Abstract
In part II of this work is evaluated the as-welded microstructure of Ni-Cr-Fe alloys, which were selected and modeled in part I. Detailed characterization of primary and secondary precipitates, subgrain and grain structures, partitioning, and grain boundary morphology were developed. Microstructural characterization was carried out using optical microscopy, SEM, TEM, EBSD, and XEDS techniques. These results were analyzed and compared to modeling results displaying a good agreement. The Hf additions produced the highest waviness of grain boundaries, which were related to distribution of Hf-rich carbonitrides. Experimental evidences about Mo distribution into crystal lattice have provided information about its possible role in ductility-dip cracking (DDC). Characterization results of studied alloys were analyzed and linked to their DDC resistance data aiming to establish relationships between as-welded microstructure and hot deformation performance. Wavy grain boundaries, primary carbides distribution, and strengthened crystal lattice are metallurgical characteristics related to high DDC resistance.
Similar content being viewed by others
References
J. Unfried S. and A. J. Ramirez, Mater. Sci. Forum 706–709, 945 (2012).
J. Unfried S., E. A. Torres, and A. J. Ramirez, Hot Cracking Phenomena in Welds III, 1st ed., p.295, Springer-Verlag, Berlin (2011).
A. J. Ramirez and C. M. Garzón, Hot Cracking Phenomena in Welds II, p.427, Springer-Verlag, Berlin (2008).
A. J. Ramirez, J. W. Sowards, and J. C. Lippold, J. Mater. Process. Technol. 179, 20, 212 (2006).
N. E. Nissley and J. C. Lippold, Weld. J. 87, 257s (2008).
S. D. Kiser, R. Zhang, and B. A. Baker, Proc. 8th Int. Conf. of Trends in Welding Research, p.639, Pine-Mountain, GA, USA (2009).
Q. Y. Hou, Y. Z. He, Q. A. Zhang, and J. S. Gao, Mater. Des. 28, 1982 (2007).
B. Hemsworth, T. Boniszewski, and N. F. Eaton, Met. Constr. Br. Weld. J. 1, 5 (1969).
F. N. Rhines and P. J. Wray, Trans. ASM 54, 117 (1961).
M. A. Abralov and R. U. Abdurakhmanov, Automation Welding 27, 7 (1974).
D. M. Haddrill and R. G. Baker, Br. Weld J. 12, 411 (1965).
A. J. Ramirez and J. C. Lippold, Mater. Sci. Eng. A 380, 259 (2004).
F. F. Noecker II and J. N. DuPont, Weld. J. 88, 62s (2009).
E. A. Torres, R. Caram, and A. J. Ramirez, Mater. Sci. Forum 638–642, 2858 (2010).
L. N. Zimina, N. N. Burova, and O. V. Makushok, Met. Sci. Heat Treat. 28, 130 (1986).
P. S. Kotval, J. D. Venables, and R. W. Calder, Metall. Trans. 3, 453 (1972).
J. M. Dahl, W. F. Danesi, and R. G. Dunn, Metall. Trans. 4, 1087 (1973).
J. M. Duhl and C. P. Sullivan, J. Met. 23, 38 (1971).
A. K. Jena and M. C. Chatuverdi, J. Mat. Sci. 19, 3121 (1984).
R. A. Mulford and U. F. Kocks, Scr. Metall. 13, 729 (1979).
A. Chabenat, D. Pierron, A. Thomas, F. Faure, and C. Guyon, Appl. No. 10/639,680. United States patent Pub. No. US 2004/0115086 A1 (2004).
N. E. Nissley and J. C. Lippold, Weld. J. 88, 131s (2009).
M. J. Perricone and J. N. DuPont, Metall. Trans. A 37, 1267 (2006).
T. Kraft and H. E. Exner, Mater. Sci. Technol. 14, 377 (1998).
S. Kou, Welding Metallurgy, 2nd ed., Ch. 6, p.145, John Wiley & Sons, NY (2003).
R. Mehrabian and M. C. Flemings, Metall. Trans. 1, 455 (1970).
V. H. De Alburquerque, C. C. Silva, T. I. Menezes, J. P. Farias, and J. M. Tavares, Microsc. Res. Tech. 74, 36 (2011).
M. J. Donachie and S. J. Donachie, Superalloys: A Technical Guide, 2nd ed., Ch. 3, p.37, ASM International, USA (2002).
K. Stiller, Surf. Sci. 266, 402 (1992).
Y. S. Lim, J. S. Kim, H. P. Kim, and H. D. Cho, J. Nucl. Mater. 335, 108 (2004).
C. Radrakrisnha and K. Prasad-Rao, J. Mater. Sci. 32, 1977 (1997).
K. Song and M. Aindow, Mater. Sci. Eng. A 479, 365 (2008).
P. R. Rios, Acta Metall. 35, 2805 (1987).
K. Song and M. Aindow, Metall. Mater. Trans. A 38, 1 (2007).
K. N. Ramakrishnan, S. Venkadesan, and K. P. N. Murthy, Scr. Metall. Mater. 32, 685 (1995).
J. Unfried S., C. M. R. Afonso, and A. J. Ramirez, Acta Microsc. 18C, 191 (2009).
G. A. Young, T. E. Capobianco, M. A. Penik, B. W. Morris, and J. J. McGee, Weld. J. 87, 31s (2008).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Unfried-Silgado, J., Ramirez, A.J. Modeling and characterization of as-welded microstructure of solid solution strengthened Ni-Cr-Fe alloys resistant to ductility-dip cracking Part II: Microstructure characterization. Met. Mater. Int. 20, 307–315 (2014). https://doi.org/10.1007/s12540-014-1022-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12540-014-1022-0