Journal
JOURNAL OF MICROSCOPY
Volume 254, Issue 3, Pages 157-165Publisher
WILEY-BLACKWELL
DOI: 10.1111/jmi.12128
Keywords
DDC; high temperature; in situ testing; Ni-base alloys; SEM
Categories
Funding
- Brazilian Center for Research on Energy and Materials (CNPEM)
- FAPESP
- CNPq
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Nowadays, the implementation of sophisticated in situ electron microscopy tests is providing new insights in several areas. In this work, an in situ high-temperature strain test into a scanning electron microscope was developed. This setup was used to study the grain boundary sliding mechanism and its effect on the ductility dip cracking. This methodology was applied to study the mechanical behaviour of Ni-base filler metal alloys ERNiCrFe-7 and ERNiCr-3, which were evaluated between 700 degrees C and 1000 degrees C. The ductility dip cracking susceptibility (threshold strain; epsilon(min)) for both alloys was quantified. The epsilon(min) of ERNiCrFe-7 and ERNiCr-3 alloys were 7.5% and 16.5%, respectively, confirming a better resistance of ERNiCr-3 to ductility dip cracking. Furthermore, two separate components of grain boundary sliding, pure sliding (S-p) and deformation sliding (S-d), were identified and quantified. A direct and quantitative link between grain boundary tortuosity, grain boundary sliding and ductility dip cracking resistance has been established for the ERNiCrFe-7 and ERNiCr-3 alloys.
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