γ-TiAl金属间化合物铣削加工实验与有限元模拟

发布时间：2019-04-01 12:34

【摘要】：运用ABAQUS有限元软件建立了γ-TiAl金属间化合物铣削加工的细观模型,分析了不同材料模型的加工表面形貌及边缘断裂形成机理。结果表明,由于片层之间的材料特性不同,加工过程中片层与片层之间更容易出现裂纹或凹坑。同时,由于其较低的延展性,γ-TiAl金属间化合物加工出口处形成较大的负剪切平面,从而导致边缘断裂。通过与实验结果比较,发现γ-TiAl金属间化合物铣削加工表面粗糙度和边缘断口尺寸均小于由正六边形片层细观模型所得的模拟值,且略高于由矩形片层细观模型所得的模拟值。同时,加工表面粗糙度和边缘断口尺寸随切削深度的增加而逐渐增大,而切削速率的影响较小。因此,为了得到更好的加工表面质量,γ-TiAl金属间化合物加工过程中应尽可能地采用较高的切削速率,而不是切削深度。
[Abstract]:The mesoscopic model of 纬-TiAl intermetallic compound milling was established by using ABAQUS finite element software. The surface morphology and edge fracture formation mechanism of different material models were analyzed. The results show that cracks or craters are more likely to occur between lamellae and lamellar during machining because of the different material characteristics between the lamellae. At the same time, because of its low ductility, 纬-TiAl intermetallics formed a large negative shear plane at the processing outlet, which led to edge fracture. Compared with the experimental results, it is found that the surface roughness and the edge fracture size of 纬-TiAl intermetallic compound milling are smaller than the simulated values obtained from the mesoscopic model of positive hexagonal laminate. Moreover, it is slightly higher than the simulated values obtained from the rectangular lamellar mesoscopic model. At the same time, the roughness of the machined surface and the size of the edge fracture surface gradually increase with the increase of the cutting depth, but the effect of the cutting rate is small. Therefore in order to obtain better surface quality 纬-TiAl intermetallics should adopt higher cutting rate rather than cutting depth as far as possible in the process of machining.
【作者单位】：沈阳理工大学机械工程学院;中国科学院金属研究所;
【基金】：辽宁省教育厅一般项目No.LG201603~~
【分类号】：TG54

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