The method for reproducing fine grained HAZ of W strengthened high Cr steel

Xue Wang, Qiang Xu, Hong wei Liu, Hong Liu, Wei Shang, Yao Yao Ren, Shu Min Yu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The methods for reproducing fine grained heat affected zone of high Cr steel for creep test were investigated. This research was motivated by the need for reproducing uniform FGHAZ to investigate the creep damage process and untangle the coupling between thermal aging and cavitation (nucleation, growth, and coalesce), and the influence of states of stress. The two methods for producing FGHAZ were weld simulator and heat treatment in furnace. The microstructures, hardness, and creep rupture time under 923 K/100 MPa were investigated and compared with the actual FGHAZ of a weld joint. The FGHAZ specimens, re-produced by heat treatment in furnace, were also crept and compared with that of the base metal at 923 K/110 MPa and 100 MPa. It was found that (1) both the re-produced FGHAZ showed the similar microstructures and hardness as that of actual FGHAZ of a welded joint, (2) both the re-produced FGHAZ demonstrated the similar creep rupture time and it was shorter than that of a weld joint, and (3) in comparison with the base metal, the creep test of FGHAZ, reproduced by heat treatment in furnace, shows a short transitional period and early occurrence of a tertiary stage. It is concluded that (1) the uniform FGHAZ reproduced via a weld simulator is in the order of 10–15 mm long and is not big enough for creep test and (2) heat treatment in furnace can reproduce the representative FGHAZ required for creep research.

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume589
DOIs
Publication statusPublished - 1 Jan 2014

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Steel
creep tests
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Heat treatment
welded joints
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Cite this

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title = "The method for reproducing fine grained HAZ of W strengthened high Cr steel",
abstract = "The methods for reproducing fine grained heat affected zone of high Cr steel for creep test were investigated. This research was motivated by the need for reproducing uniform FGHAZ to investigate the creep damage process and untangle the coupling between thermal aging and cavitation (nucleation, growth, and coalesce), and the influence of states of stress. The two methods for producing FGHAZ were weld simulator and heat treatment in furnace. The microstructures, hardness, and creep rupture time under 923 K/100 MPa were investigated and compared with the actual FGHAZ of a weld joint. The FGHAZ specimens, re-produced by heat treatment in furnace, were also crept and compared with that of the base metal at 923 K/110 MPa and 100 MPa. It was found that (1) both the re-produced FGHAZ showed the similar microstructures and hardness as that of actual FGHAZ of a welded joint, (2) both the re-produced FGHAZ demonstrated the similar creep rupture time and it was shorter than that of a weld joint, and (3) in comparison with the base metal, the creep test of FGHAZ, reproduced by heat treatment in furnace, shows a short transitional period and early occurrence of a tertiary stage. It is concluded that (1) the uniform FGHAZ reproduced via a weld simulator is in the order of 10–15 mm long and is not big enough for creep test and (2) heat treatment in furnace can reproduce the representative FGHAZ required for creep research.",
keywords = "9{\%}Cr steel, Creep, Heat affected zone, Microstructure, Reproduction method, Type IV cracking",
author = "Xue Wang and Qiang Xu and Liu, {Hong wei} and Hong Liu and Wei Shang and Ren, {Yao Yao} and Yu, {Shu Min}",
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The method for reproducing fine grained HAZ of W strengthened high Cr steel. / Wang, Xue; Xu, Qiang; Liu, Hong wei; Liu, Hong; Shang, Wei; Ren, Yao Yao; Yu, Shu Min.

In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 589, 01.01.2014, p. 50-56.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The method for reproducing fine grained HAZ of W strengthened high Cr steel

AU - Wang, Xue

AU - Xu, Qiang

AU - Liu, Hong wei

AU - Liu, Hong

AU - Shang, Wei

AU - Ren, Yao Yao

AU - Yu, Shu Min

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The methods for reproducing fine grained heat affected zone of high Cr steel for creep test were investigated. This research was motivated by the need for reproducing uniform FGHAZ to investigate the creep damage process and untangle the coupling between thermal aging and cavitation (nucleation, growth, and coalesce), and the influence of states of stress. The two methods for producing FGHAZ were weld simulator and heat treatment in furnace. The microstructures, hardness, and creep rupture time under 923 K/100 MPa were investigated and compared with the actual FGHAZ of a weld joint. The FGHAZ specimens, re-produced by heat treatment in furnace, were also crept and compared with that of the base metal at 923 K/110 MPa and 100 MPa. It was found that (1) both the re-produced FGHAZ showed the similar microstructures and hardness as that of actual FGHAZ of a welded joint, (2) both the re-produced FGHAZ demonstrated the similar creep rupture time and it was shorter than that of a weld joint, and (3) in comparison with the base metal, the creep test of FGHAZ, reproduced by heat treatment in furnace, shows a short transitional period and early occurrence of a tertiary stage. It is concluded that (1) the uniform FGHAZ reproduced via a weld simulator is in the order of 10–15 mm long and is not big enough for creep test and (2) heat treatment in furnace can reproduce the representative FGHAZ required for creep research.

AB - The methods for reproducing fine grained heat affected zone of high Cr steel for creep test were investigated. This research was motivated by the need for reproducing uniform FGHAZ to investigate the creep damage process and untangle the coupling between thermal aging and cavitation (nucleation, growth, and coalesce), and the influence of states of stress. The two methods for producing FGHAZ were weld simulator and heat treatment in furnace. The microstructures, hardness, and creep rupture time under 923 K/100 MPa were investigated and compared with the actual FGHAZ of a weld joint. The FGHAZ specimens, re-produced by heat treatment in furnace, were also crept and compared with that of the base metal at 923 K/110 MPa and 100 MPa. It was found that (1) both the re-produced FGHAZ showed the similar microstructures and hardness as that of actual FGHAZ of a welded joint, (2) both the re-produced FGHAZ demonstrated the similar creep rupture time and it was shorter than that of a weld joint, and (3) in comparison with the base metal, the creep test of FGHAZ, reproduced by heat treatment in furnace, shows a short transitional period and early occurrence of a tertiary stage. It is concluded that (1) the uniform FGHAZ reproduced via a weld simulator is in the order of 10–15 mm long and is not big enough for creep test and (2) heat treatment in furnace can reproduce the representative FGHAZ required for creep research.

KW - 9%Cr steel

KW - Creep

KW - Heat affected zone

KW - Microstructure

KW - Reproduction method

KW - Type IV cracking

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U2 - 10.1016/j.msea.2013.09.064

DO - 10.1016/j.msea.2013.09.064

M3 - Article

VL - 589

SP - 50

EP - 56

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 -