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
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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
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.
- 1.Fink C (2016) An investigation of ductility-dip cracking in the base metal heat-affected zone of wrought nickel base alloys—part I: metallurgical effects and cracking mechanism, welding in the world (in review)Google Scholar
- 4.Prokhorov NN (1965) The technological strength of metals while crystallizing during welding, IIW-Doc. IX-479-65Google Scholar
- 5.Herold H, Streitenberger M, Pchennikov A (2000) Modelling of the PVR-test to examine the origin of different hot cracking types, IIW-Doc. IX-H-474-00Google Scholar
- 6.ISO/TR 17641–3:2005 (2005) Destructive tests on welds in metallic materials—hot cracking tests for weldments—arc welding processes—part 3: externally loaded testsGoogle Scholar
- 8.Zhang Y-C, Nakagawa H, Matsuda F (1985) Weldability of Fe-36%Ni alloy (report III): dynamic observation of reheat hot crack and evaluation of hot ductility of reheated weld metal. Trans JWRI 14(1):107–114Google Scholar
- 9.Nissley NE, Lippold JC (2003) Development of the strain-to-fracture test. Welding J 82(12):355s–364sGoogle Scholar