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Solidification Path, Microstructure, and Weldability Differences Between Fe-Based Superalloy A286 and an Experimental γ′ Strengthened TRIP Steel

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Abstract

MODTRIP-130, a recently designed steel adapted from the composition of superalloy A286, utilizes γ′ precipitation and the transformation induced plasticity effect to achieve high strength and toughness for a potential fit in defense applications. To be viable in this role, candidate alloys must also have good weldability. Varestraint testing, microstructural characterization, electron probe microanalysis, and differential scanning calorimetry were performed on MODTRIP-130 and A286 to characterize the solidification path and weldability of the alloys, and to compare variations in behavior induced by the differences in composition. While both alloys were highly susceptible to solidification cracking, MODTRIP-130 exhibited slightly increased cracking susceptibility. Characterization of solute partition coefficients and the evolving liquid composition during solidification revealed similar Ti and Si segregation, which caused TiC and Laves formation in both materials. Significant partitioning of Ni, and higher nominal concentrations of Ti and Al, caused the formation of an additional Ni-Al rich phase in MODTRIP-130. This correlated with an increased amount of residual liquid stabilized at the end of solidification and an increase in the fraction of secondary phases in MODTRIP-130 that exacerbated cracking susceptibility, despite its smaller solidification temperature range of 249 °C compared to 331 °C measured in A286.

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Acknowledgements

This research is sponsored by the DLA-Troop Support, Philadelphia, PA and the Defense Logistics Agency Information Operations, J68, Research & Development, Ft. Belvoir, VA. The authors gratefully acknowledge useful discussions on this work from David Poweleit of the Steels Founders’ Society of America, Dr. Matthew Draper of Carderock Naval Surface Warfare Center, and Prof. Greg Olson and Clay Houser of MIT. The authors also thank Goodwin Steel Castings and Scot Forge for providing material.

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  1. Lehigh University, Bethlehem, PA, 18015, USA

    C. J. Farnin & J. N. DuPont

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Manuscript submitted May 6, 2021; accepted July 12, 2021.

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Farnin, C.J., DuPont, J.N. Solidification Path, Microstructure, and Weldability Differences Between Fe-Based Superalloy A286 and an Experimental γ′ Strengthened TRIP Steel. Metall Mater Trans A 52, 4488–4499 (2021). https://doi.org/10.1007/s11661-021-06400-8

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