Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2015 - zeszyt 2

Low-cycle fatigue strength of borocarburized 15NiCr13 steel

10.15199/28.2015.2.4

nr katalogowy: 90963
10.15199/28.2015.2.4

The high fatigue resistance of carburized layers is well known. Simultaneously, there is not much data referring to the fatigue strength of borided layers. Some papers showed the advantageous influence of borocarburizing process on fatigue performance. The resistance of borocarburized layers to the lowcycle fatigue was higher than the one characteristic of typical borided layer formed on medium-carbon steel. In this study, the two-step process: carburizing followed by boriding was used in order to form the borocarburized layer. The investigated material as well as the boriding parameters were adequately selected in order to improve the low-cycle fatigue strength. The borocarburized 15NiCr13 steel was examined. This material was selected because of its advantageous carbon concentration-depth profile beneath iron borides obtained after boriding. The gas boriding in N2-H2-BCl3 atmosphere consisted of two stages: saturation with boron and diffusion annealing, alternately repeated. This treatment was carried out in order to obtain a limited amount of the brittle FeB phase in the boride zone. The low-cycle fatigue strength of through-hardened borocarburized steel was comparable to that obtained in case of throughhardened carburized specimen, which was previously investigated under the same conditions. The advantageous carbon concentration-depth profile as well as limited amount of FeB phase had a positive influence on the low-cycle fatigue strength. Therefore, the fatigue performance of borocarburized layer could approach a limit obtained for carburized layer.1. INTRODUCTION Diffusion boriding being a thermochemical process is widely used for production of boride-type layer. This process results in the formation of FeB and Fe2B needle-like microstructure on the steel’s surface. The occurrence of iron borides increases to a high degree: hardness (up to 2000 HV), wear resistance and corrosion resistance [1÷7]. As for the main disadvantage of[...]

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