Creep deformation and rupture behaviour of service exposed P91 weld and base steel measured by miniature tensile creep testing

Erten, Deniz Taygun; Nguyen, Thanh Tuan; Jeong, Tae Min; Yoon, Kee Bong

doi:10.1080/09603409.2017.1381497

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…The chemical composition of the HAZ, base metal (BM), and weld metal (WM) were conducted by optical emission spectroscopy. The results are presented in Table 1 21 . Complete chemical composition satisfied the ASTM‐A335 (P91) specifications.…”

Section: Methodsmentioning

confidence: 69%

“…The results are presented in Table 1. 21 Complete chemical composition satisfied the ASTM-A335 (P91) specifications.…”

Section: Service-exposed Steam Pipe and Specimensmentioning

confidence: 87%

“…Creep tests with the HAZ and cross‐weld specimens were conducted during this study. The creep test data obtained for the BM and WM specimens in the previous study 21 were included in the analysis. The tests were conducted at stresses ranging from 182 to 238 MPa for BM, from 217 to 238 MPa for HAZ, and from 228 to 286 MPa for WM, as indicated in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…The Larson–Miller parameter (LMP) method is commonly used in industrial applications to predict the creep rupture life of materials 25,26 . In this study, the LMP values were calculated to predict the creep rupture life of the P91 steel through the HAZ, BM, and WM reported in our previous study, 21 using Equation (3) as follows:

LMP goodbreak= T ((), \log ((), t_{r}) goodbreak+ C)

where T is the temperature (in Kelvin),

t_{r}

is the creep rupture time (in hours), and C is the Larson–Miller constant, taken as 28.…”

Section: Methodsmentioning

confidence: 99%

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Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Lok

Yoon

2022

Fatigue Fract Eng Mat Struct

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Creep deformation and rupture behavior of welded joints from service‐exposed P91 steel were investigated by creep tests and microstructure examination. A series of miniature tensile creep tests were conducted at 569°C under applied stresses ranging from 182.5 to 286 MPa for the heat‐affected zone (HAZ), base metal, and weld metal. Creep deformation behavior was modeled using the experimentally measured creep strain data as the primary creep‐secondary creep (PC‐SC) model and fitting closely with the measured creep curves of each metal. Power‐law type creep equations were employed to describe the primary and secondary creep behavior. The creep rupture life of the cross‐weld specimen was predicted using the PC‐SC model with HAZ properties. An accurate prediction was possible if the stress in estimation was increased to 1.14 times of the actual applied stress. The creep test results with the cross‐weld specimens were used for verification. Applying the Monkman–Grant relationship and the creep damage tolerance factors to the cross‐weld joint life prediction are also discussed.

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Section: Methodsmentioning

confidence: 69%

“…The results are presented in Table 1. 21 Complete chemical composition satisfied the ASTM-A335 (P91) specifications.…”

Section: Service-exposed Steam Pipe and Specimensmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

LMP goodbreak= T ((), \log ((), t_{r}) goodbreak+ C)

where T is the temperature (in Kelvin),

t_{r}

is the creep rupture time (in hours), and C is the Larson–Miller constant, taken as 28.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Lok

Yoon

2022

Fatigue Fract Eng Mat Struct

Self Cite

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“…3 ASME T/P92 martensitic heat resistant steel (9Cr-1.8W-0.5Mo-NbV), developed by the Nippon Steel Corporation of Japan, has been widely recognized as an ideal material for USC components, since it possesses considerably high creep resistance, low oxidation rate, and well-welding performance. 4 However, compared with T/P92 base metal (BM), the extent of damage in the fine-grained heataffected zone (HAZ) (FGHAZ) is more serious under creep stress, because type IV cracking frequently occurs at this region. This cracking reduces the lifespan of T92 joints and has become a worldwide concern.…”

Section: Introductionmentioning

confidence: 99%

Effect of multiaxial stress state on creep damage in ASME T92 welded joint

Wang

et al. 2019

Fatigue Fract Eng Mat Struct

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This study reports the type IV fracture process and the influence of multiaxial stress state in ASME T92 welded joints during creep. The type IV fracture occurs at the fine‐grained heat‐affected zone (ie, FGHAZ), involving void initiation, growth, and coalescence, microcrack occurrence, propagation and extension, and eventual macrocrack with consequent joint failure. The creep damage is not uniformly distributed along the thickness direction in the FGHAZ, and the central part of the welded joint is the most seriously damaged region. The equivalent creep strain is higher at the external surface, but the stress triaxiality is larger in the centre section. Large equivalent creep strain could promote creep void initiation, whereas high hydrostatic pressure and stress triaxiality factor accelerate void growth in the FGHAZ of T92 joints. Besides, reducing groove angle and HAZ width of the joints is recommended to delay the occurrence of type IV cracking because of lower equivalent creep strain and stress triaxiality factor.

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Prediction of the Creep Behavior of P91 Steel at 873 K Using Continuum Damage Mechanics Model

Ferdous

Alang

Alias

2022

Lecture Notes in Mechanical Engineering

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Creep deformation and rupture behaviour of service exposed P91 weld and base steel measured by miniature tensile creep testing

Cited by 10 publications

References 25 publications

Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Effect of multiaxial stress state on creep damage in ASME T92 welded joint

Prediction of the Creep Behavior of P91 Steel at 873 K Using Continuum Damage Mechanics Model

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