Migration of δ/γ, Interface in Low Carbon Steels during Continuous Cooling |
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作者姓名: | Qing-chun LI Yong-feng QI Shu XU Chao WANG Guo-wei CHANG |
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作者单位: | School of Materials Science and Engineering, Liaoning University o{ Technology, Jinzhou 121000, Liaoning, China |
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基金项目: | Item Sponsored by National Natural Science Foundation of China(51204092);Open Project of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing of China(SELF-2012-02) |
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摘 要: | The δ-ferrite to γ-austenite phase transformation process of low carbon steel was observed in-situ under a confocal scanning laser microscope and the influence of manganese and chromium on the migration of δ/γ interphase boundary during theδ to γphase transformation was studied. It was found that the δ/γ interphase boundary becomes unstable with the decrease of temperature, from planar to curved morphology during theδ to γ phase transformation of Fe-0.08C steel and Fe-0.08C-0.8Mn steel. But in Fe-0.08C-0.8Cr steel, the δ/γ interphase boundaries are stable with planar morphology during the whole δ-ferrite to γ-austenite transformation. The destabilization of δ/γ inter- phase boundary in Fe-0.08C and Fe-0.08C-0.8Mn steels results from high degree of supercooling and sub-boundaries in 7, respectively. The stabilization of δ/γ interphase boundary in Fe-0.08C-0.8Cr steel results from the slow diffu- sion rate of carbon atom induced by the addition of chromium.
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关 键 词: | 中低碳钢 相界面 连续冷却 迁移 奥氏体转变 相变过程 平面形态 铁素体 |
收稿时间: | 29 May 2013 |
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