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

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

研究成果: ジャーナルへの寄稿記事

47 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)255-260
ページ数6
ジャーナルApplied Surface Science
76-77
発行部数C
DOI
出版物ステータス出版済み - 3 2 1994
外部発表Yes

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Steel
Microstructure
Bearings (structural)
Ferrite
Aging of materials
Atoms
Age hardening
Yield stress
Hardening
Precipitates
Solid solutions
Fires

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

これを引用

AP-FIM study on the effect of Mo addition on microstructure in Ti-Nb steel. / Uemori, R.; Chijiiwa, R.; Tamehiro, H.; Morikawa, H.

:: Applied Surface Science, 巻 76-77, 番号 C, 02.03.1994, p. 255-260.

研究成果: ジャーナルへの寄稿記事

Uemori, R. ; Chijiiwa, R. ; Tamehiro, H. ; Morikawa, H. / AP-FIM study on the effect of Mo addition on microstructure in Ti-Nb steel. :: Applied Surface Science. 1994 ; 巻 76-77, 番号 C. pp. 255-260.
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abstract = "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.",
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AB - 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.

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