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Effective X-ray Elastic Constant of Cast Iron
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
2017 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 4, p. 2766-2773Article in journal (Refereed) Published
Abstract [en]

X-ray diffraction is a non-destructive method used for strain measurements in crystalline materials. Conversion of strain to stress can be achieved using the X-ray elastic constants (XEC), s1 and ½s2. The sin2ψ method was used during in situ loading to determine XEC for flake, vermicular, and spherical graphite iron. A fully pearlitic steel was used as reference. Uniaxial testing was conducted on the cast iron to create a homogeneous strain field, as well as four-point bending in both tension and compression due to the tension/compression asymmetry. The commonly used XEC value ½s2 = 5.81 × 10−6 MPa−1 is theoretically derived from an α-Fe single crystal. When investigating materials that contain ferrite, such as polycrystalline cast iron, this value is not accurate. Determination of an effective XEC for polycrystalline cast iron yields a better correlation between the measured microstrains and the properties observed on a macroscopic scale. The need for an effective XEC is evident, especially when it comes to model validation of, for example, casting simulations. Effective XEC values have been determined for flake, vermicular, and spherical graphite iron. The determined value is lower than the theoretical value.

Place, publisher, year, edition, pages
2017. Vol. 53, no 4, p. 2766-2773
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-141980DOI: 10.1007/s10853-017-1657-6ISI: 000416544500040Scopus ID: 2-s2.0-85031402118OAI: oai:DiVA.org:liu-141980DiVA, id: diva2:1149548
Note

Funding agencies: Agora Materiae, graduate school, the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; Volvo Trucks; Vinnova FFI, Scania

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-12-15Bibliographically approved

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