0
research-article

Characterization of LAM-Fabricated Porous Superalloys for Turbine Components

[+] Author and Article Information
Brandon Ealy

Center for Advanced Turbomachinery and Energy Research, University of Central Florida
brandonealy@knights.ucf.edu

Luisana Calderon

Center for Advanced Turbomachinery and Energy Research, University of Central Florida
luisana@knights.ucf.edu

Wenping Wang

Post-Doc, Center for Advanced Turbomachinery and Energy Research, University of Central Florida
wenping.wang@ucf.edu

Ranier Valentin

CDI Corporation
ranier_v@yahoo.com

Ilya Mingareev

Townes Laser Institute, CREOL, University of Central Florida
ilya.mingareev@ucf.edu

Martin Richardson

Townes Laser Institute, CREOL, University of Central Florida
mcr@creol.ucf.edu

Jay Kapat

Director of Center for Advanced Turbomachinery and Energy Research, University of Central Florida
Jayanta.Kapat@ucf.edu

1Corresponding author.

ASME doi:10.1115/1.4035560 History: Received July 21, 2016; Revised November 26, 2016

Abstract

The limits of gas turbine technology are heavily influenced by materials and manufacturing capabilities. Lately, incremental performance gains responsible for increasing the allowable TIT have been made mainly through innovations in cooling technology, specifically convective cooling schemes. Laser Additive Manufacturing (LAM) is a promising manufacturing technology that uses lasers to selectively melt powders of metal in a layer-by-layer process to directly manufacture components, paving the way to manufacture designs that are not possible with conventional casting methods. This study investigates manufacturing qualities seen in LAM methods and its ability to successfully produce complex features found in turbine blades. A leading edge segment of a turbine blade, containing both internal and external cooling features, along with an engineered-porous structure is fabricated by laser additive manufacturing of superalloy powders. Through a non-destructive approach, the presented geometry is analyzed against the departure of the design by utilizing x-ray computed tomography (CT). Variance distribution between the design and manufactured leading edge segment are carried out for both internal impingement and external transpiration hole diameters. Flow testing is performed in order to characterize the uniformity of porous regions and flow characteristics across the entire article for various pressure ratios (PR). Discharge coefficients of internal impingement arrays and engineered-porous structures are quantified. The analysis yields quantitative data on the build quality of the LAM process, providing insight as to whether or not it is a viable option for direct manufacture of micro-features in current turbine blade production.

Copyright (c) 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In