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TECHNICAL PAPERS

Metallurgical Assessment of the Softened HAZ Region During Multipass Welding

[+] Author and Article Information
D. Wojnowski

Engineering Systems, Aurora, IL

Y. K. Oh

KIA Motors, Seoul, Korea

J. E. Indacochea

University of Illinois at Chicago, Chicago, IL 60607

J. Manuf. Sci. Eng 122(2), 310-315 (Oct 01, 1997) (6 pages) doi:10.1115/1.538920 History: Received November 01, 1996; Revised October 01, 1997
Copyright © 2000 by ASME
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References

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Morin, M. D., Faber, G., and Kuhen, G., 1991, “Weld Build-up Repairs of Turbine Rotors,” Maintenance and Repair Welding in Power Plants, J. G. Feldstein, ed., p. 288, American Welding Society, Miami.
Myers, J., 1975 “Service Experience of Welded Creep-Resisting Steels in High Temperature Components of a Power Generating Plant,” Welding Creep-Resistance Steels, The Welding Institute, pp. 1–3. Cambridge, Abington Halle.
Miller, R. C., and Batte, A. D., 1975, “Reheat Cracking in 1/2% Cr-Mo-V/2 17 4% Cr-Mo Welded Joints,” Met. Constr., pp. 550–558, Nov.
Kim,  G. S., Indacochea,  J. L., and Spry,  T. D., 1988, “Weldability Studies in Cr-Mo-V Turbine Rotor Steel,” J. Mater. Eng., 10, pp. 117–132.
Kim,  G. S., Indacochea,  J. E., and Spry,  T. D., 1991, “Metallurgical Aspects in Welding Cr-Mo-V Turbine Rotor Steels, Part 1: Evaluation of Base Material and Heat Affected Zone,” Mater. Sci. Technol., 7, pp. 42–49.
Kim,  G. S., Indacochea,  J. E., and Spry,  T. D., 1991, “Metallurgical Aspects in Welding Cr-Mo-V Turbine Rotor Steels,” Part 2: Evaluation of Narrow Gap Submerged Arc Weldment,” Mater. Sci. Technol., 7, pp. 147–154.
Kim,  G. S., and Indacochea,  J. E., 1996, “Reheat Cracking Studies on Simulated Heat-Affected Zones of CrMoV Turbine Rotor Steels,” J. Mater. Eng. Perform., 5, pp. 353–364.
Kasapbasioglu, H., 1992 “Weld Metal Selection for a CrMoV Weldment,” M.S. Thesis, University of Illinois at Chicago.
Chen, J., 1992, “Metallurgical and Mechanical Evaluation of Rotor Steel Weldment by Gas Tungsten-Arc Welding,” M.S. Thesis, University of Illinois at Chicago.
Bowker, J. T., McGrath, J. T., Gianetto, J. A., and Letts, M. W., 1988, “Microstructure and Notch Toughness of Simulated HAZ Regions of HSLA80 Steel,” Weld Tech 88, London, Nov.
Oh, Y. K., 1994, “Heat Affected Zone Stability of 1.0 Cr-1.0 Mo-0.25 V Baintic Turbine Rotor Steel,” Ph.D. Thesis, University of Illinois at Chicago.

Figures

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Electrode wire positions during welding
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Thermal data acquisition results for the first pass near side
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Photographs depicting (a) location of TC-0 (1.5× magnification) and (b) microstructure in the vicinity of the thermocouple
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Microhardness traverse in the neighborhood of TC-0
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Photographs depicting (a) location of TC-1 (1.5× magnification) and (b) microstructure in the vicinity of the thermocouple
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Microhardness traverse in the neighborhood of TC-1
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TEM micrographs showing carbides in (a) as-retired rotor and (b) softened region of the intercritical heat-affected zone
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Temperature versus time data for programmed and actual thermal cycles during Gleeble simulation
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Microstructures of the tempered (softened) regions of (a) Gleeble simulated HAZ and (b) actual weld HAZ near TC-1
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Microstructures pertaining to (a) a simulated GRHAZ, sample 6, and (b) GRHAZ near TC-1 in actual weld
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Optical microstructures of isothermally heat treated samples, exposed to (a) 720°C (b) 770°C (c) 790°C and (d) 840°C for four hours
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Microhardness and rupture times of isothermally heat treated samples as a function of temperature

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