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Research Papers

Fatigue Behavior of Single Crystal Superalloy Bars Joined by Capacitor Discharge Welding

[+] Author and Article Information
S. Chiozzi1

Department of “Ingegneria dell’Innovazione”, University of Salento, I-73100, Lecce, Italysamanta.chiozzi@unisalento.it

V. Dattoma, F. Panella

Department of “Ingegneria dell’Innovazione”, University of Salento, I-73100, Lecce, Italy

1

Corresponding author.

J. Eng. Mater. Technol 132(3), 031005 (Jun 16, 2010) (7 pages) doi:10.1115/1.4001301 History: Received June 02, 2009; Revised February 18, 2010; Published June 16, 2010; Online June 16, 2010

This work concerns single crystal Ni-based superalloy welded through the capacitor discharge welding (CDW) process. The static and fatigue behavior of CMSX-4 type single crystal alloy has been analyzed, performing mechanical tests on square specimens in order to establish in detail the superalloy behavior at the expected service stresses. Tests have been conducted both at room and working temperatures (800°C), comparing base material and capacitor discharge welded joints. The material microstructure has been observed with optical and scanning electron microscopy in order to characterize welding parameters effects on the weld characteristics, analyzing base material and as-welded specimens; this way, the CDW process has been studied to perform butt joint with the better characteristics ad achieving sound welds. Microstructural modifications and the heat affected zones have been observed in the welded section as well as the interaction between weld material and parent metal. The research activities have been conducted in the frame of AWFORS project, financed by the European community.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

CD Welding electrical discharge

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Figure 2

The CDW process tool

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Figure 3

Specimen regulation system

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Figure 4

The Multipoint CDW profile

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Figure 5

Not successfully welded specimen

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Figure 6

Base material tensile behavior at room temperature

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Base material tensile behavior at working temperature

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Figure 8

Comparison between base and CD welded material at room temperature

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Figure 9

Fatigue tests of CMSX-4 at room temperature

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Figure 10

CMSX-4 base material; optical microscope

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CMSX-4 base material; SEM

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Figure 12

Micrograph of the new geometrical profile

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Figure 13

The thin welded metal layer; optical microscope

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Figure 14

The thin welded metal layer; SEM

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Figure 15

Over heating spots in the border zone

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Figure 16

Equiassic and columnar grains along the welding line

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Figure 17

Drops of welded material near the specimen edge

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Figure 18

Defects in the inner specimen part

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Figure 19

Columnar grains in the middle of the welded layer

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