Abstract
In this study, resistivity measurements are made during continuous heating and cooling on four different Ni-based superalloys of different grain structures and with different phases (i.e., γ′ and carbide). The results are directly compared with differential scanning calorimetry (DSC) profiles to identify the material’s resistivity response. The resistivity measurements have been performed using an electro-thermal mechanical testing (ETMT) system having a capability of heating and cooling a sample at a rate of up to 100 K/s by Joule heating, which is not possible with standard heating methods used in previous in-situ microstructure analysis approaches. By comparing different precipitate variations and thermal histories, γ′ volume fraction and precipitate number density are found to be the most important factors determining the resistivity of the materials. In-situ resistivity measurement was applied to several case studies to show that it can provide microstructural information in complex high temperature experiments.
Original language | English |
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Pages (from-to) | 1549–1567 |
Number of pages | 19 |
Journal | Metallurgical and Materials Transactions A |
Volume | 54 |
Early online date | 28 Dec 2022 |
DOIs | |
Publication status | Published - May 2023 |
Bibliographical note
Acknowledgments:The authors acknowledge financial support from the Hitachi Metals—University of Oxford UTC (University Technology Centre). Andrew Pearce (Instron) and T. Daniel Iskandar (Department of Materials, University of Oxford) are acknowledged for technical assistance in the experiments. The authors gratefully acknowledge Prof. D. Graham McCartney (Department of Materials, University of Oxford) for technical discussions and suggestions to improve quality of this manuscript. Dr. Magnus Hasselqvist (Siemens Industrial Turbomachinery), Zhe Chen (Siemens Energy), David Gustafsson (Siemens Energy), Dr. Jonathan Cormier (Institut Pprime), and Dr. Jérôme Blaizot (Aubert & Duval) are acknowledged for helping us to acquire experimental materials.