Experimental and numerical investigations of the creep behaviour of the dissimilar weldment GS‐17 CrMoV 5 11 and X 20 CrMoV 12 1

Buchmayr, Bruno; Cerjak, Horst-Hannes; Witwer, M.; Maile, Karl; Theofel, Heinrich; Eckert, W.

doi:10.1002/srin.199000346

Cited by 4 publications

(2 citation statements)

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“…A model has predicted that co-relation between effects of coarsening law; an applied stress has been a threshold stress that has been proportional to Orwan stress. This threshold stress of model has been due to strengthening effect of dispersed phases [16]. 9Cr-Mo-Nb-V-N steel has been used for high temperature components for power plants.…”

Section: Cr-w-v-nb (Effects Of Creep)mentioning

confidence: 99%

Creep and Fatigue Behavior in Micro-alloyed Steels – A Review

Raj

Goswami

Ray

2014

High Temperature Materials and Processes

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This is a study of microalloyed steels for power plants and reactors. Components operate at coal dust fire temperature or thermal states of reactors, prone to creep during its service. This is to assess remaining life after passage of valuable life by variation in microstructure, e.g. cavity formation. Precipitation at the sub-grain boundaries and grain interior has increased high temperature strength. Coarsening of these appears at the end of life. Variation of heat treatment like spheroidising in place of solutionizing has been responsive to deteriorate performance. Dislocation interplay with precipitate has been acceptable while interaction among dislocations to forest dislocation has been unacceptable. Dislocation assisted nucleation of precipitates of fine size has been found to strengthen steel by thermo-mechanical control process with in greater heating temperature and lower finish rolling temperature. High temperature performance of materials has been assessed by creep, accelerated creep, creep-fatigue and fatigue performances. Increasing temperature for increasing efficiency has correlated the phase transformation of steel. Fatigue performances have been included in creep properties of materials when intermittent shut down-shut up schedules are operated, e.g. peaking power plants.

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Section: Cr-w-v-nb (Effects Of Creep)mentioning

confidence: 99%

Creep and Fatigue Behavior in Micro-alloyed Steels – A Review

Raj

Goswami

Ray

2014

High Temperature Materials and Processes

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“…Dissimilar welds of low-alloy ferritic steels and modified 9 -12% Cr steels are the most important ones. These welds have to be post-weld heat treated (PWHT) immediately after welding in order to anneal the martensite formed along the fusion line and minimize the risk of brittle fracture [1,2]. Particularly interstitials (C, N) are redistributed during the annealing process or in the course of subsequent exploitation.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Stability of Dissimilar Weld Joint of Creep-Resistant Steels with Increased Nitrogen Content at 500 – 900 °C

Zlámal

Foret

Buršı́k³

et al. 2007

DDF

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The structural changes taking place in the dissimilar laboratory welds of 6CrMoV 8-3-2 (T25), being under development, and modified X12CrMoVNb 10-1 (P91) nitrided steels annealed at temperatures of 500 – 900 °C have been subject of study. Carbon and nitrogen redistribution measurement by the EPMA method was complemented with detailed structural analysis aimed at the phase profiles and chemical composition of coexisting carbides and carbonitrides in particular regions of the weld joint. Results of experimental work were compared with thermodynamic and kinetic modeling using the DICTRA software. A very good agreement between the modeling and the experiments was observed.

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On the relaxation of interface stresses during creep of ferritic steel weldments

Kimmins

Smith

1998

The Journal of Strain Analysis for Engineering Design

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This paper examines the interaction between materials joined together that individually have high and low degrees of creep resistance. A specific example considered is an overtempered layer of the heat-affected zone of a ferritic steel weldment which lies between stronger materials. Experimental evidence is reviewed which shows that adjacent strong and weak layers of material creep relatively independently of each other when a tensile stress is applied perpendicular to the plane of the layer. Finite element analyses are presented of a simplified model of a narrow and weak layer of material sandwiched within much stronger material. A constant load is applied perpendicular to the plane of the weak layer and the stress and strain distributions are considered after the accumulation of a significant degree of creep deformation. If the finite element mesh is constructed in a conventional manner it is shown that significant constraint of the narrow, weak layer is to be expected. However, if the mesh is modified so as to allow sliding of adjacent elements then the constraint of the weak zone can be virtually eliminated. It is proposed that finite element models of creeping weld interfaces need to be modified to allow a greater relaxation of the interface stress if they are to agree with experimental studies.

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Experimental and numerical investigations of the creep behaviour of the dissimilar weldment GS‐17 CrMoV 5 11 and X 20 CrMoV 12 1

Cited by 4 publications

References 0 publications

Creep and Fatigue Behavior in Micro-alloyed Steels – A Review

Creep and Fatigue Behavior in Micro-alloyed Steels – A Review

Microstructural Stability of Dissimilar Weld Joint of Creep-Resistant Steels with Increased Nitrogen Content at 500 – 900 °C

On the relaxation of interface stresses during creep of ferritic steel weldments

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