Effect of wire diameter on surface integrity of wire electrical discharge machined Inconel 706 for gas turbine application
Effect of wire diameter on surface integrity of wire electrical discharge machined Inconel 706 for gas turbine application
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DOI：
10.1016/j.jmapro.2016.09.001
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发表时间：
2016-10-01
影响因子：
6.2
通讯作者：
Narendranath, S.
中科院分区：
文献类型：
--
作者：
Sharma, Priyaranjan;Chakradhar, D.;Narendranath, S.
Inconel 706高温合金由于其易于加工和高机械强度而在燃气涡轮机工业领域确立了自己的地位。由于其高的应力断裂强度和拉伸屈服强度，这种高温合金的常规加工表现出加工部件的差的表面和低的尺寸精度。众所周知，大多数燃气涡轮机部件包括具有高精度的复杂形状轮廓，因此，对Inconel 706进行线切割电火花加工（WEDM）以实现制造用于燃气涡轮机应用的复杂形状部件的可行性。在目前的调查中，线直径对电火花线切割加工的性能特点，如切割速度，表面粗糙度，表面形貌，重铸层的形成，显微硬度，显微组织和冶金变化的影响进行了评估。据调查，较小直径的线是优于较大直径的线，因为它提高了生产率，以及在相同的控制参数设置下的加工部件的表面质量。此外，较小直径的线材显示出相对较低的重铸层厚度、最小的硬度变化和较短的制造时间。XRD结果证实了WED加工部件内存在残余应力。(C)2016年制造工程师协会。由爱思唯尔有限公司出版。保留所有权利。
Inconel 706 superalloy has established itself in the field of gas turbine industry because of its easy fabricability combined with high mechanical strength. Due to its high stress rupture and tensile yield strength, conventional machining of this superalloy exhibits poor surface and low dimensional accuracy of the machined components. It is well known that most of the gas turbine components include complex shaped profile with high precision and hence, wire electrical discharge machining (WEDM) of Inconel 706 has been performed to achieve the feasibility in manufacturing of complex shaped components for gas turbine application. In the current investigation, the effect of wire diameter on WEDM performance characteristics such as cutting speed, surface roughness, surface topography, recast layer formation, microhardness, microstructural and metallurgical changes have been evaluated. It was investigated that smaller diameter wire is advantageous over the larger diameter wire since it improves productivity as well as surface quality of the machined components under the same settings of control parameters. In addition, smaller diameter wire has shown comparatively lower recast layer thickness, minimum hardness alteration and shorter manufacturing time. The XRD result has confirmed the presence of residual stress within WED machined component. (C) 2016 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.