Abstract
The weld solidification cracking susceptibility of several solid-solution strengthened Ni-base filler metals was evaluated using the transverse Varestraint test. The alloys tested included Inconel 617, Inconel 625, Hastelloy X, Hastelloy W, and Haynes 230W.* Susceptibility was quantified by determining the solidification cracking temperature range (SCTR) which is a direct measurement of the range over which cracking occurs. This temperature range was then compared to the equilibrium solidification temperature range derived from Calphad-based ThermoCalc™ calculations, Scheil-Gulliver solidification simulations, and in-situ measurements using the single sensor differential thermal analysis (SS-DTA) technique.
Good correlation among the simulated and measured solidification temperature ranges, and SCTR values were found for the 617 and 230W filler metals. These two filler metals exhibited the best resistance to weld solidification cracking. Correlation among measured and simulated temperature ranges, and SCTR was poor for Hastelloy alloys X and W. Alloy 625 was found to be the most susceptible to solidification cracking, but this result is in conflict with fabrication experience. This appears to be the result of the inability of the Varestraint test to account for crack “healing” during the final stages of solidification.
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References
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Lippold, J., Sowards, J., Murray, G., Alexandrov, B., Ramirez, A. (2008). Weld Solidification Cracking in Solid-Solution Strengthened Ni-Base Filler Metals. In: Böllinghaus, T., Herold, H., Cross, C.E., Lippold, J.C. (eds) Hot Cracking Phenomena in Welds II. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78628-3_9
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DOI: https://doi.org/10.1007/978-3-540-78628-3_9
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