Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy

G. B. Viswanathan; Ken Bain; Dan Huber; S. Jha; S. Sam; J. Tiley; Christopher Woodward; H. L. Fraser

doi:10.1002/9781118516430.ch44

Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy

G. B. Viswanathan, Ken Bain, Dan Huber, S. Jha, S. Sam, J. Tiley, Christopher Woodward, H. L. Fraser

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

1 Citation (Scopus)

Abstract

Detailed transmission electron microscopy (TEM) studies were conducted on low cycle fatigue (LCF) sample of René 104 alloy samples tested under dwell conditions to analyze the deformation substructures. Specifically, the focus was to investigate the effect of crack length, in other words, stress intensity factor range AK, on the deformation substructures. Thin foils were prepared by focused ion beam method (FIB) from two specific grains along the crack path at varying distances representing varying AK values. The TEM analysis indicated that the character of deformation substructures significantly differed in these two grains. It is therefore speculated that local stress conditions and the grain orientations played a key role in the damage accumulation and subsequent substructure evolution. The regions below the fracture surface were also investigated. Detailed scanning electron microscopy (SEM) investigations of the grains immediately below the fracture surface revealed extensive nucrostructure degradation and potential hot spots for crack nucleation.

Original language	English
Title of host publication	Superalloys 2012
Subtitle of host publication	Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA
Editors	Eric S. Huron, Roger C. Reed, Mark C. Hardy, Michael J. Mills, Rick E. Montero, Pedro D. Portella, Jack Telesman
Place of Publication	Hoboken, New Jersey
Publisher	John Wiley & Sons
Pages	403-409
Number of pages	7
ISBN (Electronic)	9781118516430
ISBN (Print)	9780470943205
DOIs	https://doi.org/10.1002/9781118516430.ch44
Publication status	Published - 2012
Externally published	Yes
Event	International Symposium on Superalloys 2012 - Seven Springs, United States of America Duration: 9 Sept 2012 → 13 Sept 2012 Conference number: 12th

Conference

Conference	International Symposium on Superalloys 2012
Abbreviated title	Superalloys 2012
Country/Territory	United States of America
City	Seven Springs
Period	9/09/12 → 13/09/12

Keywords

Deformation
Dislocations
Dwell-fatigue
Low cycle fatigue
Superalloy
Transmission electron microscopy

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10.1002/9781118516430.ch44

Cite this

Viswanathan, G. B., Bain, K., Huber, D., Jha, S., Sam, S., Tiley, J., Woodward, C., & Fraser, H. L. (2012). Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy. In E. S. Huron, R. C. Reed, M. C. Hardy, M. J. Mills, R. E. Montero, P. D. Portella, & J. Telesman (Eds.), Superalloys 2012: Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA (pp. 403-409). John Wiley & Sons. https://doi.org/10.1002/9781118516430.ch44

Viswanathan, G. B. ; Bain, Ken ; Huber, Dan et al. / Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy. Superalloys 2012: Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA. editor / Eric S. Huron ; Roger C. Reed ; Mark C. Hardy ; Michael J. Mills ; Rick E. Montero ; Pedro D. Portella ; Jack Telesman. Hoboken, New Jersey : John Wiley & Sons, 2012. pp. 403-409

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title = "Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy",

abstract = "Detailed transmission electron microscopy (TEM) studies were conducted on low cycle fatigue (LCF) sample of Ren{\'e} 104 alloy samples tested under dwell conditions to analyze the deformation substructures. Specifically, the focus was to investigate the effect of crack length, in other words, stress intensity factor range AK, on the deformation substructures. Thin foils were prepared by focused ion beam method (FIB) from two specific grains along the crack path at varying distances representing varying AK values. The TEM analysis indicated that the character of deformation substructures significantly differed in these two grains. It is therefore speculated that local stress conditions and the grain orientations played a key role in the damage accumulation and subsequent substructure evolution. The regions below the fracture surface were also investigated. Detailed scanning electron microscopy (SEM) investigations of the grains immediately below the fracture surface revealed extensive nucrostructure degradation and potential hot spots for crack nucleation.",

keywords = "Deformation, Dislocations, Dwell-fatigue, Low cycle fatigue, Superalloy, Transmission electron microscopy",

author = "Viswanathan, {G. B.} and Ken Bain and Dan Huber and S. Jha and S. Sam and J. Tiley and Christopher Woodward and Fraser, {H. L.}",

year = "2012",

doi = "10.1002/9781118516430.ch44",

language = "English",

isbn = "9780470943205",

pages = "403--409",

editor = "Huron, {Eric S.} and Reed, {Roger C.} and Hardy, {Mark C.} and Mills, {Michael J.} and Montero, {Rick E.} and Portella, {Pedro D.} and Jack Telesman",

booktitle = "Superalloys 2012",

publisher = "John Wiley & Sons",

address = "United States of America",

note = "International Symposium on Superalloys 2012, Superalloys 2012 ; Conference date: 09-09-2012 Through 13-09-2012",

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Viswanathan, GB, Bain, K, Huber, D, Jha, S, Sam, S, Tiley, J, Woodward, C & Fraser, HL 2012, Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy. in ES Huron, RC Reed, MC Hardy, MJ Mills, RE Montero, PD Portella & J Telesman (eds), Superalloys 2012: Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA. John Wiley & Sons, Hoboken, New Jersey, pp. 403-409, International Symposium on Superalloys 2012, Seven Springs, Pennsylvania, United States of America, 9/09/12. https://doi.org/10.1002/9781118516430.ch44

Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy. / Viswanathan, G. B.; Bain, Ken; Huber, Dan et al.
Superalloys 2012: Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA. ed. / Eric S. Huron; Roger C. Reed; Mark C. Hardy; Michael J. Mills; Rick E. Montero; Pedro D. Portella; Jack Telesman. Hoboken, New Jersey: John Wiley & Sons, 2012. p. 403-409.

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

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T1 - Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy

AU - Viswanathan, G. B.

AU - Bain, Ken

AU - Huber, Dan

AU - Jha, S.

AU - Sam, S.

AU - Tiley, J.

AU - Woodward, Christopher

AU - Fraser, H. L.

N1 - Conference code: 12th

PY - 2012

Y1 - 2012

N2 - Detailed transmission electron microscopy (TEM) studies were conducted on low cycle fatigue (LCF) sample of René 104 alloy samples tested under dwell conditions to analyze the deformation substructures. Specifically, the focus was to investigate the effect of crack length, in other words, stress intensity factor range AK, on the deformation substructures. Thin foils were prepared by focused ion beam method (FIB) from two specific grains along the crack path at varying distances representing varying AK values. The TEM analysis indicated that the character of deformation substructures significantly differed in these two grains. It is therefore speculated that local stress conditions and the grain orientations played a key role in the damage accumulation and subsequent substructure evolution. The regions below the fracture surface were also investigated. Detailed scanning electron microscopy (SEM) investigations of the grains immediately below the fracture surface revealed extensive nucrostructure degradation and potential hot spots for crack nucleation.

AB - Detailed transmission electron microscopy (TEM) studies were conducted on low cycle fatigue (LCF) sample of René 104 alloy samples tested under dwell conditions to analyze the deformation substructures. Specifically, the focus was to investigate the effect of crack length, in other words, stress intensity factor range AK, on the deformation substructures. Thin foils were prepared by focused ion beam method (FIB) from two specific grains along the crack path at varying distances representing varying AK values. The TEM analysis indicated that the character of deformation substructures significantly differed in these two grains. It is therefore speculated that local stress conditions and the grain orientations played a key role in the damage accumulation and subsequent substructure evolution. The regions below the fracture surface were also investigated. Detailed scanning electron microscopy (SEM) investigations of the grains immediately below the fracture surface revealed extensive nucrostructure degradation and potential hot spots for crack nucleation.

KW - Deformation

KW - Dislocations

KW - Dwell-fatigue

KW - Low cycle fatigue

KW - Superalloy

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EP - 409

BT - Superalloys 2012

A2 - Huron, Eric S.

A2 - Reed, Roger C.

A2 - Hardy, Mark C.

A2 - Mills, Michael J.

A2 - Montero, Rick E.

A2 - Portella, Pedro D.

A2 - Telesman, Jack

PB - John Wiley & Sons

CY - Hoboken, New Jersey

T2 - International Symposium on Superalloys 2012

Y2 - 9 September 2012 through 13 September 2012

ER -

Viswanathan GB, Bain K, Huber D, Jha S, Sam S, Tiley J et al. Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy. In Huron ES, Reed RC, Hardy MC, Mills MJ, Montero RE, Portella PD, Telesman J, editors, Superalloys 2012: Proceedings of the 12th International Symposium on Superalloys, held, September 9-13, 2012, at Seven Springs Mountain Resort, Seven Springs, PA. Hoboken, New Jersey: John Wiley & Sons. 2012. p. 403-409 doi: 10.1002/9781118516430.ch44

Analysis of deformation substructures in a notched LCF sample under dwell condition in a Ni-based superalloy

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