Journal Article10.1016/J.MSEA.2015.05.003
An improved X-ray diffraction analysis method to characterize dislocation density in lath martensitic structures
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TL;DR: In this paper, an improved X-ray diffraction line profile analysis method is developed to determine dislocation density of lath martensitic steels, which combines the modified Warren-Averbach (MWA) and the modified Williamson-Hall (MWH) methods.
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Abstract: An improved X-ray diffraction line profile analysis method is developed to determine dislocation density of lath martensitic steels. This method combines the modified Warren–Averbach (MWA) and the modified Williamson–Hall (MWH) methods. The developed method is robust and leads to unique values for the dislocation density, the effective outer cut-off radius of the dislocations ( R e ) and the dislocations distribution parameter ( M ). Dislocation structures of lath martensite in a steel, in the as-quenched condition as well as in tempered conditions, are characterized by using the proposed method. The calculated dislocation density is compared with the values obtained from the MWH method by considering a constant value for M . It was found that both methods provide dislocation densities in the range of the values calculated from the dislocation strengthening component of the yield strength.
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Citations
Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite
TL;DR: In this paper, the effect of PAGS refinement by thermal cycling on different microstructural features of as-quenched lath martensite in a 0.3C-1.6Si-3.5Mn (wt pct) steel was analyzed.
Thermal and mechanical stability of retained austenite surrounded by martensite with different degrees of tempering
TL;DR: In this paper, the effect of tempering in martensite is isolated from other factors influencing the stability of austenite, and the thermal stability during heating of retained Austenite was evaluated by monitoring phase fractions as a function of controlled temperature employing both dilatometry and magnetometry measurements.
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TL;DR: In this article, the effect of high current density electropulsing (103 A/mm2 for 150 μs) on the residual stress of quenched steel was investigated with the objective of determining the electroplastic effect on plastic strain and dislocation evolution.
155
Microstructure and properties of Cu-Cr-Nb alloy with high strength, high electrical conductivity and good softening resistance performance at elevated temperature
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TL;DR: In this article, the microstructures of the Cu-Cr-Nb alloy were investigated using transmission electron microscopy and three-dimensional atom probe tomography technique, and the tensile strength / elongation of the alloy approached 399 MPa / 22.9% as test at 200 ℃, 334 MPa / 14.8% for 300
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Ductile 2-GPa steels with hierarchical substructure
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115
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