0
Research Papers: Gas Turbines: Manufacturing, Materials, and Metallurgy

Fast Epitaxial High Temperature Brazing of Single Crystalline Nickel Based Superalloys

[+] Author and Article Information
Britta Laux

Technische Universität Braunschweig, Institut für Werkstoffe, 38106 Braunschweig, Germanyb.laux@tu-bs.de

Sebastian Piegert, Joachim Rösler

Technische Universität Braunschweig, Institut für Werkstoffe, 38106 Braunschweig, Germany

J. Eng. Gas Turbines Power 131(3), 032102 (Feb 11, 2009) (8 pages) doi:10.1115/1.3026576 History: Received April 16, 2008; Revised April 23, 2008; Published February 11, 2009

A new high temperature brazing technology for the repair of turbine components made of single crystalline nickel based superalloys has been developed. It allows the repair of single crystalline parts by producing an epitaxially grown braze gap within very short times. In contrast to commonly used brazing technologies, the process is not diffusion based but works with consolute systems, particularly nickel-manganese alloys. Brazing experiments with 300μm wide parallel braze gaps, as well as V-shaped gaps with a maximum width of 250μm, were conducted. Furthermore, thermodynamic simulations, with the help of THERMOCALC software, Version TCR, were carried out to identify compositions with a suitable melting behavior and phase formation. With the new alloys complete, epitaxial bridging of both gap shapes has been achieved within brazing times as short as 10 min.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Binary phase diagram of the system Ni–Mn (16)

Grahic Jump Location
Figure 2

Quasibinary phase diagrams with fixed fractions of manganese and varying fractions of silicon, simulated with THERMOCALC , Version TCR. (a) 15 wt % Mn, (b) 20 wt % Mn, (c) 25 wt % Mn, and (d): 30 wt % Mn

Grahic Jump Location
Figure 3

Calculated fraction of solid versus temperature curves for the alloys listed in Table 2 with exception of the azeotropic system: complete equilibrium in comparison to Scheil calculations

Grahic Jump Location
Figure 4

Liquidus surface of the ternary system Ni–Mn–Si simulated by assuming complete equilibrium with the solidification paths of the two ternary systems, calculated by utilizing the Scheil module

Grahic Jump Location
Figure 5

Braze gap specimens: parallel gap, 300 μm (left), V-shaped gap, maximum width 250 μm (right)

Grahic Jump Location
Figure 6

DSC heating curves for the chosen braze alloys

Grahic Jump Location
Figure 7

Different brazing cycles

Grahic Jump Location
Figure 8

Light microscope images of the brazed gaps etched with V2A etchant

Grahic Jump Location
Figure 9

EBSD analysis: Ni–36.7Mn, parallel gap, TB=1433 K, TF=1273 K, tBF=300 min, ramp

Grahic Jump Location
Figure 10

EBSD analysis: Ni–20Mn–2Si, parallel gap, TB=1533 K, TF=1273 K, tBF=300 min, ramp

Grahic Jump Location
Figure 11

EBSD analysis: Ni–25Mn–2Si, parallel gap, TB=1483 K, TF=1273 K, tBF=300 min, cascaded (five hold times)

Grahic Jump Location
Figure 12

EBSD analysis: Ni–25Mn–2Si, V-shaped gap, TB=1483 K, TF=1273 K, tBF=300 min, ramp

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