| 定向凝固Fe-6.5wt%Si合金热压缩变形行为研究 |
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| 引用本文： | 房现石,梁永锋,任松波,林均品,叶丰.定向凝固Fe-6.5wt%Si合金热压缩变形行为研究[J].功能材料,2012,43(11):1450-1454. |
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| 作者姓名： | 房现石 梁永锋 任松波 林均品 叶丰 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目，新世纪优秀人才资助项目，博士后科学基金面上资助项目 |
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| 摘 要： | 采用Gleeble 1500热模拟机对定向凝固Fe-6.5%(质量分数)Si合金进行热压缩变形研究。结果表明,Fe-6.5%(质量分数)Si合金柱状晶组织热形变过程中很难发生动态再结晶,以动态回复为主,易产生严重的变形带;在无序相区间,在柱状晶晶界处发生动态再结晶形核,但长大受到限制,仅局限于晶界附近。与锻态等轴晶组织相比,有序相区间,两种组织形变行为基本一致,受温度影响剧烈,在无序相区间,随温度升高,等轴晶组织的形变激活能略有升高,平均值约为294kJ/mol,而柱状晶组织的形变激活能逐渐降低,平均值约为260kJ/mol。
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| 关 键 词： | Fe-6.5%(质量分数)Si合金 热模拟 定向凝固 有序-无序结构 |
Study on hot-deformation behavior of directionally solidified Fe-6.5wt%Si alloy |
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| FANG Xian-shi,LIANG Yong-feng,REN Song-bo,LIN Jun-pin,YE Feng.Study on hot-deformation behavior of directionally solidified Fe-6.5wt%Si alloy[J].Journal of Functional Materials,2012,43(11):1450-1454. |
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| Authors: | FANG Xian-shi LIANG Yong-feng REN Song-bo LIN Jun-pin YE Feng |
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| Affiliation: | (State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China) |
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| Abstract: | The hot-deformation behaviours of directionally solidified Fe-6.5wt%Si alloy were invested by Gleeble 1500 thermal simulation.During hot deformation the dynamic recrystallization was very hard to take place,so the soft mechanism of the DS Fe-6.5wt%Si alloy was mainly dynamic recovery and many deformation bands formed in the columnar grains.The nucleation of dynamic recrystallization was observed at the columnar grain boundaries.The deformation behavior of columnar-grained specimens was almost the same with equiaxed-grained specimens in ordered phase zone.In the disordered phase zone,deformation activation energy for the columnar structure of DS Fe-6.5wt% alloy reduced from 294 to 260kJ/mol. |
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| Keywords: | Fe-6 5％Si alloy thermal simulation directional solidification ordered/disordered structure |
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