Investigation of Pre‐Existing Pores in Creep Loaded 9Cr Steel

Yadav, Surya Deo; Rosc, J.; Sartory, Bernhard; Brunner, Roland; Sonderegger, Bernhard; Sommitsch, Christof; Poletti, María Cecilia

doi:10.1002/9781118990278.ch14

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…17 In the authors knowledge, there is no clear correlation of the final damage with the cavities which are formed during creep, neither by the evolution of pre-existing ones. 9 This lack in the literature is our first motivation to study the evolution of these two types of cavities separately. The second motivation is to explore the difference in damage quantification between 2D stereological analysis and 3D serial sectioning for a given morphology of cavities.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, nucleated micro or any pre-existing cavities 9 have the tendency to grow either by diffusion, plasticity or by coupled diffusion and plasticity, transforming to macro cavities. 6,7,9 Finally, coalescence of these macro cavities leads to the rupture. In 9Cr steels it has been reported that cavities are nucleated at coarse precipitates such as at second phase particles and along grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 These are vacancy accumulation, grain boundary sliding (GBS) and dislocation pile-ups. Furthermore, nucleated micro or any pre-existing cavities 9 have the tendency to grow either by diffusion, plasticity or by coupled diffusion and plasticity, transforming to macro cavities. 6,7,9 Finally, coalescence of these macro cavities leads to the rupture.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterisation and quantification of cavities in 9Cr martensitic steel for power plants

Yadav

Sonderegger

Sartory

et al. 2015

Materials Science and Technology

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This work focuses on the characterisation of cavities evolution in a P91 steel pipe in three conditions: as received, and after creep at 650uC and 60 MPa for 7000 and 9000 h. A field emission gun scanning electron microscope (FEG-SEM) equipped with focused ion beam (FIB) gun, a conventional scanning electron microscope (SEM) and a light optical microscope (LOM) have been employed for the investigation. This study reveals two types of cavities: the preexisting cavities, which are rare in this type of heat resistant steels, with a mean diameter of 2?56 mm and the cavities produced during creep with diameters smaller than 0?6 mm. Lath boundaries and precipitates are found to be preferential sites for cavity nucleation. Furthermore, the number density and volume fraction of these small cavities are calculated from 2D measurements and compared to 3D results obtained by FIB serial sectioning.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterisation and quantification of cavities in 9Cr martensitic steel for power plants

Yadav

Sonderegger

Sartory

et al. 2015

Materials Science and Technology

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Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach

Yadav

Sonderegger

Stracey

et al. 2016

Materials Science and Engineering: A

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Zone-wise investigation of creep behaviour 9Cr–1Mo steel weld joints

Yadav

Vasantharaja

Riedlsperger

et al. 2019

Materials Science and Technology

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Distinct regions such as weld metal, heat-affected zone (HAZ) and base metal of P9 steel weld joints fabricated by various welding processes were investigated using impression creep testing. Smaller prior austenitic grain size, lower density of precipitates and dislocations resulted in faster recovery and higher creep rate of HAZ in comparison to the weld and base metal. Compared to base metal, shielded metal arc weld (SMAW) and activated tungsten inert gas (A-TIG) weld of the P9 steel weld joints exhibited better resistance to creep and displayed higher activation energy due to their coarser prior austenite grain size. A-TIG HAZ exhibited superior creep properties compared to the SMAW and TIG HAZ due to the presence of higher number density of precipitates.

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Investigation of Pre‐Existing Pores in Creep Loaded 9Cr Steel

Cited by 3 publications

References 12 publications

Characterisation and quantification of cavities in 9Cr martensitic steel for power plants

Characterisation and quantification of cavities in 9Cr martensitic steel for power plants

Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach

Zone-wise investigation of creep behaviour 9Cr–1Mo steel weld joints

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