About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advances in Surface Engineering
|
Presentation Title |
Influences of Varied Electro-discharge Machining Operations on Surface Conditions of a Nickel-Base Superalloy |
Author(s) |
Tim Gabb, T. M. Smith, J. Telesman, C. A. Kantzos, R. B. Rogers, D. J. Brinkman, T. J. Ubienski |
On-Site Speaker (Planned) |
Tim Gabb |
Abstract Scope |
Nickel-base superalloys designed for use in gas turbine engines blades are difficult and expensive to properly machine without undue surface damage, due in part to their superior mechanical properties at high temperatures. Numerically controlled electro-discharge machining (EDM) has progressed to commonly be used as a machining process for initial sectioning, detailed roughing, and even finishing operations. The objective of this study was to examine the resulting surface conditions of superalloy 718 after sectioning using typical roughing, semi-finishing, and finishing conditions with a typical EDM machine. Sections were sliced with brass wire. Surface roughness, microstructure, and residual stress were compared for varied conditions. While roughness decreased when progressing from roughing to finishing EDM conditions, significant tensile residual stresses remained present. The varied EDM conditions also influenced the microstructure near the surface. |