https://scholars.lib.ntu.edu.tw/handle/123456789/631339
標題: | Strategy of complex carbides in microalloyed 4Mn steels processed by quenching and austenite reversion | 作者: | SHAO-LUN LU Yang, Shan Chun Zhu, Kangying Chen, Yi Sheng Cairney, Julie M. Lin, Chun Ming HUNG-WEI YEN |
關鍵字: | Austenite reversion | Complex carbide | Mechanical property | Medium-Mn steel | Microalloying elements | 公開日期: | 1-六月-2023 | 卷: | 230 | 來源出版物: | Materials and Design | 摘要: | This work describes a strategy to employ complex carbides for high-yield microalloyed 4Mn steels processed by quenching and reversion (Q&R). The nano/microstructural details are investigated by using electron microscopy and atom probe. It is found that complex carbides are classified into two types and contribute to yield strength in different ways. First, coarse carbides (MC1), which are retained after austenization and quenching, provide the Zener pinning effect and contribute to strengthening by microstructure refinement and precipitation hardening. Second, nanoscale carbides (MC2), which precipitate in martensite during austenite reversion, provide precipitation hardening. Furthermore, the precipitation of MC1 accelerates austenite reversion due to the finer martensite microstructure. Hence, the strengthening effects and TRIP effect can be tuned by controlling the proportion of the two types of carbide. This concept is validated in Ti-Mo 4Mn steel, which exhibits a high yield strength of about 850 MPa, a high ultimate tensile strength of about 950 MPa, and excellent elongation of over 20%. The complex carbide strategy is able to increase yield strength without sacrificing much ductility for Q&R medium-Mn steels. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631339 | ISSN: | 02641275 | DOI: | 10.1016/j.matdes.2023.111951 |
顯示於: | 材料科學與工程學系 |
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