Microstructural development during high temperature creep of 9% Cr steel

Orlová, A.; Buršı́k, Jiřı́; Kuchařová, K.; Sklenička, V.

doi:10.1016/s0921-5093(97)00708-9

Cited by 116 publications

(48 citation statements)

References 10 publications

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“…Figure 2 shows that creep exposure of initial state caused slight changes in the LAGBs spacing both in the gauge length and in the area near to the fracture. Similar results were observed also in other works [2,4,8,10] devoted to creep behaviour of initial state and stability of microstructure during isothermal ageing. It was reported that isothermal ageing has negligible eect on subgrain growth by contrast to subgrain signicant growth during creep exposure.…”

Section: Microstructure Observationssupporting

confidence: 91%

Influence of Long-term Annealing and Hot Bending on Creep of P92 Pipe

Král

Dvořák²,

Kvapilová³

et al. 2015

Acta Phys. Pol. A

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This work is focused on the creep behaviour of the thick-walled hot bended P92 pipe, with an outer diameter of 350 mm and wall thickness of 39 mm, in its dierent parts, namely in straight parts and bends. Selected creep specimens machined from axial section of pipe were thermally aged at 650• C to simulate microstructure degradation typical for long-term service conditions. Subsequent tensile creep tests at constant load were performed at 600• C under 140 MPa and creep behaviour of various structure states was compared. Microstructure was investigated by scanning electron microscopy equipped with electron backscatter diraction. It was found that ageing at 650• C for 10 4 h caused the signicant reduction of creep resistance down to about 10% of initial state and an additional slight reduction of creep resistance after longer ageing for 2 × 10 4 h. Further, creep behaviour was signicantly inuenced by specimen position in the extrados and intrados parts of bends. Microstructure investigation revealed that long-term annealing has negligible eect on high-angle grain boundary spacing and misorientation. By contrast, creep deformation of long-term annealed specimens led to signicant decreasing in high-angle grain boundary spacing and caused a change in the misorientation distribution of boundaries.

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Section: Microstructure Observationssupporting

confidence: 91%

Influence of Long-term Annealing and Hot Bending on Creep of P92 Pipe

Král

Dvořák²,

Kvapilová³

et al. 2015

Acta Phys. Pol. A

View full text Add to dashboard Cite

show abstract

“…15) In addition, many papers have described that precipitates including carbides along lath boundaries restrain the movement of dislocations and it contributes to creep resistance. [5][6][7][8]15,[17][18][19] It is also recognized in this study that carbides act a key role as obstacles against coarsening of cellular dislocation network substructure.…”

Section: Microstructure Evolution Under Creep Deformationmentioning

confidence: 99%

“…Change in the widths is a key parameter in estimation of microstructural damage degree, and those sizes have been therefore investigated and discussed by many researchers. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Cell like dislocation substructure, socalled subgrain structure appears after the tempering heat treatment or in the course of the primary creep stage. Such substructure consists of hard walls in which dislocations…”

Section: Introductionmentioning

confidence: 99%