Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 1

Laser alloying of 316L steel with boron using CaF2 self-lubricating addition

10.15199/28.2016.1.1

nr katalogowy: 96770
10.15199/28.2016.1.1

Good resistance to corrosion and oxidation of austenitic 316L steel is well-known. Therefore, this material is often used wherever corrosive media or high temperature are to be expected. However, under conditions of appreciable mechanical wear (adhesive or abrasive), this steel have to characterize by suitable wear protection. The diffusion boronizing can improve the tribological properties of 316L steel. However, the small thickness of diffusion layer causes the limited applications of such a treatment. In this study, instead of diffusion process, the laser boriding was used. The external cylindrical surface of base material was coated by paste including amorphous boron and CaF2 as a self-lubricating addition. Then the surface was remelted by laser beam. TRUMPF TLF 2600 Turbo CO2 laser was used for laser alloying. The microstructure of remelted zone consisted of hard ceramic phases (iron, chromium and nickel borides) located in soft austenite. The layer was uniform in respect of the thickness because of the high overlapping used during the laser treatment (86%). The obtained composite layer was significantly thicker than that-obtained in case of diffusion boriding. The remelted zone was characterized by higher hardness in comparison with the base material. The significant increase in wear resistance of laser-borided layer was observed in comparison with 316L austenitic steel which was laser-alloyed without CaF2. Key words: laser boriding, self-lubricating addition, microstructure, hardness, wear resistance.1. INTRODUCTION AISI 316L austenitic stainless steel is well-known for its good corrosion resistance as well as good resistance to high temperature. It results from a single-phase austenitic microstructure as well as from an effective balance of carbon, chromium, nickel and molybdenum content. Therefore, this steel is often used wherever a high temperature or aggressive corrosive media occur. However, this material is characterized by l[...]

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