摘要
含Si约6.5%(质量分数)的Fe Si合金具有优异的软磁性能,但由于其室温脆性差而难以通过常规的冷轧工艺加工成薄板。本文研究了微合金化元素-硼对铸态Fe 6.5%(质量分数)Si合金组织和性能的影响,以及该合金薄板在不同温度下拉伸的力学性能,并观察了拉伸断口形貌。结果表明,硼元素的添加使得该铸态合金晶粒细化,从而提高了该合金的塑性。Fe 6.5%(质量分数)Si合金薄板在不同温度下的拉伸结果表明,室温延伸率达到6.4%,500℃延伸率达最大值(32.96%),明显高于600℃时的延伸率,原因是600℃处于B2和DO3两相区,在温度600℃下发生了DO3相到B2相的转变,使得B2相有所增加。B2相的增加降低了Fe 6.5%(质量分数)Si合金的塑性。
Excellent soft magnetic properties are obtained in alloys with a Si-content of 6.5wt%, but their room temperature embrittlement is severe and their cold-rolling procedure is very difficult. The influence of boron on microstructure and properties of the as-cast Fe-6.5%Si alloys was analyzed in this paper, and the tensile property of the thin sheets of the studied alloys had been investigated at different temperatures. Fracture surfaces of the deformed specimens were examined by SEM. It was found that boron has great effect on the grain size and grain boundary cohesion, improving ductility for studied alloys. The elongation of the specimen deformed at room temperature was 6.4%. The elongation of the specimen deformed at the temperature of 500°C was the highest, and it was higher than that at 600°C. The reason was that at 600°C a part of DO3 phase transforms to B2 phase, so the B2 phase increases. The increase of B2 phase reduces the ductility for the Fe-6.5wt%Si alloys, however, at 500°C the Fe-6.5wt%Si alloys almost have DO3 phase, so they have good workability.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2004年第6期683-685,共3页
Journal of Functional Materials
基金
973国家自然科学基金资助项目(G200061206 2)
关键词
Fe-6.5%(质量分数)Si合金
延伸率
解理断口
硼
Boron
Cold rolling
Embrittlement
Grain size and shape
Mechanical properties
Metallographic microstructure
Phase transitions
Scanning electron microscopy
Silicon alloys
Soft magnetic materials
Tensile properties
