Defining a relationship between pearlite morphology and ferrite crystallographic orientation. (1st May 2017)

• Record Type: Journal Article
• Authors: Durgaprasad, A.; Giri, S.; Lenka, S.; Kundu, S.; Mishra, S.; Chandra, S.; Doherty, R.D.; Samajdar, I.
• Is Part Of: Acta materialia. Volume 129(2017)
• Page Start: 278
• Page End: 289
• Publication Date: 2017-05-01
• Subjects: Pearlite -- Volume change -- Texture -- EBSD -- Residual stress; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.02.008
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: This study involved fully pearlitic wires of seven different diameters (5.5–1.6 mm). All samples were laboratory annealed to re-austenitize and were then air-cooled to reform the pearlite structure. Morphological alignment of the pearlite, along the wire axis, improved significantly, 32% to 93%, as the wire diameter decreased. This improvement coincided with increases in the <110> ferrite fiber texture, and falls in the axial residual stresses. In all the wires, the majority of the pearlite lamellae appeared to align, in a 2-D analysis, with minimum elastic stiffness (EMin under simple compression) for the ferrite (α). This correlation increased from 80% to 98% with decrease in wire diameter and fall in axial residual stresses. 3-D microstructures by serial sectioning, 3-D rotations seeking EMin and observations on coarse pearlite, indicated that {011}α and <001> α were, respectively, the pearlite interface (or habit plane) and growth direction. Graphical abstract: Image 1