  Reduced activation ferritic/martensitic (RAFM) steels are the leading
candidate structural materials for first-wall and blanket components in fusion
reactors. This work is the first in a series to provide a systematic roadmap of
MX precipitate stability in RAFM steels under various ion irradiation
conditions. Here, the MX-TiC precipitate behavior in an advanced Fe-9Cr RAFM
steel is assessed under self-ion irradiation to damage levels ranging from 1 to
100 displacements per atom (dpa) at temperatures ranging from 300-600{\deg}C to
isolate the effects of temperature and damage level on precipitate stability.
The pre-existing MX-TiC precipitates are shown to exhibit temperature-dominated
responses, including coarsening above 400{\deg}C at damage levels of 15 dpa,
while damage levels studied at 50 dpa and higher showed dissolution across all
temperature ranges studied. The effects of ballistic dissolution and diffusion
on precipitate behavior are outlined as a function of precipitate
characteristics (number density, size, and 25 volume fraction) and irradiation
parameters with the use of the recoil resolution model of precipitate
stability. This work provides critical insights into MX-TiC stability to high
dose in-order to further optimize advanced steels with improved radiation
resistance.
