Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 4

Laser boriding of carburized steel

nr katalogowy: 57135

Boriding being a thermochemical process is widely used for boridetype coating. This process generally results in the formation of FeB and Fe2B needle-like microstructure at the surface. The presence of iron borides formed on the steels surfaces increases largely their hardness (up to 2000 HV), wear resistance and corrosion resistance [1÷7]. The main disadvantage of boriding is the brittleness of borided layers, especially of FeB boride [3, 5, 7]. There are several factors that cause the brittleness of borided layers: first, the FeB and Fe2B have high hardness; second, a large hardness gradient exists between the borided layer and the substrate. Many methods can decrease the brittleness of the boride layers. Three main are: obtaining a single-phase Fe2B layer [6, 7]; the production of multicomponent and complex borided layers [8÷17] and laser heat treatment (LHT) after boriding [18÷26]. The borocarburizing process [12÷16, 27] leads to the formation of multicomponent layers (B-C) by tandem diffusion processes: precarburizing and boriding. These layers are characterized by improved properties, especially increased abrasive wear resistance and increased low-cycle fatigue strength in comparison with typical borided layers. In recent years, laser technology has been widely used in many processes: the heating of materials by laser beam, laser heat-treatment (LHT), laser welding, laser overlaying, laser alloying and synthesis of materials by laser beam [28, 29]. The laser boriding process has been widely developed [30÷33], too. In this paper the laser alloying by boron was used in order to formation of gradient boride layers. The laser boriding, instead of diffusion process, was carried out after diffusion carburizing. The microstructure, microhardness profiles and abrasive wear resistance were investigated and compared with these properties obtained in the case of typical borided or borocarburized layers. EXPERIM ENTAL PROC EDUR E [...]

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