Laser power effect on microstructure and property of laser cladding nickel based alloy coating

Dewei Deng, Jinhua Sun, Xinlin Wang, Hongchao Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

As to the cavitation that occurred in the high boron solution working medium for water-lubricated guiding bearing, the method of laser cladding was proposed to improve their surface properties. Ni40 alloy powder was cladded on the surface of 304 austenitic stainless steel by laser cladding, and then the effect of laser power on the microstructure and properties of the cladding layer was studied. 304 austenitic stainless steel was cladded by semiconductor laser, and a cladding layer with thickness of 0.8 mm was formed. The microstructure of samples was analyzed by optical microscopy(OM) and scanning electron microscopy(SEM), the cross-sectional hardness gradient of the cladding was measured by Vickers hardness, the abrasion of cladding layer was tested by wear testing machine, and the corrosion resistance testing was carried out in solution of boric acid. The experience results showed that Ni40 cladding layer was mainly composed of γ-Ni and chromium compounds. The different laser powers used in the experiment had influence on the structure size of the cladding layer and element distribution, but no influence on the phase constitution. Compared with the substrate, the hardness of cladding layer increased significantly and decreased with the laser power increasing. The thickness of cladding layer increased with the laser power increasing. During the friction and the wear process, the wear mass loss of cladding layer was about 1.5×10-2 g and declined with laser power increasing. And the corrosion resistance of cladding layer rose with the increase of laser power in the boric acid solution.

Original languageEnglish
Pages (from-to)20-25
Number of pages6
JournalXiyou Jinshu/Chinese Journal of Rare Metals
Volume40
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • Laser cladding
  • Laser power
  • Nickel-based alloy

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