Abstract:

In this study, the machinability properties of laser treated S355JR samples with ZrB2 nanoparticles were investigated. The ZrB2 nanoparticles were synthesized by mechanochemical method and used for laser coating of highly preferred S355JR carbon steel surface by 2 kW CO2 laser. Then the coated samples were cut using the methods of abrasive water jet, wire-cut electrical discharge machining, laser, and abrasive disc, respectively. The phase structures and morphologies of the coated and cut surfaces were determined by using X-Ray diffractometry, optical microscope and scanning electron microscopy. The hardness was specified by using the microhardness device. It was found that the most suitable cutting method for laser coated S355JR steel by using ZrB2 nanoparticles was the method of cutting with abrasive disc having low heat input and minimal damage. In cutting with wire-cut electrical discharge machining the worn zone was in a very narrow range, but there was also some heat-affected zone. While no heat input was seen in the method of cutting with abrasive water jet, significant damages in the shear edges and peripheral zones were observed due to abrasive particles. Intensive thermal deformation was also observed in the method of laser cutting.

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