Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Influence of laser parameters on microstructure and microhardness of boronickelized layer

nr katalogowy: 79730

Surface layer modification is performed in order to improve certain properties [1, 2]. Methods of increasing surface hardness include: thermochemical diffusion treatment [3, 4], galvanic treatment and laser heat treatment [5, 6]. In general, diffusion methods used to harden the surface of steels include carburizing, nitriding and boriding. Currently, the complex layers are formed by combining different treatments [7÷18]. Diffusion boronizing is a method of thermochemical treatment involving saturation of steel surface layer with boron. Boronizing, being a thermochemical diffusion treatment, can be applied to a wide range of steels including: plain carbon, low alloy, tool and stainless. As a result, boron-iron compounds called borides are formed: FeB and Fe2B [3, 4]. The borides have a needle-like structure and average hardness of up to 2000 HV. A major disadvantage of these layers is brittleness within the subsurface zone (FeB) that perhaps manifests itself as peeling from the core [3, 4]. There are several factors that cause brittleness of borided layers. One is a large hardness gradient existing between the borided layer and a substrate. Also, laser heat treatment (LHT) after boriding has a positive influence in this regard [4]. Nickel plating process carried out before boriding can lessen brittleness of boride layers. Nickel plating is a widely used process of galvanic treatment for various machine parts. In this paper the influence of scanning rate and laser power on microstructure and microhardness of boronickelized layer are presented. Characterization of single laser tracks formed on boronickelized layer for different laser parameters, i.e. power and scanning rate, is presented. Microstructure and microhardness after boronickelizing and laser heat treatment are discussed. EXPERIMENTAL PROCEDURE C45 steel was used for investigations. The tests were carried out on C45 steel of the following chemical composition: 0.42% [...]

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