Investigation of pre-existing pores in creep loaded 9Cr steel

Surya Deo Yadav; Joerdis Rosc; Bernhard Sartory; Roland Brunner; Bernhard Sonderegger; Christof Sommitsch; Maria Cecilia Poletti

doi:10.1002/9781118990278.ch14

Investigation of pre-existing pores in creep loaded 9Cr steel

Surya Deo Yadav, Joerdis Rosc, Bernhard Sartory, Roland Brunner, Bernhard Sonderegger, Christof Sommitsch, Maria Cecilia Poletti

Institute of Materials Science, Joining and Forming (3030)

Research output: Chapter in Book/Report/Conference proceeding › Conference paper › peer-review

Abstract

Creep failure of materials under service conditions strongly rely on the formation and growth of cavities, encouraging the characterization and modelling of the cavitation process. In the present work pre-existing pores from manufacturing process are investigated in 9Cr steel creep loaded for up to 9000 hours. Scanning electron microscopy (SEM) is used for 2D analysis while Computer tomography (CT) is employed for 3D exploration. Nearest neighbours distances in 3D are calculated from 2D measurements and are decreasing with creep exposure time. The pore growth is studied applying a physical growth model, and experimental results are compared with numerical simulation. From this research it is deduced that damage occurs by agglomeration and growth of pre-existing cavities. The developed model can predict the growth of pores as a function of temperature and load at service.

Original language	English
Title of host publication	3DMS 2014 - Proceedings of the 2nd International Congress on 3D Materials Science
Place of Publication	Hoboken, NJ, USA
Publisher	John Wiley & Sons, Inc
Pages	85-90
Number of pages	6
ISBN (Print)	9781118945452
DOIs	https://doi.org/10.1002/9781118990278.ch14
Publication status	Published - 2014
Event	2nd International Congress on 3D Materials Science, 3DMS 2014 - Annecy, France Duration: 29 Jun 2014 → 2 Jul 2014

Conference

Conference	2nd International Congress on 3D Materials Science, 3DMS 2014
Country/Territory	France
City	Annecy
Period	29/06/14 → 2/07/14

Keywords

Cavity growth
Computed tomography
Martensitic steel
Modelling
P91

ASJC Scopus subject areas

Mechanics of Materials
Materials Science(all)

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10.1002/9781118990278.ch14

Cite this

Investigation of pre-existing pores in creep loaded 9Cr steel. / Yadav, Surya Deo; Rosc, Joerdis; Sartory, Bernhard; Brunner, Roland; Sonderegger, Bernhard ; Sommitsch, Christof ; Poletti, Maria Cecilia.

3DMS 2014 - Proceedings of the 2nd International Congress on 3D Materials Science. Hoboken, NJ, USA : John Wiley & Sons, Inc, 2014. p. 85-90.

Research output: Chapter in Book/Report/Conference proceeding › Conference paper › peer-review

Yadav, SD, Rosc, J, Sartory, B, Brunner, R, Sonderegger, B , Sommitsch, C & Poletti, MC 2014, Investigation of pre-existing pores in creep loaded 9Cr steel. in 3DMS 2014 - Proceedings of the 2nd International Congress on 3D Materials Science. John Wiley & Sons, Inc, Hoboken, NJ, USA, pp. 85-90, 2nd International Congress on 3D Materials Science, 3DMS 2014, Annecy, France, 29/06/14. https://doi.org/10.1002/9781118990278.ch14

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abstract = "Creep failure of materials under service conditions strongly rely on the formation and growth of cavities, encouraging the characterization and modelling of the cavitation process. In the present work pre-existing pores from manufacturing process are investigated in 9Cr steel creep loaded for up to 9000 hours. Scanning electron microscopy (SEM) is used for 2D analysis while Computer tomography (CT) is employed for 3D exploration. Nearest neighbours distances in 3D are calculated from 2D measurements and are decreasing with creep exposure time. The pore growth is studied applying a physical growth model, and experimental results are compared with numerical simulation. From this research it is deduced that damage occurs by agglomeration and growth of pre-existing cavities. The developed model can predict the growth of pores as a function of temperature and load at service.",

keywords = "Cavity growth, Computed tomography, Martensitic steel, Modelling, P91",

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AU - Yadav, Surya Deo

AU - Rosc, Joerdis

AU - Sartory, Bernhard

AU - Brunner, Roland

AU - Sonderegger, Bernhard

AU - Sommitsch, Christof

AU - Poletti, Maria Cecilia

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N2 - Creep failure of materials under service conditions strongly rely on the formation and growth of cavities, encouraging the characterization and modelling of the cavitation process. In the present work pre-existing pores from manufacturing process are investigated in 9Cr steel creep loaded for up to 9000 hours. Scanning electron microscopy (SEM) is used for 2D analysis while Computer tomography (CT) is employed for 3D exploration. Nearest neighbours distances in 3D are calculated from 2D measurements and are decreasing with creep exposure time. The pore growth is studied applying a physical growth model, and experimental results are compared with numerical simulation. From this research it is deduced that damage occurs by agglomeration and growth of pre-existing cavities. The developed model can predict the growth of pores as a function of temperature and load at service.

AB - Creep failure of materials under service conditions strongly rely on the formation and growth of cavities, encouraging the characterization and modelling of the cavitation process. In the present work pre-existing pores from manufacturing process are investigated in 9Cr steel creep loaded for up to 9000 hours. Scanning electron microscopy (SEM) is used for 2D analysis while Computer tomography (CT) is employed for 3D exploration. Nearest neighbours distances in 3D are calculated from 2D measurements and are decreasing with creep exposure time. The pore growth is studied applying a physical growth model, and experimental results are compared with numerical simulation. From this research it is deduced that damage occurs by agglomeration and growth of pre-existing cavities. The developed model can predict the growth of pores as a function of temperature and load at service.

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KW - Modelling

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Investigation of pre-existing pores in creep loaded 9Cr steel

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Keywords

ASJC Scopus subject areas

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