Short-term Creep Behavior Analysis of a Modified 9Cr-1Mo Steel

Park, Kyu Seop; Masuyama, Fujimitsu; Endo, Takao

doi:10.2355/tetsutohagane1955.84.7_526

Cited by 5 publications

(3 citation statements)

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“…(16) and LCR. The magnitude of depends on stress and slightly on temperature, 3) however, its magnitude is about 64 in the present case. There is some scattering, however, the magnitude within the brackets of eq.…”

Section: Relation Between Hardness and Lcrcontrasting

confidence: 50%

“…These creep curves are characterized by a relatively long primary creep common to tempered martensitic structure steels. 3) The measurements of Vickers hardness were carried out on the grip and gauge parts of crept specimens. For the convenience of description, the change in hardness ratio (H=H 0 ) from 657 to 18736 h and that of 22.4 to 1185 h are shown separately as a function of time in Figs.…”

Section: Change In Vickers Hardness Due To Creepmentioning

confidence: 99%

“…In order to meet the requirements for creep life assessment, studies on the constitutive equations, [3][4][5][6] the substructural evolution, [7][8][9] the growth of precipitates during creep, 10) and also the relation between creep strength and structures [11][12][13][14][15] have been investigated. Among these works, the observation reported by Kushima et al 14) is worthy of attention.…”

Section: Introductionmentioning

confidence: 99%

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Change in Vickers Hardness and Substructure during Creep of a Mod.9Cr-1Mo Steel

2003

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In order to investigate the structural degradation during creep, interrupted creep tests were conducted of a Mod.9Cr-1Mo steel in the range of stress and temperature from 71 to 167 MPa and 873 to 923 K. The change of hardness and tempered martensitic lath width were measured in grip and gauge parts of interrupted specimens. The lath structure was thermally stable in static conditions, however, it was not stable during creep and the structural change was enhanced by creep strain. The relation between the change in lath width and strain was described quantitatively. The change in Vickers hardness was expressed by a single valued function of creep life consumption ratio. Based on the empirical relation between strain and lath width, a model was proposed to describe the relation between change in hardness and creep life consumption ratio. The comparison of the model with the empirical relation suggests that about 65% of hardness loss is due to the decrease of dislocation density accompanied by the movement of lath boundaries. The role of precipitates on subboundaries was discussed in connection with the abnormal subgrain growth appearing in low stress regime.

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Section: Relation Between Hardness and Lcrcontrasting

confidence: 50%

Section: Change In Vickers Hardness Due To Creepmentioning

confidence: 99%