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Fujita, Toshio; SASAKURA, Toshihiko; TAKENO, Yosuke; OSAWA, Hideo; MATSUOKA, Reijiro; YAMADA, Seikichi; SAKABE, Kiyozo; HOMMA, Ryosuke

doi:10.2355/tetsutohagane1955.49.3_597

Cited by 2 publications

(2 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…Although Co addition has been reported as effective for creep strengthening in ferritic heat-resistant steels, 14,[22][23][24][25][26][27][28] its effectiveness depends on the composition of the steel or the temperature and time of the creep test. [29][30][31][32][33][34] With respect to chemical composition, Co addition was effective for creep strengthening in heat-resistant steels with Cr contents of 9 or 15 mass%, 14,[22][23][24][25][26][27][28] but in these cases, the samples had a single-phase martensite or ferrite structure. In contrast, several other studies concluded that the addition of Co was not effective for creep strengthening, but these investigations were conducted on heat-resistant steels with 10.5-12 mass% Cr contents that contained residual δ ferrite in part of the martensitic microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between Creep Strength and Magnetic Properties of Cobalt-bearing High Chromium Ferritic Steel

2021

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In this study, the relationship between changes in the magnetic properties and creep strength with the addition of 3 or 6 mass% Co was investigated for ferritic steel containing 15 mass% Cr. Co addition up to 6 mass% hardly contributed to solid solution strengthening or precipitation strengthening at room temperature. However, in the range of 650 to 750°C, the steel with the larger amount of Co exhibited higher creep strength, which is explained by a reduction in the diffusion rate associated with a change in magnetic properties by Co addition. An increase of the volume magnetization of the steel with increasing Co content in the range from room temperature to about 800°C was confirmed. Comparing the difference in volume magnetization and the ratio of the creep strain rate for steels with different amounts of Co, a clear correlation was found. That is, at the temperature at which the difference in volume magnetization reached a maximum, the peak of the creep strain rate ratio was also observed. This result is explained as follows.In a low temperature region where the magnetization is large or in a high temperature region above the Curie point of both steels, the steels exhibit no significant difference in the creep strength. However, at a temperature where one steel loses its ferromagnetism but the other steel retains it, a significant difference in the creep strength is observed.

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