0

Variable Polarity GTAW of SMP14 Single Crystal Superalloy: Part One — Effects on Microstructure and Tensile Properties FREE

[+] Author Affiliations
Warren Miglietti, Jeff Benson, Fritz Blum, Philip Harms, Ros Pennefather

MATTEK - CSIR, Pretoria, South Africa

Paper No. 97-GT-348, pp. V004T12A007; 14 pages
doi:10.1115/97-GT-348
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

Gas tungsten arc welding (GTAW) using AC or DC current types has been utilised for the manufacture and repair of turbine engine components for many years. The weld repair of single crystal components such as turbine blade tips is also important. However, welding of a single crystal alloy has its associated problems (which will be discussed later). SMP14 is an advanced single crystal, Ni-base superalloy used for turbine blading. This alloy has enhanced mechanical properties at elevated temperatures when compared to equiaxed, directionally solidified and first generation single crystal superalloys. The objective of this task is to investigate the weldability of SMP14 using the new variable polarity GTAW process. Metallurgical investigations were undertaken to evaluate the microstructure of the welded region. Microporosity was found in the weld and there was no evidence of recrystallization, sub-grains beneath the weld or microcracking/microfissuring. Tensile test evaluations revealed that a high strength weld equivalent to equiaxed MAR-M247, Ni-based superalloy could be achieved. This appears to be the highest weld mechanical strength achieved to date when joining any Ni-base single crystal alloy together. Fractography was also utilised to analyse the fracture surfaces of the tensile test samples. Oxidation tests also revealed that the oxidation resistance of the weld was good and will be suitable for weld tip restoration where the weld needs to have good oxidation resistance.

Copyright © 1997 by ASME
This article is only available in the PDF format.

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

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 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