2025年5月30日、Dr. Damien TEXIER によるご講演が第173回構材ゼミとして開催されます。
日時：2025年5月30日（金曜日）13:30-15:00
場所：NIMS千現地区 先進構造材料研究棟5階カンファレンスルーム
講演題目：Effect of strain rate and grain size on the oxidation- assisted intergranular cracking of the Alloy 718 at 650 °C
講演者：Dr. Damien TEXIER, Clement Ader Institute (ICA) - UMR CNRS, France
開催者：Thomas E. J. Edwards,（強度物性グループ）
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.