Investigation on Long-term Creep Rupture Properties and Microstructure Stability of Fe-Ni based Alloy Ni-23Cr-7W at 700°C

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Long-term creep rupture properties and microstructural stability of Fe–Ni based alloy Ni–23Cr–7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 °C for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M23C6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson–Mehl–Avrami–Kolmogorov equation.
Original languageEnglish
JournalMaterials Science & Engineering: A
Volume565
Pages (from-to)285-291
ISSN0921-5093
DOIs
Publication statusPublished - 2013

Keywords

  • Long-term creep
  • Microstructural evolution
  • Microstructure stability
  • Fe–Ni basedalloy
  • HR6W

Cite this

@article{1bc0e2361db54e4192c4fbf94af04889,
title = "Investigation on Long-term Creep Rupture Properties and Microstructure Stability of Fe-Ni based Alloy Ni-23Cr-7W at 700°C",
abstract = "Long-term creep rupture properties and microstructural stability of Fe–Ni based alloy Ni–23Cr–7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 °C for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M23C6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson–Mehl–Avrami–Kolmogorov equation.",
keywords = "Long-term creep, Microstructural evolution, Microstructure stability, Fe–Ni basedalloy, HR6W",
author = "Tsuyoshi Tokairin and Dahl, {Kristian Vinter} and Danielsen, {Hilmar Kjartansson} and Grumsen, {Flemming Bjerg} and John Hald and Takashi Sato",
year = "2013",
doi = "10.1016/j.msea.2012.12.019",
language = "English",
volume = "565",
pages = "285--291",
journal = "Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

TY - JOUR

T1 - Investigation on Long-term Creep Rupture Properties and Microstructure Stability of Fe-Ni based Alloy Ni-23Cr-7W at 700°C

AU - Tokairin, Tsuyoshi

AU - Dahl, Kristian Vinter

AU - Danielsen, Hilmar Kjartansson

AU - Grumsen, Flemming Bjerg

AU - Hald, John

AU - Sato, Takashi

PY - 2013

Y1 - 2013

N2 - Long-term creep rupture properties and microstructural stability of Fe–Ni based alloy Ni–23Cr–7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 °C for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M23C6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson–Mehl–Avrami–Kolmogorov equation.

AB - Long-term creep rupture properties and microstructural stability of Fe–Ni based alloy Ni–23Cr–7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 °C for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M23C6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson–Mehl–Avrami–Kolmogorov equation.

KW - Long-term creep

KW - Microstructural evolution

KW - Microstructure stability

KW - Fe–Ni basedalloy

KW - HR6W

U2 - 10.1016/j.msea.2012.12.019

DO - 10.1016/j.msea.2012.12.019

M3 - Journal article

VL - 565

SP - 285

EP - 291

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

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

SN - 0921-5093

ER -