Effect of pulling speed on the organization and performance of the directional annealing zone and the initial transition zone of Fe6.5SixB alloy
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摘要: 采用定向凝固技术制备Fe6.5SixB合金，研究了拉速和B含量对合金定向凝固定向退火区和初始过渡区组织演变以及力学性能和磁性能的影响。采用XRD测定合金组织结构，扫描电镜分析合金显微组织及相组成，高低温振动样品磁强计测定合金磁性能。结果表明，Fe6.5SixB合金定向退火区柱状枝晶平行拉速方向生长，过渡区为大块状晶粒。Fe6.5Si合金定向退火区主要由A2相和（A2+D03）层状组织组成，添加B后定向退火区由A2相和（A2+Fe2B）层片状共晶组织组成。随拉速增加Fe6.5Si合金中（B2+D03）层状组织含量增多，Fe6.5SixB合金中（A2+Fe2B）层状组织变细；合金应变值先增加后降低。随B含量增加Fe6.5SixB合金磁极化强度(Js)和矫顽力呈现降低趋势，剩磁(Jr)呈现增加趋势，合金硬度值降低。
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关键词:
- 定向凝固 /
- Fe6.5SixB合金 /
- 凝固速率 /
- 拉速
Abstract: The Fe6.5SixB alloy was prepared by a directional solidification technique. The effects of pulling rate and B content on the the microstructure evolution of the directional annealing zone and the initial transition zone of directional solidified Fe6.5SixBi alloy, as well as mechanical and magnetic properties were studied. XRD was used to determine the microstructure of the alloy, SEM was used to analyze the microstructure and phase composition of the alloy, and the magnetic properties of the alloy were determined by using vibration sample magnetometer at high and low temperature. The results show that the columnar dendrite grows in the parallel pulling rate direction at the annealing zone of Fe6.5SixB alloy, and the transition zone is large lumpy grains. The directional annealing zone of Fe6.5Si alloy is mainly composed of A2 phase and (B2+D03) layered structure, and after B addition, the directional annealing zone of the alloy consists of phase A2 and and (A2+Fe2B) lamellar eutectic structures. With the increase of pulling rate, the (B2 + D03) layered structue content increased in Fe6.5Si alloy, and (A2 + Fe2B) became finer in Fe6.5SixB alloy. The strain value of the alloy first increases and then decreases. With the increase of B content, the magnetic polarization strength (Js) and coercivity of Fe6.5SixB alloy show a decreasing trend, while the residual magnetism (Jr) shows an increasing trend; the hardness value of the alloy decreases.-
Key words:
- directional solidification /
- Fe6.5SixB alloy /
- solidification rate /
- pulling rate
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图 1 LMC定向凝固设备和样品位置及温度曲线
(a) LMC定向凝固设备; (b) 温度曲线
Figure 1. The structure sketch of LMC directional solidified equipment and sample location and temperature curve
图 2 不同拉速Fe6.5Si$x $B合金定向退火区和初始过渡区的金相显微组织
Figure 2. Microstructure of Fe6.5Si$x $B alloys with different pulling rates in directional annealing zone and the initial transition zone
Fe6.5Si: (a1) v=33 μm/s, (a2) v=83 μm/s, (a3) v=167 μm/s; Fe6.5Si0.025B: (b1) v=33 μm/s, (b2) v=83 μm/s, (b3) v=167 μm/s; Fe6.5Si0.04B: (c1) v=33 μm/s, (c2) v=83 μm/s, (c3) v=167 μm/s
图 3 不同拉速下定向凝固Fe6.5Si$x $B合金粉末X射线衍射图谱
Figure 3. X-ray diffraction pattern of Fe6.5Si$x $B alloy powder at different pulling rates
(a) v=33 μm/s; (b) v=83 μm/s; (c) v=167 μm/s
图 4 Fe6.5Si$x $B合金定向退火区和初始过渡区的扫描电镜显微组织
Figure 4. SEM images of Fe6.5Si$x $B alloy in directional annealing zone and the initial transition zone
Fe6.5Si: (a1) v=33 μm/s, (a2) v=83 μm/s, (a3) v=167 μm/s; Fe6.5Si0.025 B: (b1) v=33 μm/s, (b2) v=83 μm/s, (b3) v=167 μm/s; Fe6.5Si0.04B: (c1) v=33 μm/s, (c2) v=83 μm/s, (c3) v=167 μm/s
图 5 Fe6.5Si合金析出相顺序
(a) DSC曲线; (b) 样品底部析出相顺序; (c) 样品顶部析出相顺序
Figure 5. The sequence of phase precipitation of Fe6.5Si alloy
图 6 Fe6.5Si$x $B合金析出相顺序
(a) 样品顶部和底部的宏观形貌; (b) 样品底部析出相顺序; (c) 样品顶部析出相顺序
Figure 6. The sequence of phase precipitation of Fe6.5Si$x$B alloy
图 7 不同B含量Fe6.5Si$x $B合金的磁性能曲线
Figure 7. The magnetic property curves of Fe6.5Si$x $B alloys with different B contents
(a) 33 μm/s; (b) 83 μm/s; (c) 167 μm/s
图 8 不同拉速${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $合金的磁性能曲线
(a) 拉速-剩磁; (b) 拉速-磁极化强度; (c) 拉速-矫顽力
Figure 8. The magnetic property curves of ${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $ alloy with different pulling rates
图 9 ${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $合金的力学性能
(a) 33 μm/s 应力-应变; (b) 83 μm/s 应力-应变; (c) 167 μm/s 应力-应变; (d) 拉速-维氏硬度
Figure 9. Mechanical properties of ${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $ alloy
图 10 ${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $合金的断口形貌
Figure 10. The fracture morphology of the ${\mathrm{Fe}}6.5{\mathrm{Si}}x{\mathrm{B}} $ alloy
Fe6.5Si：(a1) v=33 mm/s; (a2) v=83 mm/s, (a3) v=167 mm/s; Fe6.5Si0.025B: (b1) v=33 mm/s, (b2) v=83 mm/s, (b3) v=167 mm/s; Fe6.5Si0.04B: (c1) v=33 mm/s, (c2) v=83 mm/s, (c3) v=167 mm/s
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