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Open AccessArticle

The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds

1
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Division of Nuclear Fuels and Materials, Institute of Nuclear Energy Research, Taoyuan 32546, Taiwan
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 651; https://doi.org/10.3390/met9060651
Received: 14 May 2019 / Revised: 30 May 2019 / Accepted: 1 June 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Welding Metallurgy and Weldability of Superalloys)
Overlay-welding of IN52M and IN52MSS onto CF8A stainless steel (SS) was conducted by a gas tungsten arc welding process in multiple passes. An electron probe micro-analyzer (EPMA) was applied to determine the distributions and chemical compositions of the grain boundary microconstituents, and the structures were identified by electron backscatter diffraction (EBSD). The hot cracking of the overlay welds was related to the microconstituents at the interdendritic boundaries. The formation of γ-intermetallic (Ni3(Nb,Mo)) eutectics was responsible predominantly for the hot cracking of the 52M and 52MSS overlays. The greater Nb and Mo contents in the 52MSS overlay enhanced the formation of coarser microconstituents in greater amounts at the interdendritic boundaries. Thus, the hot cracking sensitivity of the 52MSS overlay was higher than that of the 52M overlay. Moreover, migrated grain boundaries were observed in the 52M and 52MSS overlays but did not induce ductility dip cracking (DDC) in this study. View Full-Text
Keywords: IN52M; IN52MSS; weld overlay; hot cracking; ductility dip cracking; CF8A stainless steel IN52M; IN52MSS; weld overlay; hot cracking; ductility dip cracking; CF8A stainless steel
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MDPI and ACS Style

Chen, M.-Y.; Wu, T.-J.; Chen, T.-C.; Jeng, S.-L.; Tsay, L.-W. The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds. Metals 2019, 9, 651.

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