Materials Center Leoben Forschung GmbH
Future green technologies still strongly rely on high-temperature alloys but many of these state-of-the-art alloys include critical as well as strategic raw materials posing a threat to achieving the energy transition goals. As a result, a novel ferritic alloy surpassing state-of-the-art alloys in their creep resistance while using only a small percentage of critical elements is presented. The high creep resistance is achieved by small oxide dispersions incorporated into a ferritic matrix with millimeter-sized grains. The latter property is a result of abnormal grain growth in order to overcome the pinning effect of the small nanometric oxide particles and requires precise process control. The presented results demonstrate a new alloying concept without the dispensable use of critical alloying elements and shed light on the process of obtaining oxide-dispersion-strengthened materials with abnormally large grains.
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