Abstract
Mechanical performance of reduced activation ferritic/martensitic (RAFM) steels for fission and fusion applications
at high temperature (i.e. above the current limit of 550 .C) requires further improvement. In this
contribution, we present the work aimed to improve the high temperature strength and creep resistance of RAFM
steels. Two RAFM steel grades were developed based on thermodynamic modelling targeted to optimize the
carbonitride precipitation distribution. A high content of carbonitride formers was considered to ensure high
fraction of finely dispersed MX-type precipitates. Following the chemical tuning guided by thermodynamic
modelling, the screening of different tempering conditions was performed in a high-throughput mode to find the
optimal heat treatment for each model alloy. The model alloys were investigated in detail to assess the microstructure,
tensile and impact properties. The results are used to validate the improvement of the new grades
compared to the reference material EUROFER97. Furthermore, the results are compared with recent developments
in high temperature RAFM steels obtained by other research groups.
Original language | English |
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Article number | 101211 |
Pages (from-to) | 1-11 |
Number of pages | 11 |
Journal | Nuclear Materials and Energy |
Volume | 32 |
DOIs | |
State | Published - Sep 2022 |