Oxide dispersion-strengthened iron-based alloy powder and characterization method thereof

A characterization method of an oxide dispersion-strengthened (ODS) iron-based alloy powder, comprising the following steps:

• Step A:
• putting the ODS iron-based alloy powder and foam nickel into a beaker filled with absolute ethanol together, and then dispersing by ultrasonic to obtain foam nickel filled with the ODS iron-based alloy powder;
• Step B:
• putting the foam nickel filled with the ODS iron-based alloy powder into an electrolyte, electrolyzing, to separate strengthening phases from iron-based alloy matrix, and then conducting magnetic separation to obtain an electrolyte containing strengthening phase particles;
• Step C:
• extracting the electrolyte containing the strengthening phase particles prepared by electrolyzing, and diluting with absolute ethanol to obtain a diluted suspension;
• Step D:
• dispersing the diluted suspension by ultrasonic to obtain a solution containing nano-scaled to submicron-scaled strengthening phase particles for use;
• Step E:
• dripping the solution containing the nano-scaled to submicron-scaled strengthening phase particles for use onto an ultrathin carbon support film for 3 times, and then drying to obtain a transmission electron microscope (TEM) test sample;
• and
• Step F:
• characterizing the nano-scaled to submicron-scaled strengthening phase particles of the TEM test sample via an electron microscope,
• wherein the ODS iron-based alloy powder comprises the iron-based alloy matrix and the strengthening phases;
• the strengthening phases comprise at least two types of strengthening phase particles with different sizes;
• the two types of the strengthening phase particles with different sizes are particle A and particle B, a size of the particle A is less than or equal to 50 nm, and a size of the particle B is larger than 50 nm and less than or equal to 200 nm, a volume of the particle A accounts for 85-95% of a total volume of all the strengthening phase particles, and a content of the strengthening phases is 0.5-3.0 wt. %,
• wherein the matrix is a Fe—Cr—W—Ti alloy,
• wherein the strengthening phases comprise crystalline Y2O3, amorphous Y2O3, Y—Ti—O, Y—Cr—O and Y—W—O.