3D mapping of orientation variation and local residual stress within individual grains of pearlitic steel using synchrotron dark field X-ray microscopy

SCRIPTA MATERIALIA

卷:197

Article

Yildirim, C.¹  Jessop, C.²  Ahlstrom, J.²  Detlefs, C.¹  Zhang, Y.³ 

[1] European Synchrotron Radiat Facil, 71 Ave Martyrs,CS 40220, F-38043 Grenoble, France

[2] Chalmers Univ Technol, Dept Ind & Mat Sci, S-41296 Gothenburg, Sweden

[3] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark

关键词: Pearlitic steels;    Synchrotron radiation;    X-ray diffraction (XRD);    Residual stresses;   

DOI  :  10.1016/j.scriptamat.2021.113783

来源: Elsevier

【 摘 要 】

Assessing the local residual stress and orientation with nanometer resolution within embedded steel grains has remained challenging. Here we use an advanced synchrotron technique, dark field X-ray microscopy to map 3D lattice variations, including both the crystallographic orientation and lattice strain, within two pro-eutectoid ferrite grains in pearlitic steel. We found an orientation variation up to 0.5 degrees and compressive elastic strain up to 1.8 & times; 10 & minus;3 are present in the as-manufactured sample. There is no direct correlation between the measured compressive strain and lattice orientation. The origin of the variations and their influence on the manufacturing process and mechanical properties are discussed. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free