Welding in the World

, Volume 60, Issue 5, pp 951–961 | Cite as

An investigation of ductility-dip cracking in the base metal heat-affected zone of wrought nickel base alloys—part II: correlation of PVR and STF results

Research Paper

Abstract

Ductility-dip cracking (DDC) in the base metal 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 correlation of the different cracking criteria used in both tests for DDC susceptibility assessment. Full temperature-strain curves were developed for three base metal NiCr15Fe-alloy variants using the STF test. The results were compared to a previous material ranking obtained by PVR testing. To determine a local cracking criterion for base metal DDC in the PVR test, a finite element analysis (FEM) was conducted on the thermomechanical aspects of crack initiation during PVR testing. The local temperature and strain conditions associated with DDC in the PVR base metal HAZ were observed and discussed with regard to the comparability and transferability of the cracking criteria used in the PVR and STF test.

Keywords (IIW Thesaurus)

Hot cracking Nickel alloys Finite element analysis Weldability tests 

Notes

Acknowledgments

The authors 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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Copyright information

© International Institute of Welding 2016

Authors and Affiliations

  1. 1.Institute of Materials and Joining Technology (IWF)Otto-von-Guericke-UniversityMagdeburgGermany
  2. 2.Welding Engineering ProgramThe Ohio State UniversityColumbusUSA

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