achieved micro-alloying and phase transformation up to a 30 µm depth.
  • Observed microstructure refinement and formation of nickel-rich compounds at the subsurface.
  • Significantly improved microhardness (from 250 to 660 HV 0.03) and elastic modulus (230 GPa).
  • Demonstrated over 50% improvement in corrosion rate resistance.

Conclusions:

  • The novel under-liquid laser processing technique effectively enhances the surface mechanical properties of C45E steel.
  • Subsurface nickel micro-alloying is a viable method for improving hardness, elastic modulus, and corrosion resistance.
  • This technique offers a promising approach for advanced surface engineering applications.