Uniform elongation measurements on creep specimens by a novel 3D-scanning system

ABSTRACT

The ductility of a material represents a very important value for both the classification and application of high-temperature alloys in real components. Commonly, different values have been defined and can be used to characterise the ductility of the material. Within this work, a 3D-scanning system has been developed which allow a highly precise digital reconstruction of fractured creep specimens. The digital reconstruction is used to compare and refine conventions for determining one of the ductility candidate values, the uniform elongation, in a consistent, robust and objective way. By utilizing this system, a large amount of long-term creep specimens were re-evaluated including P92 samples with challenging, since macroscopically low ductility values. The results will be discussed in by providing uniform elongation trends and by the use of the Ductility Evaluation of Creep Specimens (DECS) diagram.

KEYWORDS:

• Uniform elongation
• 3D-Scanner
• creep ductility

Acknowledgments

The underlying research project (FVV project no. 1371) was performed by the Institute of Materials Technology of the Technical University Darmstadt, by the Interactive Graphics Systems Group and by the Materials Testing Institute at the University of Stuttgart. The research project was funded by the AVIF (Research Association for the Iron and Metal Processing Industry eV, AVIF No. A314). The authors gratefully acknowledge the support received from the funding organisation, from the FVV eV and from all scientific and industry experts involved in this project.

Disclosure statement

No potential conflict of interest was reported by the author(s).