Abstract
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.
Highlights
The automotive industry is undoubtedly one of the most important industries today.This industry has a vital influence on the internal economy of both European and Asian countries, constituting an important factor in increasing employability [1,2]
Fitting the S-N curves using the Basquin method is equivalent to expressing the fatigue strength as a straight line of slope b in the S-N diagram represented in logarithmic scale: S = ANb logS = b × logN + C, donde C = logA
For the 30MnB5-B1 steel, four specimens were tested at the 60% Re level (511 MPa), of which two did not break
Summary
The automotive industry is undoubtedly one of the most important industries today This industry has a vital influence on the internal economy of both European and Asian countries, constituting an important factor in increasing employability [1,2]. In this industry great importance is attached to the selection of the materials used, determining this point both the production, use and maintenance costs, as well as the durability of the product [3,4]. It is required that they be made with materials that possess adequate mechanical properties of strength, rigidity and hardness, and a sufficiently high resistance to fatigue to avoid component failure [5]
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