The morphology and crystallography of lath martensite in Fe-C alloys |
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| Affiliation: | 1. Department of Materials Science and Engineering, Kyoto University, Yoshida-honnmachi, Sakyo-ku, Kyoto 606-8501, Japan;2. Nippon Steel Co., 1-1 Tobihatacho, Tobihata-ku, Kitakyushu, Fukuoka 804-8501, Japan;3. Graduate student, Kyoto University, Japan;1. Materials Science and Characterization (MAC), Department of Wind Energy, Technical University of Denmark, DK-4000, Roskilde, Denmark;2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China;1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;3. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114000, China;4. Laboratory for Excellence in Advanced Steel Research, Materials Science and Engineering Program, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX, 79968, USA;1. Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana 502285, India;2. Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;3. Homi Bhabha National Institute, Kalpakkam 603102, India |
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| Abstract: | The morphology and crystallography of lath martensite in Fe-C alloys containing various carbon contents from 0.0026 to 0.61% were studied by analyzing electron back scattered diffraction patterns in scanning electron microscopy and Kikuchi diffraction patterns in transmission electron microscopy. As carbon content increases, the sizes of both packet and block decrease. In low carbon steels (0.0026–0.38%C), a block which is observed as having different contrasts under optical microscopy contains two groups (sub-blocks) of laths which are of two K-S variants with a misorientation of about 10 degrees. On the other hand, in the high carbon alloy (0.61%C), a block consists of laths of a single K-S variant. |
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