Effect of Combined Grinding–Burnishing Process on Surface Integrity, Tribological, and Corrosion Performance of Laser‐Clad Stellite 21 Alloys

Abstract

Herein, the influence of the grinding–burnishing on surface integrity, mechanical properties, and corrosion performance of Stellite 21 alloys coating deposited by laser cladding is investigated. The as‐clad specimens are first ground followed by further modification by ball burnishing at forces of 424 N and 509 N. Results show that the grinding–burnishing enhances surface finish by lowering Ra from 2.6 to 0.73 μm and Rz from 13 to 4.9 μm, respectively. Surface porosity is found to decrease from 3.8% to 0.9%. Hardness is increased from 609 HV to 702 HV, with a surface alteration as deep as 250 μm, while wear resistance increases by reducing worn volume from 4.15 to 2.95 mm3. Because of high hardness, the grinding–burnishing increases impact resistance by lowering indent depth by 20%. Grains flatten and surface undulations are remarkably reduced due to burnishing. Finally, grinding–burnishing at 509 N improves the corrosion resistance by increasing positive corrosion potential from −0.41 to −0.14 V and lowering corrosion current density from 6.34 × 10−4 A cm−2 to 2.19 × 10−5 A cm−2, as compared to grinding. This synergistic grinding–burnishing can be a plausible post‐treatment route for the laser‐clad alloys.

The Effect of Cold Rolling on the Corrosion Behaviour of 5083 Aluminium Alloys

“…), dislocation density, surface topography, generation of localized stresses and/or micro-defects can have a detrimental effect on the corrosion performance of a material that undergoes any forming process. This has been reported not only for aluminium alloys, but also for other extensively applied materials such as steels [24], magnesium [25] and cobalt-based [26] alloys. Thus, this research investigation focuses on the effect of cold rolling on the corrosion behaviour of 5083 aluminium alloy in a 3.5% NaCl solution.…”

Effect of slide burnishing on the corrosion resistance and surface roughness on high strength steels

“…33–35 However, there is an optimum burnishing force that will lead to the highest roughness reduction for each material, but an excessive high burnishing force can cause deterioration of the material surface finish. 36–40 For DP-330Y material, the lowest result of Ra, Rz, Rt, and Rp indicators were obtained with the burnishing force of 150 N, while the Rv indicator decreased even more with an increase of the burnishing force. For the burnishing force of 150 N, the roughness indicators enhanced around 73.4%, 53.8%, 50.2%, 70.6%, and 40.3% for Ra, Rz, Rt, Rp, and Rv, respectively.…”