Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants

Xue Wang, Qiang Xu, Shu Min Yu, Lei Hu, Hong Liu, Yao Yao Ren

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Long term precipitation and coarsening of Laves-phase in tungsten strengthened 9% Cr steel under thermal aging at 923 K was investigated and reported in this paper. It experimentally measured the evolution of mean particle size, the number density, the volume fraction of Laves-phase precipitates, the partition coefficients of W and Mo in the matrix, as well as the change of hardness. Its main conclusions were: 1) Laves-phase nucleates and grows rapidly on grain boundaries and lath boundaries within the first 1500 h of aging time; 2) The two stages characteristics and kinetics of Laves-phase nucleation and growth which were determined experimentally; 3) The coarsening of Laves-phase is much faster than that of M23C6 carbides; 4) The precipitation of Laves-phase produces a pronounced matrix depletion of W and Mo atoms; and 5) The precipitated Laves-phase gives rise to weaker precipitation strengthening in comparison with M23C6 carbides, and causes the loss of hardness due to the depletion of Mo and W from the solid solution. This paper contributes to the knowledge of kinetics of Laves-phase precipitation and coarsening, providing the essential information for comparative investigation of creep damage mechanisms. This paper also contributes to the understanding the creep damage broadly.

LanguageEnglish
Pages219-228
Number of pages10
JournalMaterials Chemistry and Physics
Volume163
DOIs
Publication statusPublished - 1 Aug 2015

Fingerprint

Laves phases
Steel
Coarsening
power plants
Power plants
Aging of materials
steels
Carbides
Creep
Hardness
Tungsten
Kinetics
Thermal aging
Precipitates
Solid solutions
Volume fraction
Grain boundaries
Nucleation
Particle size
carbides

Cite this

Wang, Xue ; Xu, Qiang ; Yu, Shu Min ; Hu, Lei ; Liu, Hong ; Ren, Yao Yao. / Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants. In: Materials Chemistry and Physics. 2015 ; Vol. 163. pp. 219-228.
@article{ef6db0e0f4334870a2629874a0768d29,
title = "Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants",
abstract = "Long term precipitation and coarsening of Laves-phase in tungsten strengthened 9{\%} Cr steel under thermal aging at 923 K was investigated and reported in this paper. It experimentally measured the evolution of mean particle size, the number density, the volume fraction of Laves-phase precipitates, the partition coefficients of W and Mo in the matrix, as well as the change of hardness. Its main conclusions were: 1) Laves-phase nucleates and grows rapidly on grain boundaries and lath boundaries within the first 1500 h of aging time; 2) The two stages characteristics and kinetics of Laves-phase nucleation and growth which were determined experimentally; 3) The coarsening of Laves-phase is much faster than that of M23C6 carbides; 4) The precipitation of Laves-phase produces a pronounced matrix depletion of W and Mo atoms; and 5) The precipitated Laves-phase gives rise to weaker precipitation strengthening in comparison with M23C6 carbides, and causes the loss of hardness due to the depletion of Mo and W from the solid solution. This paper contributes to the knowledge of kinetics of Laves-phase precipitation and coarsening, providing the essential information for comparative investigation of creep damage mechanisms. This paper also contributes to the understanding the creep damage broadly.",
keywords = "Alloys, Annealing, Electron microscopy, Microstructure, Precipitation",
author = "Xue Wang and Qiang Xu and Yu, {Shu Min} and Lei Hu and Hong Liu and Ren, {Yao Yao}",
year = "2015",
month = "8",
day = "1",
doi = "10.1016/j.matchemphys.2015.07.032",
language = "English",
volume = "163",
pages = "219--228",
journal = "Materials Chemistry and Physics",
issn = "0254-0584",
publisher = "Elsevier BV",

}

Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants. / Wang, Xue; Xu, Qiang; Yu, Shu Min; Hu, Lei; Liu, Hong; Ren, Yao Yao.

In: Materials Chemistry and Physics, Vol. 163, 01.08.2015, p. 219-228.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants

AU - Wang, Xue

AU - Xu, Qiang

AU - Yu, Shu Min

AU - Hu, Lei

AU - Liu, Hong

AU - Ren, Yao Yao

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Long term precipitation and coarsening of Laves-phase in tungsten strengthened 9% Cr steel under thermal aging at 923 K was investigated and reported in this paper. It experimentally measured the evolution of mean particle size, the number density, the volume fraction of Laves-phase precipitates, the partition coefficients of W and Mo in the matrix, as well as the change of hardness. Its main conclusions were: 1) Laves-phase nucleates and grows rapidly on grain boundaries and lath boundaries within the first 1500 h of aging time; 2) The two stages characteristics and kinetics of Laves-phase nucleation and growth which were determined experimentally; 3) The coarsening of Laves-phase is much faster than that of M23C6 carbides; 4) The precipitation of Laves-phase produces a pronounced matrix depletion of W and Mo atoms; and 5) The precipitated Laves-phase gives rise to weaker precipitation strengthening in comparison with M23C6 carbides, and causes the loss of hardness due to the depletion of Mo and W from the solid solution. This paper contributes to the knowledge of kinetics of Laves-phase precipitation and coarsening, providing the essential information for comparative investigation of creep damage mechanisms. This paper also contributes to the understanding the creep damage broadly.

AB - Long term precipitation and coarsening of Laves-phase in tungsten strengthened 9% Cr steel under thermal aging at 923 K was investigated and reported in this paper. It experimentally measured the evolution of mean particle size, the number density, the volume fraction of Laves-phase precipitates, the partition coefficients of W and Mo in the matrix, as well as the change of hardness. Its main conclusions were: 1) Laves-phase nucleates and grows rapidly on grain boundaries and lath boundaries within the first 1500 h of aging time; 2) The two stages characteristics and kinetics of Laves-phase nucleation and growth which were determined experimentally; 3) The coarsening of Laves-phase is much faster than that of M23C6 carbides; 4) The precipitation of Laves-phase produces a pronounced matrix depletion of W and Mo atoms; and 5) The precipitated Laves-phase gives rise to weaker precipitation strengthening in comparison with M23C6 carbides, and causes the loss of hardness due to the depletion of Mo and W from the solid solution. This paper contributes to the knowledge of kinetics of Laves-phase precipitation and coarsening, providing the essential information for comparative investigation of creep damage mechanisms. This paper also contributes to the understanding the creep damage broadly.

KW - Alloys

KW - Annealing

KW - Electron microscopy

KW - Microstructure

KW - Precipitation

UR - http://www.scopus.com/inward/record.url?scp=84940461341&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2015.07.032

DO - 10.1016/j.matchemphys.2015.07.032

M3 - Article

VL - 163

SP - 219

EP - 228

JO - Materials Chemistry and Physics

T2 - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

ER -