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.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

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

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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

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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

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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

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Figure 5

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

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Figure 6

DSC heating curves for the chosen braze alloys

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Figure 7

Different brazing cycles

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Figure 8

Light microscope images of the brazed gaps etched with V2A etchant

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Figure 9

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

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Figure 10

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

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Figure 11

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

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Figure 12

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




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