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  Anisotropic distribution of the micro residual stresses in lath martensite revealed by FIB ring-core milling technique

Archie, F. M. F., Mughal, M. Z., Sebastiani, M., Bemporad, E., & Zaefferer, S. (2018). Anisotropic distribution of the micro residual stresses in lath martensite revealed by FIB ring-core milling technique. Acta Materialia, 150, 327-338. doi:10.1016/j.actamat.2018.03.030.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E728-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E729-D
Genre: Journal Article

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 Creators:
Archie, Fady Mamdouh Fawzy1, Author              
Mughal, Muhammad Zeeshan2, Author              
Sebastiani, Marco2, Author              
Bemporad, Edoardo2, Author              
Zaefferer, Stefan3, Author              
Affiliations:
1Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
2Roma Tre University, Engineering Department, Via della Vasca Navale 79, Rome, Italy, persistent22              
3Microscopy and Diffraction, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863391              

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Free keywords: Anisotropy; Austenite; Deformation; Elasticity; Grain boundaries; Ion beams; Martensite; Martensitic transformations; Milling (machining); Residual stresses; Single crystals; Strain, Austenite grain boundaries; Crystallographic parameters; Damage; EBSD; Lath martensite structures; Martensitic microstructure; Prior austenite grain boundaries; Ring core, Structural design
 Abstract: Lath martensite structures in medium-carbon steels incorporate a significant amount of residual stresses that are mostly induced by the martensitic transformation process. Although former studies could identify these stresses using diffraction techniques, it was not possible to correlate the micro-scale distribution of the stress fields with respect to the morphological and the crystallographic parameters of the martensitic structure. In this study, we employ the micro-scale focused ion beam (FIB) ring-core milling technique for the measurement of local residual strain and stress distributions in fully martensitic microstructures. The aim is to study the residual stresses occurring within individual lath martensite crystals, and within areas of lath martensite which incorporate a parent austenite grain boundary. The relaxation strains obtained by the micrometer-sized ring-core milling, which correspond to the residual stresses prior to milling, are shown to exhibit an anisotropic distribution for each martensite variant. High extension relaxation strains (i.e. compressive stresses) prevail in the direction of the transformation-induced crystal shape deformation direction. Contraction strains (i.e. tensile residual stresses) are measured normal to the extension strains. In an area containing a prior austenite grain boundary, the residual stresses appeared – altogether – lower than in single crystal martensite laths. The significant residual tensile stresses identified in the martensite structures may support the formation of martensite micro-cracks, either in the as-quenched state or during deformation. © 2018 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2018-05-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.actamat.2018.03.030
BibTex Citekey: Archie2018327
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 150 Sequence Number: - Start / End Page: 327 - 338 Identifier: ISSN: 1359-6454
CoNE: /journals/resource/954928603100