Abstract

PEREIRA F, Juan C; CANDEL B, Juan J; AMADO P, José M  and  AMIGA³ B, Vicente. Geometric and microstructural analysis of laser clad nicocralyta coating on stainless steel aisi 316l . Rev. LatinAm. Metal. Mater. [online]. 2014, vol.34, n.2, pp.209-217. ISSN 0255-6952.

In this work, the NiCoCrAlYTa Alloy was deposited by laser cladding with different processing parameters (flow rate of powder supplied, feed speed and laser power), in order to analyze the effects of processing on the geometry, microstructure and properties of the coating. We have measured the dimensions of the tracks by optical microscopy and computer image analysis. Scanning electron microscopy (SEM) and energy dispersive spectroscopy microanalysis (EDS) have been used to analyze the microstructure, chemical composition and microhardness variations. The coatings exhibit good geometric aspect ratio without cracks and macro pores, and a good metallurgical bond with the substrate through the dilution zone was obtained; yet there is no a homogeneous columnar dendrite structure that depends on the processing laser. It has been observed that the surface hardness of the coating is twice that of the substrate hardness. The EDS microanalysis evidenced the dilution and mixing of relevant chemical elements such as Fe, Co, Al and Ta with Ni-Cr, generating a gradual variation between substrate and coating which influences the hardening observed at the interface.

Keywords : NiCoCrAlYTa; laser cladding; coating; AISI 316L.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )