Machining Characteristics of Inconel 718 by Sinking-EDM and Wire-EDM
Machining Characteristics of Inconel 718 by Sinking-EDM and Wire-EDM
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DOI：
10.1080/10426914.2014.973579
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发表时间：
2015-08-03
影响因子：
4.8
通讯作者：
Cheng, X.
中科院分区：
文献类型：
--
作者：
Li, L.;Li, Z. Y.;Cheng, X.
Inconel 718高温合金具有优异的力学性能，在许多行业中有着广泛的应用。然而，由于其在高温下的高强度，使用传统的切削和磨削加工是非常困难的。电火花加工（EDM）是电蚀加工Inconel合金的一种替代工艺。然而，电火花加工因科镍合金表面的可加工性和表面特性知之甚少。本文研究了新型Cu-SiC电极对Inconel 718的电火花线切割和电火花下沉加工特性。材料去除效率，表面粗糙度，表面形貌，表面合金化，和电极磨损的特点。结果表明，Inconel 718合金的高韧性是导致电火花加工表面无微裂纹的主要原因。新制备的Cu-SiC电火花加工电极在材料去除率（MRR）、表面粗糙度和电极磨损方面具有更好的性能。由于SiC的熔化温度高、显微组织细小，新型Cu-SiC电极的电极损耗比传统的Cu电极低。
Inconel 718 superalloy has wide applications in several industries due to its excellent mechanical properties. However, it is very difficult to machine using conventional cutting and grinding because of its high strength at elevated temperatures. Electrical discharge machining (EDM) is an alternative competitive process to machine Inconel alloys by electrical erosion. However, machinability and surface characteristics of EDMed Inconel surfaces are poorly understood. This study focuses on the machining characteristics of Inconel 718 by Wire-EDM and Sinking-EDM with a new Cu-SiC electrode, respectively. Material removal efficiency, surface roughness, surface topography, surface alloying, and electrode wear have been characterized. It is found that the high toughness of Inconel 718 would be the major contributing factor to the absence of microcracks on the EDMed surface. The new fabricated Cu-SiC electrode for Sinking-EDM has better performance in terms of material removal rate (MRR), surface roughness, and electrode wear. The higher melting temperature and fine microstructure of SiC contribute to the lower electrode wear of the new Cu-SiC electrode than the traditional Cu electrode.