Creep damage evaluation of 9Cr–1Mo–V–Nb steel welded joints showing Type IV fracture

Watanabe, Takashi; Tabuchi, Masaaki; Yamazaki, Masayoshi; Hongo, Hiromichi; Tanabe, Tatsuhiko

doi:10.1016/j.ijpvp.2005.09.004

Cited by 156 publications

(82 citation statements)

References 17 publications

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“…The creep rupture time in HAZ is approximately 1/5 of the parent material. The number of creep cavities per area increases with the creep damage process and the highest density of creep cavities is located in the mid-thickness (or the center of the fine-grained heat-affected zone) region which is about 60% creep damage rather than the surface region of the fine-grained heat-affected zone [18,[30][31][32][33]. The tri-axial stress state will accelerate the creep damage evaluation in the HAZ.…”

Section: P91 Steel Weldmentmentioning

confidence: 99%

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Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

et al. 2013

AMR

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Abstract. Creep damage is one of the serious problems for the high temperature industries and computational approach (such as continuum damage mechanics) has been developed and used, complementary to the experimental approach, to assist safe operation. However, there are no ready creep damage constitutive equations to be used for predicting the lifetime for this type of alloy, particularly for low stress. This paper presents an analysis of the cavity nucleation, growth and coalescence mechanism of 9Cr-1Mo-VNb steel (P91 type) under high and low stress levels and multi-axial stress state.

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Section: P91 Steel Weldmentmentioning

confidence: 99%

“…The tri-axial stress state will accelerate the creep damage evaluation in the HAZ. However, it may not affect the growth and coarsening of precipitates rates during the creep phenomena [18,[30][31][32][33].…”

Section: P91 Steel Weldmentmentioning

confidence: 99%

Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

et al. 2013

AMR

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“…A considerable amount of work has been carried out in understanding power plant weldments under sustained loads at elevated temperature i.e. the creep behaviour of welded joints (see [1][2][3][4][5][6][7][8]). However, modern power plants are required to operate in a flexible mode of operation in order to compliment the unpredictable nature of renewable energies and to respond quickly to peak demands.…”

Section: Introductionmentioning

confidence: 99%

High Temperature, Low Cycle Fatigue Characterisation of P91 Weld and Heat Affected Zone Material

Farragher

Scully²,

O’Dowd

et al. 2013

Volume 6A: Materials and Fabrication

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The high temperature low cycle fatigue behaviour of P91 weld metal (WM) and weld joints (cross-weld) is presented. Strain-controlled tests have been carried out at 400 o C and 500 o C. The cyclic behaviour of the weld material (WM) and cross-weld (CW) specimens are compared with previously published base material (BM) tests.The weld material is shown to give a significantly harder and stiffer stress-strain response than both the base material and the cross-weld material. The cross-weld tests exhibited a cyclic stress-strain response which was similar to that of the base material. All specimen types exhibited cyclic softening but the degree of softening exhibited by the cross-weld specimens was lower than that of the base material and all-weld tests. Finite element models of the base metal, weld metal and cross-weld test specimens are developed and employed for identification of the cyclic viscoplasticity material parameters. Heat affected zone (HAZ) cracking was observed for the crossweld tests.

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“…A PWHT becomes helpful in improvement of weld joint from type IV failure [2][8] [9]. It was observed that rupture location of weld joint of P91 steel shifted from weld metal at higher stress condition to fine grain HAZ adjacent to base metal zone at a lower stress condition [10].…”

Section: Weldability P91 Steelmentioning

confidence: 99%

A Review of Effect of Welding and Post Weld Heat Treatment on Microstructure and Mechanical Properties of Grade 91 Steel

Samir¹

2015

IJRET

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Creep damage evaluation of 9Cr–1Mo–V–Nb steel welded joints showing Type IV fracture

Cited by 156 publications

References 17 publications

Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

High Temperature, Low Cycle Fatigue Characterisation of P91 Weld and Heat Affected Zone Material

A Review of Effect of Welding and Post Weld Heat Treatment on Microstructure and Mechanical Properties of Grade 91 Steel

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