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Crystals 2018, 8(12), 468; https://doi.org/10.3390/cryst8120468

Morphological and Crystallographic Characteristics of α Structure in a Low-Carbon Iron–Nickel Alloy

1
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2
Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
3
Laboratory of Thermo Mechanical Metallurgy (LMTM), PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de la Maladière 71b, 2000 Neuchâtel, Switzerland
4
Institute of Water Resources and Hydropower Research, Northwest A\&F University, Yangling 712100, China
*
Authors to whom correspondence should be addressed.
Received: 29 November 2018 / Revised: 11 December 2018 / Accepted: 12 December 2018 / Published: 14 December 2018
(This article belongs to the Special Issue Microstructures and Properties of Martensitic Materials)
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Abstract

The features of α (body-centered cubic) structures were investigated in a low-carbon multicomponent alloy from morphological and crystallographic perspectives. In addition to apparent features of granular bainite and lamellar martensite, a morphological similarity can be found between lath martensite and lath bainite. Therefore, it is of interest to explore possible discrepancies between lath martensite and lath bainite from a crystallographic perspective. These microstructures were obtained by various cooling rates (i.e., water quenching, 5 °C/s, and 0.05 °C/s) and then were characterized by a combination of scanning electron microscopy and electron backscattered diffraction techniques. It is shown that: (1) Lath martensite (LM) formed in the samples that were water-quenched, and a mixture of LM and lath bainite (LB) and granular bainite (GB) formed in the samples cooled at rates of 5 °C/s and 0.05 °C/s, respectively; (2) A Kurdjumov-Sachs relationship was mostly found in as-quenched martensite, while a Greninger-Troiano relationship represented the orientation relationship of LB and GB; (3) As the cooling rate decreased, the dislocation densities in corresponding microstructures were reduced, while the tendency of variant grouping was enhanced. View Full-Text
Keywords: morphology; crystallography; martensite; granular bainite; lath bainite morphology; crystallography; martensite; granular bainite; lath bainite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mao, G.; Cayron, C.; Mao, X.; Cao, R.; Logé, R.; Chen, J. Morphological and Crystallographic Characteristics of α Structure in a Low-Carbon Iron–Nickel Alloy. Crystals 2018, 8, 468.

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