In this study, a comparative analysis of the fatigue behavior of four types of steels, three of quenching and tempering (30MnB5 subjected to two different heat treatments and 41CrS4) and one microalloyed (30MnVS6), was carried out. The objective of the study is to determine if it is feasible to replace the quenching and tempering steel traditionally used in the manufacture of commercial vehicle axles (30MnB5) with alternative ones with the same composition but with modifications in their microstructure that improve their mechanical properties; a quenched and tempered chromium steel (41CrS4) and one that is microalloyed (30MnVS6). For this, rotary-bending fatigue tests have been carried out on the four types of steels with different stress levels. The fatigue resistance of quenched and tempered steels and microalloyed steel was evaluated using the fit of Basquin’s experimental data. Where possible, the fatigue limit was determined using the maximum likelihood method. It was concluded that, in general, the fatigue resistance of chromium-alloyed steel is higher than that of the reference steel, while the rest have lower fatigue resistance. On the other hand, it was determined that the fatigue limit of microalloyed steel is higher than the reference one and that of the reference steel is higher than that of the other two steels.

is a civil engineer with MSc and PhD degrees. After working for almost seven years in a private company and developing projects for the construction of linear infrastructures, in November 2007, she began to develop her professional career at the School of Civil Engineering of the Universidade da Coruña (UDC), where she is an Assistant Professor.She teaches subjects from the area of engineering and transportation infrastructure, including those related to the layout of roads, pavements, and traffic. Her research focuses on the design and analysis of sustainable materials for road pavements (half-warm mix asphalt, cold mix asphalt, etc.). She published 31 papers indexed in the JCR (16 Q1).