Enhanced wear resistance by compressive strengthening: A novel combination of laser and ion implantation technology

Abstract

In general, neon implantation is not very effective in reducing wear rates. However, neon implantation into laser-melted steel turns out to reduce the wear rate substantially as a result of a conversion of residual tensile stresses into compressive ones. Nitrogen implantation, on the other hand, at a high dose of 3×1017 ions/cm2 at 90 °C exhibits a deleterious effect on the wear performance. A brittle layer of ε-Fe2(C,N)1−x nitrides is formed. At a lower dose of 1×1017/cm2 or implantation of nitrogen at 150 °C, the wear rate is also reduced.

Nitridation of iron by CW-CO2 laser nitriding technologies

“…Nitridation of iron has been a subject of great importance in the context of diversified applications in mechanical industry, because nitridation is known to modify such properties as wear resistance, friction, corrosion, fracture toughness, micro-hardness, and so on, significantly [1][2][3][4][5]. There are many methods for nitriding, for example salt bath nitriding [6], reactive magnetron sputtering [7], plasma nitriding [8], plasma immersion ion implantation [9] and laser nitriding [3,[10][11][12][13].…”

Reduction of the tensile stress state in laser treated materials

“…In this work a novel method is presented which inverts the tensile stress while maintaining the advantages of the laser treatment. In previous work [7], implantation of a noble gas was used as a remedy against the residual tensile stresses. Here shot peening is introduced that has several advantages over implantation: the influenced layer is thicker (75 ~tm compared to 0.1 ~tm), and the technique is more effective since shot peening results in a compressive residual stress state whereas implantation only reduces the tensile stress.…”