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首页> 外文会议>International Conference on Nanomaterials by Severe Plastic Deformation(NanoSPD3); 20050922-26; Fukuoka(JP) >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：Fe-2％Si钢的高温平面应变压缩细化晶粒

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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℃ 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℃ 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℃ to 67.8% after 75% reduction at 1.100℃. 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：设计用于电磁应用的Fe-2％Si合金经受了一系列平面应变压缩（PSC）测试，在800至1,100℃的温度和恒定的工程应变下，其压缩率分别降低了25％，35％和75％。速率对应于恒定的20 mm / s的横向速度。该材料的初始结构显示出几乎等轴的晶粒，平均尺寸为80μm。所接收到的纹理的特征在于几乎随机的立方纤维（<100> // ND），旋转的立方分量上的最大值相对较弱（{001} <110>）。变形后，将样品用水淬火，以避免后处理过程中的静态重结晶事件。通过定向成像显微镜（OIM）分析了微结构，发现PSC区域仅限于样品的中心层，但最少覆盖了样品厚度的50％。在800℃下变形后，在垂直于PSC横向的截面上观察到了常规的层状变形结构。在较高的变形温度下，该结构具有双峰性质，包括层状形变带和等轴小晶粒。这些小等轴晶粒的体积分数从800℃降低75％后的19.9％增至1.100℃降低75％后的67.8％。等轴晶粒减少75％后，平均尺寸为10μm，相对于PSC之前的80μm初始尺寸而言，晶粒具有很强的细化性。铁素体硅钢在热加工过程中会经历广泛的动态恢复。尽管目前的数据表明，在高温下施加相对少量的应变后，DRX机理可能会导致晶粒细化，但是动态重结晶（DRX）尚未见报道。

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