<i>γ</i>-TiAl金属间化合物铣削加工实验与有限元模拟

doi:10.11900/0412.1961.2016.00256

金属学报

2017, Vol. 53

Issue (4): 505-512 DOI: 10.11900/0412.1961.2016.00256

本期目录 | 过刊浏览

γ-TiAl金属间化合物铣削加工实验与有限元模拟

周丽^1,²,崔超¹,贾清²(

),马英石¹

1 沈阳理工大学机械工程学院沈阳 110159
2 中国科学院金属研究所沈阳 110016

Experimental and Finite Element Simulation of Milling Process for γ-TiAl Intermetallics

Li ZHOU^1,²,Chao CUI¹,Qing JIA²(

),Yingshi MA¹

1 School of Mechanical Engineering, Shenyang Ligong University, Shenyang 110159, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

周丽,崔超,贾清,马英石. γ-TiAl金属间化合物铣削加工实验与有限元模拟[J]. 金属学报, 2017, 53(4): 505-512.
Li ZHOU, Chao CUI, Qing JIA, Yingshi MA. Experimental and Finite Element Simulation of Milling Process for γ-TiAl Intermetallics[J]. Acta Metall Sin, 2017, 53(4): 505-512.

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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。

关键词 ： γ-TiAl 金属间化合物, 铣削加工, 细观模型, 有限元

Abstract：

γ-TiAl intermetallics are attractive candidates for applications in aircraft turbine engines due to their low density and good mechanical properties at high temperature. However, the low room temperature ductility makes the machinability of these materials poorer compared to the conventional alloys. In this work, a meso-model of γ-TiAl intermetallic was developed using ABAQUS finite element software. The surface morphology and edge fracture mechanism of different material models were analyzed, and the effects of cutting parameters on the surface roughness and size of edge fracture were investigated. The results indicate that the cracks and pits occur between the lamellar and lamellar with different material properties. At the same time, due to the low ductility of γ-TiAl intermetallic, the negative shear angle begins to form at the exit of workpiece, then the edge fracture is formed. In addition, for both surface roughness and size of edge fracture, the experimental data are slightly higher than the simulated data obtained by the hexagonal lamellar model, and smaller than those obtained by the rectangular lamellar model. With the increasing of cutting depth, the surface roughness and the size of edge fracture increase gradually, on the contrary, the cutting speed has a small effect on them. Therefore, in order to obtain a fine surface quality during machining of γ-TiAl intermetallic, the cutting speed can be adopted as higher as possible, but not the cutting depth.

Key words： γ-TiAl intermetallics milling process meso-model finite element

收稿日期: 2016-06-23

基金资助:辽宁省教育厅一般项目No.LG201603

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00256 或 https://www.ams.org.cn/CN/Y2017/V53/I4/505

图1 γ-TiAl金属间化合物微观形貌的OM像

图2 平面端铣加工示意图

图3 二维单齿铣削模型

图4 γ-TiAl金属间化合物二维有限元模型及其局部放大图

图5 六边形片层结构和矩形片层结构的0°片层取向、45°片层取向、90°片层取向和全片层组织的有限元模型

图6 正六边形片层结构和矩形片层结构细观模型获得的γ-TiAl金属间化合物的表面形貌

图7 γ-TiAl金属间化合物铣削加工断面和表面形貌的OM像

图8 表面粗糙度与铣削深度和铣削速率的关系

表1 γ-TiAl金属间化合物不同片层组织的材料常数[5~12,25]

图9 正六边形片层结构和矩形片层结构细观模型获得的γ-TiAl金属间化合物断裂前后工件出口处的边缘形貌

图10 γ-TiAl 金属间化合物断口形貌的SEM像

图11 γ-TiAl金属间化合物加工后工件边缘形貌的OM像

图12 边缘断口尺寸与切削参数的关系

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