Effect of interlamellar spacing on the elastoplastic behavior of C70 pearlitic steel: Experimental results and self-consistent modeling

Abstract

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Microstructure of Hot Rolled 1.0C-1.5Cr Bearing Steel and Subsequent Spheroidization Annealing

“…The pearlite interlamellar spacing (k) was measured by a circular line method, which was described in the work by Yahyaoui et al [20] The prior austenite grain size and pearlite colony size were measured by the line intercept method. Note that the prior austenite grain boundaries were determined according to the distribution of proeutectoid carbide.…”

Influence of Microstructure on Strength and Ductility in Fully Pearlitic Steels

“…Pearlitic steels exhibit an increasing yield stress with lowering interlamellar spacing in such a manner that a Hall-Petch type equation can be fitted to reproduce the relationship between microstructure and strength [1][2][3][4][5][6][7][8][9][10][11]. However, in some materials, such as cold-drawn pearlitic steel wires, the orientation of microstructure (ferrite and cementite lamellae almost fully oriented in the drawing direction) makes the classical Hall-Petch fitting not applicable, as shown in [12], and only a modified Hall-Petch relationship between yield stress and pearlite interlamellar spacing is applicable, as demonstrated in a more recent paper [13].…”

“…While the coarse pearlite is deformed in a non-homogeneous manner (exhibiting localized plastic strain in the form of narrow slip bands), thin pearlite shows a much more uniform strain distribution [15,17,18]. In addition, when pearlitic microstructures are considered, plastic strain generates compressive residual stresses in the ferrite and tensile stresses in the cementite, in such a manner that the level of residual stresses is higher in steels with greater interlamellar spacing [10]. When one performs standard tensile tests, the fracture micromechanisms are controlled by physical processes taking place in those colonies containing pearlite lamellae parallel to the tensile axis, where the deformation occurs in narrow bands of locally intense shear stress [11].…”

Study of Stress Partitioning in a 0.68 wt%C Pearlitic Steel Using High Energy X-Ray Synchrotron Radiation

“…The role of the microstructure and specially the interlamellar space in the mechanical behavior and fatigue resistance of pearlitic steels has been studied in previous works [1,2]. In-situ diffraction technique during mechanical loading is a powerful method to investigate the mechanical behavior of the phases and the stress partitioning between the cementite and the ferrite [2][3][4][5].…”

“…In-situ diffraction technique during mechanical loading is a powerful method to investigate the mechanical behavior of the phases and the stress partitioning between the cementite and the ferrite [2][3][4][5]. Only few results concerning the role of the lamellar cementite in the hardening of the fully pearlitic steel have been reported [1,2]. We propose in this study to apply to fully pearlitic steel an approach based on the analysis of the mechanical properties of the polycrystalline material at the grain and phase scale using synchrotron X-ray diffraction technique and elasto-plastic models.…”