9 Citations (Scopus)

Abstract

Alloy 617 is a primary candidate material to be used in the next generation of nuclear power plants. Structural materials for these plants are expected to undergo creep and fatigue at temperatures as high as 950 °C. This study uses a hybrid-control creep-fatigue loading profile, as opposed to the traditional strain-controlled loading, to generate creep dominated failure. Qualitative and quantitative image analysis through SEM, EDS, and EBSD, is used to show that hybrid control testing is capable of producing creep dominated failure and that time fraction approach is not a valid indicator of creep or fatigue dominated damage. The focus of image analysis is on surface fatigue cracks and internal creep voids. A creep-fatigue damage interaction diagram based on these micro-scale features is plotted. It is shown that the classical time fraction approach suggested by the ASME code does not agree with the experimental findings and has a poor correlation with observed microscale damage features. A new definition of creep damage fraction based on an effective hold time is found to correlate well with the micro-scale image analysis.

Original languageEnglish (US)
Pages (from-to)391-400
Number of pages10
JournalMaterials Science and Engineering A
Volume679
DOIs
StatePublished - Jan 2 2017

Fingerprint

Fatigue damage
Creep
image analysis
damage
Image analysis
nuclear power plants
microbalances
voids
cracks
diagrams
Fatigue of materials
scanning electron microscopy
profiles
Nuclear power plants
Energy dispersive spectroscopy
interactions
Scanning electron microscopy
temperature
Testing

Keywords

  • Alloy 617
  • Creep-fatigue
  • Imaging
  • Interaction diagram
  • Void

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Image-based creep-fatigue damage mechanism investigation of Alloy 617 at 950 °C. / Tahir, Fraaz; Dahire, Sonam; Liu, Yongming.

In: Materials Science and Engineering A, Vol. 679, 02.01.2017, p. 391-400.

Research output: Contribution to journalArticle

@article{f145527b20884d9ba36e3f8c24992356,
title = "Image-based creep-fatigue damage mechanism investigation of Alloy 617 at 950 °C",
abstract = "Alloy 617 is a primary candidate material to be used in the next generation of nuclear power plants. Structural materials for these plants are expected to undergo creep and fatigue at temperatures as high as 950 °C. This study uses a hybrid-control creep-fatigue loading profile, as opposed to the traditional strain-controlled loading, to generate creep dominated failure. Qualitative and quantitative image analysis through SEM, EDS, and EBSD, is used to show that hybrid control testing is capable of producing creep dominated failure and that time fraction approach is not a valid indicator of creep or fatigue dominated damage. The focus of image analysis is on surface fatigue cracks and internal creep voids. A creep-fatigue damage interaction diagram based on these micro-scale features is plotted. It is shown that the classical time fraction approach suggested by the ASME code does not agree with the experimental findings and has a poor correlation with observed microscale damage features. A new definition of creep damage fraction based on an effective hold time is found to correlate well with the micro-scale image analysis.",
keywords = "Alloy 617, Creep-fatigue, Imaging, Interaction diagram, Void",
author = "Fraaz Tahir and Sonam Dahire and Yongming Liu",
year = "2017",
month = "1",
day = "2",
doi = "10.1016/j.msea.2016.10.050",
language = "English (US)",
volume = "679",
pages = "391--400",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Image-based creep-fatigue damage mechanism investigation of Alloy 617 at 950 °C

AU - Tahir, Fraaz

AU - Dahire, Sonam

AU - Liu, Yongming

PY - 2017/1/2

Y1 - 2017/1/2

N2 - Alloy 617 is a primary candidate material to be used in the next generation of nuclear power plants. Structural materials for these plants are expected to undergo creep and fatigue at temperatures as high as 950 °C. This study uses a hybrid-control creep-fatigue loading profile, as opposed to the traditional strain-controlled loading, to generate creep dominated failure. Qualitative and quantitative image analysis through SEM, EDS, and EBSD, is used to show that hybrid control testing is capable of producing creep dominated failure and that time fraction approach is not a valid indicator of creep or fatigue dominated damage. The focus of image analysis is on surface fatigue cracks and internal creep voids. A creep-fatigue damage interaction diagram based on these micro-scale features is plotted. It is shown that the classical time fraction approach suggested by the ASME code does not agree with the experimental findings and has a poor correlation with observed microscale damage features. A new definition of creep damage fraction based on an effective hold time is found to correlate well with the micro-scale image analysis.

AB - Alloy 617 is a primary candidate material to be used in the next generation of nuclear power plants. Structural materials for these plants are expected to undergo creep and fatigue at temperatures as high as 950 °C. This study uses a hybrid-control creep-fatigue loading profile, as opposed to the traditional strain-controlled loading, to generate creep dominated failure. Qualitative and quantitative image analysis through SEM, EDS, and EBSD, is used to show that hybrid control testing is capable of producing creep dominated failure and that time fraction approach is not a valid indicator of creep or fatigue dominated damage. The focus of image analysis is on surface fatigue cracks and internal creep voids. A creep-fatigue damage interaction diagram based on these micro-scale features is plotted. It is shown that the classical time fraction approach suggested by the ASME code does not agree with the experimental findings and has a poor correlation with observed microscale damage features. A new definition of creep damage fraction based on an effective hold time is found to correlate well with the micro-scale image analysis.

KW - Alloy 617

KW - Creep-fatigue

KW - Imaging

KW - Interaction diagram

KW - Void

UR - http://www.scopus.com/inward/record.url?scp=84992603214&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84992603214&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2016.10.050

DO - 10.1016/j.msea.2016.10.050

M3 - Article

AN - SCOPUS:84992603214

VL - 679

SP - 391

EP - 400

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -