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The uniaxial deformation behavior of low-carbon ferritic steels with grain sizes of 0.47 μm and 1.5 μm was investigated using in situ neutron diffraction measurements under both tensile and compressive loading. The analysis focused on the evolution of lattice (elastic) strains, originating from anisotropy in elastic moduli and differences in plastic flow among grains. Such plastic strain incompatibilities produce intergranular lattice strains (or stresses). The experiments revealed substantial residual intergranular lattice strains following both tensile and compressive plastic deformation. Transmission electron microscopy confirmed the grain-size dependence of dislocation structures formed during plastic flow, suggesting that plastic relaxation near grain boundaries becomes increasingly constrained with grain refinement. Overall, the results demonstrate that the magnitude of residual intergranular lattice strains increases as grain size decreases from several tens of micrometers down to 0.5 μm.

権利情報:

• In Copyright
  

キーワード: nanoindentation

刊行年月日: 2025-09-22

出版者: Elsevier BV

掲載誌:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 946 149136

研究助成金:

• National Institute for Materials Science 2012P0102
• National Institute for Materials Science 2014P0102

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.5997

公開URL: https://doi.org/10.1016/j.msea.2025.149136

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更新時刻: 2025-12-12 08:30:20 +0900

MDRでの公開時刻: 2025-12-12 08:24:05 +0900