Laser modification of detonation-gun sprayed ferro-boron coatings on AISI 304L SS

Abstract

This study reports the synthesis of Ferro boron coatings deposited over AISI 304L austenitic stainless steel substrate using D-Gun (Detonation gun) technique. The microstructure, adhesion and wear properties of the coating were investigated using X-ray diffraction, optical microscopy, scanning electron microscopy, micro-hardness measurements and pin-on-disc wear tests. Hardness of the coated surface was found to increase from 350 HV to about 1600 HV on laser modification. The effect of laser treatment on the microstructural modification of coating is also described.

The effect of different powder mixtures used in the boriding process on the surface properties of AISI 304 stainless steel material

“…Boridation of ferrous materials results in the formation of single (Fe 2 B) or double (FeB/Fe 2 B) layers with a well-defined composition [15,17,18]. The boriding process is known for relatively rapid diffusion depending on the time and temperature and significantly higher mechanical properties than other thermochemical processes, and therefore it has technological importance [16,[19][20][21][22]. The thickness of the boriding layer formed after the boriding process depends on the temperature, processing time, type of substrate material and boron potential conditions surrounding the material surface [23,24].…”

Improvement in wear and corrosion resistance of AISI 1020 steel by high velocity oxy-fuel spray coating containing Ni-Cr-B-Si-Fe-C

“…The high temperature processing can also lead to difficulties associated with oxidation of surface as well as distortion of components [8]. Another constraint is that for applications requiring a modified case thickness in excess of 100 µm, thermo-chemical processes would not be feasible for industrial applications [9].…”