Dr. Damien TEXIER will give a lecture at NIMS on May 30, 2025 as the 173rd Structural Materials Seminar.
Date: May 30, Fri, 2025. 13:30-15:00
Place : Conference room, 5th floor of advanced structural materials research building, NIMS Sengen site
Title #1: Effect of strain rate and grain size on the oxidation- assisted intergranular cracking of the Alloy 718 at 650 °C
Speaker: Dr. Damien TEXIER, Clement Ader Institute (ICA) - UMR CNRS, France
Chair: Thomas E. J. Edwards, Mechanical Properties Group
Effect of strain rate and grain size on the oxidation- assisted intergranular cracking of the Alloy 718 at 650 °C
Dr. Damien TEXIER, Clement Ader Institute (ICA) - UMR CNRS, France
The Ni-based superalloy Alloy 718 (Inconel 718) is an excellent alloy candidate for structural components operating at intermediate temperatures. In the past decades, its mechanical behavior and damage behavior has been intensively investigated at high temperature to establish a relationship between its strain-rate sensitivity and its oxidation-assisted intergranular cracking (OAIC). The present study focuses on the effect of both the strain rate and the grain size effects on strain localization partitioning at GBs, TBs and intergranular at 650 °C, in the Portevin-Le-Chatelier (PLC) and non-PLC domains. HR-DIC analysis and out-of-plane measurements were performed to quantify plasticity distribution and preferential cracking site at the microstructure scale depending on the strain rate. Changes in strain localization with the grain size and strain rate demonstrated the concomitant action of strain localization and environmental degradation on the OAIC. The effect of the temperature on the intergranular versus intragranular strain partitioning is also presented.