Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 2

Gradient boride layers formed by diffusion processes and by laser modification of diffusion layers

nr katalogowy: 51425

Boriding is known in literature data as a thermochemical treatment that permits boride layers of good performance properties. The borided layers are characterized by many advantageous properties. The main ones are: a high hardness of iron borides, high abrasive wear resistance, advantageous profile of internal stresses, high heat resistance, high corrosion resistance in acid and alkaline solutions, high resistance to influence of liquid metals and alloys and high hardness at increased temperatures [1÷7]. There isn’t much information referring to the fatigue strength of borided layers. The influence of boronizing on the fatigue strength is ambiguous, because it depends on many factors: the boriding method, boriding parameters, chemical composition of borided steel, heat-treatment after boriding and defects of the layer [8]. An important defect of borided layers is their brittleness [3, 5, 7]. The frequent symptoms of this defect are: microcracks of these layers, chipping and spalling. There are several methods which can lessen the brittleness of boride layers. The three main ones are: the formation of single-phase Fe2B layers [6, 7], the production of multicomponent and complex borided layers (for example: carburized before boronizing, B-C-nitrided or boro-nitrided layers) [9÷18, 26] and laser heat-treatment (LHT) after boriding instead of throughhardening and tempering [19÷26]. The two last specified methods lead to the formation of the gradient boride layers. These la yers are characterized by a changeable microstructure and properties of the diffusion zone. In recent years, laser technology has been widely used in many processes: the heating of materials by laser beam, laser heat-treatment, laser welding, laser overlaying, laser alloying and synthesis of materials by laser beam [8]. In point of laser usage after boronizing, the interesting treatment is surface laser treatment. The examined gradient boride layers were [...]

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