Abstract
This paper analyses how the microstructure of an eutectoid pearlitic steel affects its conventional mechanical properties (obtained by means of a standard tension test) and the associated micromechanisms of fracture. Results show how the yield strength, the ultimate tensile strength (UTS) and the ductility, increase as the continuous cooling rate rises, whereas on the other hand the strain at UTS decreases. The fracture surface exhibits more brittle features when the continuous cooling rate decreases, in such a manner that in the fracture process zone an increasing area appears where the pearlite lamellae can be detected and less regions of microvoids are observed.
Highlights
I n pearlitic steel, hardness and yield strength increase with decreasing interlamellar spacing following a Hall-Petch type relationship [1,2,3,4,5,6,7,8,9,10,11]
UMicrostructural analysis sing optical microscopy and scanning electron microscopy, the microstructure of pearlitic steels obtained by various heat treatments (Figs. 1 and 2) was observed
The diameter of the pearlite colony dC was measured by the intercept method [17], which consists of counting the number of grains intercepted by a straight line drawn at random along the micrograph, considering the line’s randomness and the randomness of the metallographic cut by means of statistical methods
Summary
I n pearlitic steel, hardness and yield strength increase with decreasing interlamellar spacing following a Hall-Petch type relationship [1,2,3,4,5,6,7,8,9,10,11]. Resistance in pearlite is controlled by processes that occur in the ferrite, the main role of the cementite lamellae (at low stresses) being to limit the slip distance in the ferrite [11]. Fracture in standard tensile test is determined by processes in the colonies having pearlite lamellae parallel to the tensile axis, where the deformation occurs in narrow bands of locally intense shear stress [11]. An analysis of the different micro-mechanisms involved in fracture by simple tension of the steels has been carried out
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