ZK60镁合金高压扭转模拟及实验研究

发布时间：2019-05-09 22:44

【摘要】：为了研究高压扭转工艺对ZK60镁合金组织及性能的影响,采用有限元法对ZK60镁合金试样高压扭转成形过程进行数值模拟,分析成形过程中等效应力、应变分布及变化趋势。通过压扭设备和专用模具对镁合金试样进行高压扭转实验,采用金相显微镜观察试样的显微组织,利用维氏硬度计测量试样的显微硬度。结果表明:高压扭转能有效细化晶粒,改善材料组织结构;在一定的压力下,随着压扭圈数增加,晶粒得到细化,整体显微硬度有较大的提高;高压扭转后试样的显微硬度沿试样径向呈V型分布,与有限元模拟中试样径向的等效应变分布趋势一致。试样不同区域的等效应力、应变和显微硬度差异较大,边缘处的等效应力、应变最大,显微维氏硬度值最高。
[Abstract]:In order to study the effect of high pressure torsional process on the microstructure and properties of ZK60 magnesium alloy, the finite element method was used to simulate the high pressure torsional forming process of ZK60 magnesium alloy sample, and the equivalent stress, strain distribution and changing trend in the forming process were analyzed. The high pressure torsional experiments of magnesium alloy samples were carried out by pressure torsional equipment and special die. The microstructure of the samples was observed by metallographic microscope and the microhardness of the samples was measured by Vickers hardness tester. The results show that high pressure torsional can effectively refine the grain and improve the microstructure of the material, and under certain pressure, with the increase of the number of compression and torsional cycles, the grain is refined and the overall microhardness is greatly improved. After high pressure torsion, the microhardness of the sample shows a V-shaped distribution along the radial direction of the sample, which is consistent with the radial equivalent strain distribution trend of the pilot sample simulated by finite element method. There are great differences in equivalent stress, strain and microhardness in different regions of the specimen. The equivalent stress and strain at the edge of the specimen are the largest, and the microVickers hardness is the highest.
【作者单位】：安徽科技学院机械工程学院;合肥工业大学材料科学与工程学院;
【基金】：安徽高校自然科学研究重点项目(KJ2016A179) 安徽科技学院自然科学研究项目重点项目(ZRC2013361)
【分类号】：TG146.22

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