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首页> 外文会议>International Conference on Nanomaterials by Severe Plastic Deformation(NanoSPD3) >Grain Refinement by High Temperature Plane-Strain Compression of Fe-2Si Steel
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Grain Refinement by High Temperature Plane-Strain Compression of Fe-2Si Steel

机译：用Fe-2％Si钢的高温平面压缩晶粒细化

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An Fe-2%Si alloy, which was designed for electromagnetic applications was submitted to a series of plane strain compression (PSC) tests with reductions of 25, 35 and 75% at temperatures varying from 800 to 1,100°C and at a constant engineering strain rate corresponding to a constant cross velocity of 20 mm/s. The initial structure of the material displayed nearly equi-axed grains with an average size of 80 μm. The as-received texture was characterised by a nearly random cube fibre ( < 100 > //ND) with a relatively weak maximum on the rotated cube component ({001} < 110 > ). After deformation the samples were water quenched in order to avoid post-process static recrystallization events. The microstructures were analysed by orientation imaging microscopy (OIM) revealing that the zone of PSC was restricted to the central layers of the sample but minimally covering 50% of the sample thickness. After deformation at 800°C the conventional lamellar deformation structures were observed on the sections perpendicular to the transverse direction of PSC. At higher deformation temperatures the structure was of a bimodal nature consisting of lamellar deformation bands and equi-axed small grains. The volume fraction of these small equi-axed grains increased from 19.9% after 75%reduction at 800°C to 67.8% after 75% reduction at 1.100°C. After 75% reduction the equi-axed grains exhibited an average size of 10 μm which represents a strong grain refinement with respect to the initial size of 80 μm prior to PSC. Ferrite Silicon steels undergo extensive dynamic recovery during hot working. Dynamic recrystallization (DRX), though, has not yet been reported for these alloys although the present data suggest that a DRX mechanism might be responsible for the remarkable grain refinement after relatively low amounts of strain applied at high temperatures.
机译：用于电磁应用的Fe-2％Si合金被提交至一系列平面应变压缩（PSC）试验，其温度在800至1,100°C和恒定工程处的温度下减少25,35和75％应变速率对应于20mm / s的恒定交叉速度。材料的初始结构与平均尺寸为80μm的近极轴晶粒。由旋转立方体组分（{001} <110>）上具有相对较弱的最大值的几乎随机立方体光纤（<100 // nd）的特征在于接收的纹理。在变形后，样品淬火以避免后处理后静态再结晶事件。通过取向成像显微镜（OIM）分析微结构，显示PSC区域限于样品的中心层，但最小地覆盖样品厚度的50％。在800℃变形后，在垂直于PSC的横向方向的部分上观察到常规的层状变形结构。在更高的变形温度下，该结构具有由层状变形带和等轴的小晶粒组成的双峰性质。在1.100℃降低75％后，在800℃下减少75％至67.8％后，这些小型等轴晶粒的体积分数从19.9％增加到67.8％。在减少75％之后，平均轴晶粒表现出10μm的平均尺寸，其表示相对于PSC之前80μm的初始粒度的强晶粒细化。铁氧体硅钢在热工作期间经历了广泛的动态恢复。然而，尚未向这些合金报告动态重结晶（DRX），尽管本数据表明DRX机制可能对在高温下施加相对较低的菌株后的显着晶粒细化。

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