| Non-Steady Equilibrium during Pro-Eutectoid Ferrite Formation in Fe-0.2C Alloy |
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| 作者姓名： | ZHANG Hong bing WU Rui heng HSU T Y |
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| 作者单位： | ZHANG Hong bing 1，WU Rui heng 2，HSU T Y(XU Zu yao) 2，RUAN Xue yu 2 (1. Shanghai Institute of Technology，Shanghai 200233，China; 2. Shanghai Jiaotong University，Shanghai 200030，China) |
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| 基金项目： | ItemSponsoredbyNationalNaturalScienceFoundationofChina (50 0 750 53) |
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| 摘 要： | Ｔｈｅｐｒｅｃｉｐｉｔａｔｉｏｎｏｆｐｒｏ ｅｕｔｅｃｔｏｉｄｆｅｒｒｉｔｅｆｒｏｍａｕｓｔｅｎｉｔｅｉｓｃｏｎｔｒｏｌｌｅｄｂｙｄｉｆｆｕｓｉｏｎｉｎＦｅ Ｃａｌｌｏｙｓ .Ｗｉｔｈｔｈｅａｓｓｕｍｐｔｉｏｎｔｈａｔｔｈｅｍｉｇｒａｔｉｎｇｉｎｔｅｒｆａｃｅｉｓａｌｗａｙｓｉｎｌｏｃａｌｅｑｕｉｌｉｂｒｉｕｍ ,ｅａｒｌｙｉｎ 194 9,ＺｅｎｅｒＣ1] ｅｘｐｌａｉｎｅｄｔｈｅｄｉｆｆｕｓｉｏｎａｌｇｒｏｗｔｈｏｆｐｒｏ ｅｕｔｅｃ ｔｏｉｄｆｅｒｒｉｔｅｂｙｕｓｉｎｇｔｈｅＦｉｃｋ’ｓｌａｗ .Ｓｉｎｃｅ…
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| 关 键 词： | pro-eutectoid ferrite non-steady diffusion diffusion velocity Fick‘s second law |
Non-Steady Equilibrium during Pro-Eutectoid Ferrite Formation in Fe-0.2C Alloy |
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| ZHANG Hong bing ,WU Rui heng ,HSU T Y.Non-Steady Equilibrium during Pro-Eutectoid Ferrite Formation in Fe-0.2C Alloy[J].Journal of Iron and Steel Research,2002,9(2):28-32. |
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| Authors: | ZHANG Hong-bing WU Rui-heng HSU T Y RUAN Xue-yu |
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| Affiliation: | 1. Shanghai Institute of Technology, Shanghai 200233, China
2. Shanghai Jiaotong University, Shanghai 200030, China |
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| Abstract: | By using the Fick's second law, the carbon concentration of phase γ at non-equilibrium interface and its distribution in austenite during the decomposition of austenite to ferrite in Fe-C alloys were calculated. For example, it takes 160 sat 1 025 K, 210 s at 975 K, 270 s at 925 K and 580 s at 875 K for reaching the equilibrium carbon concentrations of phase γ at the α/γ interface in Fe-0.2C alloy, and the relationship between the ratio Cγ int/Cγ/α and the time meets the parabola law with parabola exponents of 0.167 39, 0.235 97, 0.319 87 and 0.389 44 at 1*!025 K, 975 K, 925 K and 875 K respectively. The decrease of the diffusion velocity of carbon in austenite with the increase of under-cooling would be counteracted by the increase of driving force for pro-eutectoid ferrite formation before soft impingement of ferrite grains with each other; but the effect of diffusion is more intensive than that of driving force at the later stage. |
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| Keywords: | pro eutectoid ferrite non steady diffusion diffusion velocity Fick's second law |
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