Microstructure and type IV cracking behavior of HAZ in P92 steel weldment

Wang, Xue; Qian-gang, Pan; Ren, Yaoyao; Shang, Wei; Zeng, Hui-qiang; Hong, Liu

doi:10.1016/j.msea.2012.05.076

Cited by 62 publications

(34 citation statements)

References 17 publications

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“…The shift in failure location from base metal to FGHAZ with increase in rupture life (decrease in applied stress) was accompanied with the drastic reduction in rupture ductility. Similar, low ductility failure has been reported on P92 steel weld joint at applied stresses of 120 MPa and below at 923 K by Wang Xue et al, [17]. In the present study, the failure in the FGHAZ at 923 K has been observed for applied stresses of 110 MPa and below.…”

Section: Creep Deformation and Rupture Behaviour Of Weld Joint And Hazssupporting

confidence: 90%

Integrity Assessment of Grade 92 Welded Joint under Creep Condition

Sakthivel

Laha

Chandravathi

et al. 2014

Procedia Engineering

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Integrity of tempered martensitic grade 92 (9Cr-1.8W-0.5Mo-VNb) steel welded joint has been assessed by carrying out creep test at 923 K over a wide stress range. The failure location in the joint was found to shift from base metal to heat affected zone (HAZ) of the weld joint with decrease in applied stress. The HAZ of the weld joint consisted of coarse prior-austenite grain (CGHAZ), fine prior-austenite grain (FGHAZ) and intercritical (ICHAZ) regions in a sequence from the fusion boundary to unaffected base metal. The failure was associated with localized creep deformation coupled with creep cavitation. To have a better insight to the creep failure behaviour of the joint, the different microstructural constituents of HAZ of the joint has been simulated. Creep and tensile tests were carried out on the simulated HAZs specimens. The steel suffered degradation in creep rupture strength on subjecting heating in the intercritical (between Ac 1 and Ac 3 ) (ICHAZ) as well as at temperature just above the Ac 3 (FCHAZ). The extensive creep cavitation has been observed in the simulated FGHAZ of the joint. Similarly, localized extensive creep cavitation and precipitation of tungsten rich Laves phase has been observed in the FGHAZ of the weld joint. This caused the type IV failure in the FGHAZ of the weld joint. The integrity of grade 92 steel joint under creep condition is governed by the above microstructural modifications of the steel in HAZ by weld thermal cycle.

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Section: Creep Deformation and Rupture Behaviour Of Weld Joint And Hazssupporting

confidence: 90%

Integrity Assessment of Grade 92 Welded Joint under Creep Condition

Sakthivel

Laha

Chandravathi

et al. 2014

Procedia Engineering

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“…The understanding of type IV cracking would help designers and operators make the right decisions to maximize overall safety, operating efficiency and plant availability during designing, operating, or repairing plant. In the past decade, many works have been carried out to clarify the main cause of type IV cracking [17][18][19][20][21][22]. However, the cause of reduced creep strength has not yet been clarified.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of 10% Cr martensitic heat-resistant steel welded joints and type IV cracking behavior during creep rupture at 650°C

Zhang

Zhao

et al. 2015

Materials Science and Engineering: A

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“…Figure 8 shows the stress against LMP for P92 weldment at two different temperatures. Note that the rupture data at 650°C that is used to calculate the LMP is taken from [8]. Using the parameter, C=36.0, all the data can be fit by a single curve regardless of the temperature.…”

Section: Creep Deformation and Rupture Behaviourmentioning

confidence: 99%

“…The test does not only help to understand the creep behaviour, but it is also essential when deriving the constitutive creep model which is the requirement for predictive modelling. As the creep behaviour of weld metal is different from base metal particularly at longterm where type IV cracking controlled the failure [8] and also responsible for the drop in creep strength and ductility, having sufficient creep data for weldment is also important to further investigate the material performance.…”

Section: Introductionmentioning

confidence: 99%

Characterization of creep deformation and rupture behaviour of P92 steel weldment at 600°C

Alang¹

2018

J. Mech. Eng. Sci.

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P92 steel is a potential candidate for ultra-supercritical (USC) plant component. Thus, its suitability and performance for future service are still under investigation. Understanding the creep behaviour is essential to design the components that can sustain in service over a certain period. With the intention to investigate the creep deformation and rupture behaviour of P92 steel weldment, four cross-weld creep specimens were prepared and tested at 600°C at different stress levels. All specimens ruptured between 400 and 4,000 hours. Following the creep test, fractography examination was performed. P92 steel weldment exhibits clear primary, secondary and tertiary creep deformation stages. At long-term, the time portion for primary deformation as compared to rupture time reduces, however, secondary stage is observed to dominate. Deformation and rupture data obeys the power law relation which indicates the material deforms at a higher rate and rupture earlier as the stress increases. Ductility of P92 steel weldment reduces as the stress decreases. A strong correlation between minimum creep strain rate and time to rupture is observed when the data is fitted using original Monkman-Grant (MG) and Modified Monkman-Grant (MMG) relations. Examination of fracture surface reveals that at high stress, transgranular-type of fracture is dominant. As creep time increases, a mixture between the intergranular and transgranular fracture is evidence.

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Microstructure and type IV cracking behavior of HAZ in P92 steel weldment

Cited by 62 publications

References 17 publications

Integrity Assessment of Grade 92 Welded Joint under Creep Condition

Integrity Assessment of Grade 92 Welded Joint under Creep Condition

Microstructure of 10% Cr martensitic heat-resistant steel welded joints and type IV cracking behavior during creep rupture at 650°C

Characterization of creep deformation and rupture behaviour of P92 steel weldment at 600°C

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