THE METHODOLOGY FOR ESTIMATING THE EFFECT OF ALUMINUM CONTENT ON THE TOUGHNESS AND OTHER MECHANICAL PROPERTIES OF LOW CARBON STEELS
In the article presents the methodology and results of estimating the effect on the mechanical properties found currently in wide use in the engineering of low-carbon steels (TRIP steels) contained aluminum. For this purpose, conducted mechanical testing of a number of trip-steels on uniaxial tensile tests, impact strength, as well as determined by their hardness and toughness. As a result of mechanical tests for each test sample obtained dependence of strength and ductility, toughness and stamina from the content in the steel aluminum. The data analysis shows the following dependencies. The highest strength (sВ = 853,42 MPa) are observed in the investigated steels with the highest aluminum content. However, these steels are characterized by the decrease of the characteristics of plasticity (δ = 19,459 %; φ = 52,16 %). On the other hand, the highest ductility (δ = 21,622 %; φ = 69,75 %) is observed in steel, which in turn is characterized by the lowest strength (sВ = 788,35 MPa). The results of the hardness of the investigated steels are in qualitative agreement with the pattern of change in strength. From the point of view of providing maximum performance optimum toughness can be considered as the aluminum content in the steel 0,062 %, as an integral indicator of the mechanical characteristics, namely the work of destruction, has in this case the maximum value. Determined that unlike other mechanical characteristics of the change in the aluminum content in the present limits of endurance of the investigated steels is practically not affected.