Effects of deformation temperature on the microstructure, ordering and mechanical properties of Fe-6.5 wt% Si alloy with columnar grains

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• 作者：Yuanke Mo ; Zhihao Zhang ; Huadong Fu ; Hongjiang Pan ; Jianxin Xie
• 关键词：Fe&ndash ; 6.5  ; wt%Si alloy ; Compression ; Microstructure ; Order ; Deformation resistance
• 刊名：Materials Science and Engineering: A
• 出版年：31 January, 2014
• 年：2014
• 卷：594
• 期：Complete
• 页码：111-117
• 全文大小：2708 K

文摘

The effects of deformation temperature on the microstructure, ordering and mechanical properties of Fe鈭?.5 wt%Si alloy with columnar grains compressed at 300-900 掳C were studied. The results show that under the conditions of temperature 鈮?00 掳C and compression reduction of 50%, the columnar grains remain intact without occurrence of recrystallization in the samples. After deformation at 800 掳C, the columnar grain boundaries become serrated and subgrains form in the sample during dynamic recovery. With further increasing the temperature to 900 掳C, dynamic recrystallization takes place obviously. High-density of deformation twins form in the samples deformed at 500 掳C or below, while deformation twins are not observed in the samples deformed at 550 掳C or above. The Fe鈭?.5 wt%Si alloy has the characteristic of deformation disordering and reordering at intermediate temperatures. The degree of deformation disordering is larger than that of reordering at the deformation temperature of 400-600 掳C, while this relationship is opposite at 700-800 掳C. At the deformation temperature lower than 700 掳C, deformation resistance of the Fe鈭?.5 wt%Si alloy decreases drastically with the increase of the temperature, while it decreases slowly as the temperature increased to 800-900 掳C. The appropriate deformation temperature of the Fe鈭?.5 wt%Si alloy with columnar grains is suggested at 400-700 掳C.