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

• Published in: Materials & Design Vol. 55; pp. 888 - 897
• Main Authors: Yahyaoui, H., Sidhom, H., Braham, C., Baczmanski, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2014; Elsevier
• Subjects: Critical shear stress; Engineering Sciences; Materials; Mechanics; Pearlitic steel; Residual stress; Self-consistent model; X-ray diffraction; X-ray diffraction; Self-consistent model; Critical shear stress; Pearlitic steel; Residual stress
• ISSN: 0261-3069; 0264-1275
• DOI: 10.1016/j.matdes.2013.10.062

•The effect of the interlamellar spacing on pearlitic steel strength is studied.•Phase stresses are investigated using X-ray «in situ» tensile tests.•Ferrite plasticity parameters are identified by the self consistent model.•The effect of the interlamellar spacing on residual stress is studied. The effect of pearlite microstructure characteristics on strength and deformation of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stress induced by plasticity. Tests have been carried out on two pearlitic microstructures with interlamellar spacing Sp=170 and 230nm respectively. Ferrite critical shear stresses (τc0(α)) are equal to 75–86MPa for interlamellar spacing Sp=230nm and 105–120MPa for interlamellar spacing Sp=170nm. Moreover, the compressive residual stress measured in ferrite phase is higher in elasto-plastically deformed sample (total strain of E11=1.2%) having larger interlamellar spacing (σFeαR=-161MPa for Sp=230nm and σFeαR=-77MPa for Sp=170nm).