Study of the Rotary Bending Fatigue Resistance of 30MnB5, 41CrS4 and 30MnVS6 Steels

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.

A review on isothermal rotating bending fatigue failure: Microstructural and lifetime modeling of wrought and additive manufactured alloys

“…Additionally, porosities can be found in the area of the final fracture. Porosities have the potential to develop in this scenario because of the micro void coalescence (MVC) mechanism that occurs during fracture 17,123,124 . Figure 29 illustrates some of the final voids that can be found in the coarsened final fracture area of bearing steel 123 …”

“…The final fracture surface SEM of steel alloy with MVC final porosities, 123 red circles showing the micro‐voids in the final fracture area. [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…17,123,124 Figure 29 illustrates some of the final voids that can be found in the coarsened final fracture area of bearing steel. 123 F I G U R E 2 8 Rotated bending fatigue results. (A) Oxide inclusion in the fracture surface of specimen; (B) titanium nitride inclusion in the fracture surface of specimen.…”