Study on Dispersion Strengthening of Precipitation-Hardened Type 12% Cr Steel

Abstract

The authors made on effort to develop the material having superior elevated temperature properties by applying dispersion strengthening and liquid-phase sintering techniques in tile sintering of 12%Cr maraging steel powder, and the results obtained were as follows:
(1) Addition of a small amount of ferro-titanium alloy powder, which yields liquid phase at the sintering temperature, is effective for the improvement of the sintering characteristics of 12%Cr maraging steel powder.
(2) Sintered 12% Cr maraging steel with dispersed γ-Al₂O₃ exhibiting high creep rupture strength at the temperature of 550°C could be obtained. This sintered material has a superior creep rupture strength compared with similar sintered 13 CrMoTi steel examined separately.