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An investigation on ductility-dip cracking in the base metal heat-affected zone of wrought nickel base alloys—part I: metallurgical effects and cracking mechanism

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Abstract

Ductility-dip cracking (DDC) in the heat-affected zone (HAZ) of NiCr15Fe-type alloys was studied using the programmable-deformation-crack (PVR) and the strain-to-fracture (STF) test. This paper concentrates on the cracking morphology and the effect of metallurgical factors for DDC susceptibility. The obtained results are discussed in the context of the underlying cracking mechanism. Evidence was found that DDC in the heat-affected base metal occurs due to a relative grain boundary movement, which induces high strain buildup at grain boundary triple points, subsequent cavity formation, and intergranular crack propagation. Base metal grain size and intergranular carbide precipitation are shown to have a significant effect on DDC susceptibility and are discussed in the context of the observed grain boundary sliding mechanism.

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Acknowledgments

The author would like to acknowledge the advice and ongoing support of Dr. Manuela Zinke and Prof. Dr.-Ing. Sven Jüttner, both at the Institute of Materials and Joining Technology, Otto-von-Guericke-University Magdeburg, Germany. Further, the author would like to thank Dr. Martin Wolf and Dr. Jutta Klöwer, both with VDM Metals GmbH, for their material donations and their continuing interest in this work.

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Authors and Affiliations

  1. Institute of Materials and Joining Technology (IWF), Otto-von-Guericke-University, Magdeburg, Germany

    Carolin Fink

  2. The Ohio State University, Columbus, OH, USA

    Carolin Fink

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  1. Carolin Fink
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Correspondence to Carolin Fink.

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Fink, C. An investigation on ductility-dip cracking in the base metal heat-affected zone of wrought nickel base alloys—part I: metallurgical effects and cracking mechanism. Weld World 60, 939–950 (2016). https://doi.org/10.1007/s40194-016-0370-4

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  • DOI: https://doi.org/10.1007/s40194-016-0370-4

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