Gradient residual strain and stress distributions in a high pressure torsion deformed iron disk revealed by high energy X-ray diffraction. (15th March 2018)

• Record Type: Journal Article
• Authors: Todt, J.; Keckes, J.; Winter, G.; Staron, P.; Hohenwarter, A.
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 178
• Page End: 181
• Publication Date: 2018-03-15
• Subjects: High-pressure torsion -- Ultrafine grained microstructure -- Iron -- Synchrotron radiation -- Residual stresses; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: High energy X-ray diffraction is used to investigate for the first time the distribution of residual X-ray elastic stresses inside a high pressure torsion (HPT) deformed iron disk with a diameter and thickness of ~ 30 and ~ 8 mm, respectively. In the experiment, a dedicated conical slit system restricts the diffraction gauge volume in three dimensions to ~ 0.45 mm 3, which is then used to scan the bulk sample cross-section in a non-invasive manner. Pronounced residuals stress gradients with maximal tensile stresses of ~ 200 MPa are observed along radial and tangential directions and are correlated to the deformation gradient arising from HPT. Graphical abstract: Image 1