Analysis of variant-pairing tendencies in lenticular martensite microstructures based on rank-1 connection
説明
<jats:title>Abstract</jats:title><jats:p>Herein, variant-pairing tendencies of lenticular martensite in an Fe–30Ni–0.3C (wt%) alloy are analyzed based on rank-1 connection at martensite/martensite junction planes (JPs) to facilitate the understanding of martensite microstructure. The degree of incompatibility (<jats:italic>θ</jats:italic>) at the JPs successfully explained their observed frequency; in the actual microstructure, variant pairs with a small<jats:italic>θ</jats:italic>form preferentially. The experimentally obtained JPs were consistent with theoretical ones. To the best of our knowledge, this is the first study to confirm the validity of variant-pair crystallography in steel based on rank-1 connection, both theoretically and experimentally. Diamond, composite-spear, and composite-kink clusters are considered. The cumulative<jats:italic>θ</jats:italic>at the JPs can suppress diamond cluster formation because it exceeds the<jats:italic>θ</jats:italic>of a single variant pair, and the diamond cluster is not observed experimentally. However,<jats:italic>θ</jats:italic>at the JPs cancel out in composite-spear (CS) and composite-kink (CK) clusters, but CK clusters are rarely observed experimentally, while a few CS clusters are observed. This demonstrates the analytical limitations of 2D approaches used to evaluate the frequency of variant pairs and clusters. These two variant clusters have a narrow window of 2D observation because the orientation relationships between JPs and intersection lines between two habit planes affect the areas of JPs.</jats:p>
収録刊行物
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- Scientific Reports
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Scientific Reports 11 (1), 14957-, 2021-07-22
Springer Science and Business Media LLC
