Mechanism for Z-phase formation in 11CrMoVNbN martensitic heat-resistant steel

Myung Yeon Kim, Sung Min Hong, Kyu Ho Lee, Woo Sang Jung, Young Su Lee, Young-Kook Lee, Jae Hyeok Shim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The mechanism for the formation of Z-phase was investigated for samples of an 11CrMoVNbN steel aged at 593 °C for up to 50,000 h. X-ray diffraction indicates that Z-phase appears after 5000 h of aging, and its amount gradually increases up to 50,000 h aging at the expense of mainly Cr 2 N. Transmission electron microscopy shows that Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates, which forms due to the diffusion of V into the precipitates from the matrix. Nucleated Z-phase tends to grow relatively rapidly compared with the preexisting precipitates such as Nb(C,N) and M 23 C 6 . Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism rather than the transformation mechanism. The main difference in the aged samples is that the Nb content of Z-phase is lower and that Z-phase does not replace Cr 2 N completely, compared to the results of the crept samples.

Original languageEnglish
Pages (from-to)40-45
Number of pages6
JournalMaterials Characterization
Volume129
DOIs
Publication statusPublished - 2017 Jul 1

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Steel
Precipitates
precipitates
steels
heat
Aging of materials
rims
Creep
Nucleation
nucleation
Transmission electron microscopy
X ray diffraction
transmission electron microscopy
matrices
diffraction
Hot Temperature
x rays

All Science Journal Classification (ASJC) codes

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

Cite this

Kim, Myung Yeon ; Hong, Sung Min ; Lee, Kyu Ho ; Jung, Woo Sang ; Lee, Young Su ; Lee, Young-Kook ; Shim, Jae Hyeok. / Mechanism for Z-phase formation in 11CrMoVNbN martensitic heat-resistant steel. In: Materials Characterization. 2017 ; Vol. 129. pp. 40-45.
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abstract = "The mechanism for the formation of Z-phase was investigated for samples of an 11CrMoVNbN steel aged at 593 °C for up to 50,000 h. X-ray diffraction indicates that Z-phase appears after 5000 h of aging, and its amount gradually increases up to 50,000 h aging at the expense of mainly Cr 2 N. Transmission electron microscopy shows that Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates, which forms due to the diffusion of V into the precipitates from the matrix. Nucleated Z-phase tends to grow relatively rapidly compared with the preexisting precipitates such as Nb(C,N) and M 23 C 6 . Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism rather than the transformation mechanism. The main difference in the aged samples is that the Nb content of Z-phase is lower and that Z-phase does not replace Cr 2 N completely, compared to the results of the crept samples.",
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Mechanism for Z-phase formation in 11CrMoVNbN martensitic heat-resistant steel. / Kim, Myung Yeon; Hong, Sung Min; Lee, Kyu Ho; Jung, Woo Sang; Lee, Young Su; Lee, Young-Kook; Shim, Jae Hyeok.

In: Materials Characterization, Vol. 129, 01.07.2017, p. 40-45.

Research output: Contribution to journalArticle

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AU - Hong, Sung Min

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AU - Jung, Woo Sang

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AU - Lee, Young-Kook

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N2 - The mechanism for the formation of Z-phase was investigated for samples of an 11CrMoVNbN steel aged at 593 °C for up to 50,000 h. X-ray diffraction indicates that Z-phase appears after 5000 h of aging, and its amount gradually increases up to 50,000 h aging at the expense of mainly Cr 2 N. Transmission electron microscopy shows that Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates, which forms due to the diffusion of V into the precipitates from the matrix. Nucleated Z-phase tends to grow relatively rapidly compared with the preexisting precipitates such as Nb(C,N) and M 23 C 6 . Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism rather than the transformation mechanism. The main difference in the aged samples is that the Nb content of Z-phase is lower and that Z-phase does not replace Cr 2 N completely, compared to the results of the crept samples.

AB - The mechanism for the formation of Z-phase was investigated for samples of an 11CrMoVNbN steel aged at 593 °C for up to 50,000 h. X-ray diffraction indicates that Z-phase appears after 5000 h of aging, and its amount gradually increases up to 50,000 h aging at the expense of mainly Cr 2 N. Transmission electron microscopy shows that Z-phase nucleates in the V-enriched rim region of Cr 2 N precipitates, which forms due to the diffusion of V into the precipitates from the matrix. Nucleated Z-phase tends to grow relatively rapidly compared with the preexisting precipitates such as Nb(C,N) and M 23 C 6 . Z-phase seems to consume Cr 2 N by the nucleation and growth mechanism rather than the transformation mechanism. The main difference in the aged samples is that the Nb content of Z-phase is lower and that Z-phase does not replace Cr 2 N completely, compared to the results of the crept samples.

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