Power-law Creep Behavior of Single-phase Metallic Materials: Its Understanding and Unsolved Problems Part 1

Oikawa, Hiroshi

doi:10.2320/materia.49.49

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Due to the reverse-transition-type creep behavior described above, the decreases in strain rate in the transition creep region are small. Since the minimum strain rate at the same temperature is lower as the Co content rises, creep strengthening is caused by the addition of Co. Reverse-transition-type creep is a characteristic feature of alloys 43) in which solid solution strengthening occurs due to the solute drag mechanism. Since this behavior is observed even in the 15Cr steel to which Co was not added, it is likely that solute drag is caused by the solid solution Cr.…”

Section: Creep Deformation Behaviormentioning

confidence: 99%

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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Section: Creep Deformation Behaviormentioning

confidence: 99%