The cold roller die process increases the tensile strength and decreases the ductility of steel wire. Annealing heat treatment is applied to restore mechanical properties, but this is a costly process. This research shows that it is possible to control the mechanical properties of ultra-low carbon steel wire inducing the Bauschinger effect and relieving residual steel stresses. The present study uses several pulleys to promote and control the Bauschinger effect magnitude through alternated cyclic bending. A Completely Randomized Design, a regression study, and the Akaike Information Criterion were used to understand the relationship between the quantity and diameter of pulleys and the influence on the magnitude of the Bauschinger effect. Statistical models showed that it is possible to have a maximum increase of 103% in uniform elongation and a maximum decrease of 14% in yield strength. An interaction between the factors studied in controlling the Bauschinger effect magnitude was confirmed.
Desenvolvimento de uma estufa microcontrolada via arduino para controle da temperatura e umidade do ar de microscópios ópticos
Development of a microcontrolled greenhouse via arduino to controlthe temperature and air humidity of optical microscopes
he Bauschinger Effect is a phenomenon that occurs in metals to reduce mechanical strength and increase ductility. It is generally considered a deleterious effect on the mechanical properties of steel. In this context, the objective of this paper is to present a bibliometric study, to demonstrate the evolution of research on this effect and the main methodologies used to characterize this metallurgical phenomenon in steels. For this, methodological procedures were followed from the survey of three hundred and seventy publications, in national and international journals related to the theme in the period between 1990 to 2021. Then, the data found were arranged in spreadsheets, to identify the main methodologies and results, serving as a basis for the analysis of the general research scenarios regarding the Bauschinger Effect in steels, for deepening in future studies.
Determinação das temperaturas de transformação AR1 e AR3 em barras de aço CA-50 laminadas a quente Determination of the transformation temperatures AR1 and AR3 for hot rolled CA-50 steel rebars
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