Abstract
Currently, the stainless steel starts to widen its fields of application in an extraordinary way in medicine and surgery, in the domestic utensils (flatware) and in heavy industry (petrochemistry, nuclear industry and transport). This work consists of making an experimental study on a type of ferritic stainless steel having undergone the test of the microindentation at controlled load and knowing the Superficial Tribological Transformations (STT) caused by this test. It is supposed that it is a simulation with the damages caused on the stainless steels which are in the environment (the effect of hail) or in industry (shot-blasting of the turbines). The analysis of the repeated shocks is based on the mechanical characterization (microhardness, microstructures of the impacts) and geometrical to see the evolution of the diameter and depth of the impacts according to the number of shocks (cycles of impact), in order to know the plastic deformation.
Highlights
The lifespan of a mechanical set depends on the lifespan of each of its elements, which are submitted in service to a state of complex stresses in the time
In order to study the mechanical behavior in cyclic fatigue of the ferritic stainless steel, initially, it is necessary to determine the extent of the security zone of the field of plasticity where the rupture does not occur even after a high number of cycles
The effect of the shocks repeated by microindentation caused physicochemical and metallurgical transformations under the effect of the kinetic energy, such as the lack of texture and the variation of the microhardness
Summary
The lifespan of a mechanical set depends on the lifespan of each of its elements, which are submitted in service to a state of complex stresses in the time (for example: external disturbances, vibrations). A material submitted to repeatedly mechanical solicitations can break prematurely, even if the levels of constraints reached are lower than those supported in monotonous loading: it is the phenomenon of tiredness. In order to study the mechanical behavior in cyclic fatigue of the ferritic stainless steel, initially, it is necessary to determine the extent of the security zone of the field of plasticity where the rupture does not occur even after a high number of cycles. It is necessary to characterize the evolution of the geometry and the microhardness of the prints carried out by the shocks repeated with an aim of limiting their effects, by adjusting the parameters of development and extending the security zone [1-7].
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