AP-FIM study on the effect of Mo addition on microstructure in Ti-Nb steel

R. Uemori, R. Chijiiwa, H. Tamehiro, H. Morikawa

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AP-FIM technique was applied successfully to analyze the strengthening mechanism of a newly developed Ti-Nb-Mo-bearing fire-resistant steel, which maintained high yield strength at elevated temperatures. FIM observations of Ti-Nb-Mo and Ti-Nb steels before and after aging at 873 K for 0.9 ks made it clear that Nb(C, N) precipitated in ferrite matrix of Ti-Nb-Mo steel during aging was finer in size (2.3 nm) and greater in number than that of Ti-Nb steel. In the as-hot-rolled condition, corresponding to the situation before aging of those steels, a similar tendency was recognized with Nb(C, N), being coarse in size and small in number. These facts suggest that precipitation hardening of Nb(C, N) at 873 K and room temperature in Ti-Nb-Mo steel is higher than that in Ti-Nb steel. AP analyses of Mo-bearing steels, Ti-Mo steel and Ti-Nb-Mo steel, before and after aging, clearly yielded us two important facts. One was that almost all Mo atoms were in solution in ferrite matrix of both of the Mo-bearing steels, which suggested Mo solid-solution hardening was equal for both of the Mo-bearing steels. The other was that Mo atoms strongly segregated at the Nb(C, N)/ferrite matrix interface in Ti-Nb-Mo steel, which probably suppressed the diffusion of Nb atoms into Nb(C, N) from ferrite matrix. This directly results in fine precipitates in Ti-Nb-Mo steel.

Original languageEnglish
Pages (from-to)255-260
Number of pages6
JournalApplied Surface Science
Issue numberC
Publication statusPublished - Mar 2 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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