Creep Behaviour of Full Size Welded Joints: Design Improvements

Allais, L.; Dessalas, JP; Forgeron, T.; Fran, D; Huthmann, H.; Escaravage, C.; Poette, C.; Sassoulas, H.

doi:10.1046/j.1460-2695.1998.00295.x

Cited by 4 publications

(7 citation statements)

References 4 publications

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“…The assessment can be based either on the COD or C *. Both methods will be used, considering either the base metal or weld metal creep laws [17 ], and either primary or secondary creep.…”

Section: Comparison Of Defect Assessment Methodsmentioning

confidence: 99%

“…The austenitic welded joint which has been tested was a MMA weld made with electrodes of grade 19Cr 12Ni 2Mo. All details concerning these welds have been already reported in the previous paper [17 ].…”

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

“…Most of the experimental background has been already described in Ref. [17 ], which deals with the creep test without defect. However, it is reminded that the gauge sections were 25 × 100 mm 2 and 25 × 50 mm 2 for, respectively, CEA and IRSID specimens.…”

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

“…This calculation took into account the fact that the gauge length was made of two materials, the parent metal and weld metal. The creep laws of the base metal and weld metal were the ones given in the previous paper [17 ]. The finite element mesh of the structure used six‐node triangles, and was made such that it was possible to follow the axial displacements of points P and R which correspond to points where the two extensometers were fixed on the sample.…”

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

“…Only the CEA, Novatome and IRSID contributions are reported. Results obtained on undefected full‐size weld joints are reported in a companion paper [17 ].…”

Section: Introductionmentioning

confidence: 99%

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Creep Behaviour of Full‐size Welded Joints: Defect Acceptance Criteria

Allais

Dessalas

Forgeron

et al. 1998

Fatigue Fract Eng Mat Struct

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In order to explore the creep crack growth behaviour in welds of real components, creep tests were performed at 600 °C on large specimens made of 316L(N) stainless steel plates. Manual Metal Arc (MMA) welds were investigated. The overall deformation of the specimens, and in many instances the local deformations of the welds, were recorded. The evolutions of the defects were followed by potential drop techniques. The experimental results were compared with two‐dimensional finite element computations, based on the creep behaviour of the base and weld metals, determined with small standard specimens. The time to creep crack growth initiation was correlated with the C* parameter determined from the load–displacement rate. The times to initiation of creep crack growth were compared with evaluations using the RCC‐MR code and R5 rules, as well as other methods, in particular those derived by finite elements analysis

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“…The assessment can be based either on the COD or C *. Both methods will be used, considering either the base metal or weld metal creep laws [17 ], and either primary or secondary creep.…”

Section: Comparison Of Defect Assessment Methodsmentioning

confidence: 99%

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

Section: Materials Tested and Experimental Devicesmentioning

confidence: 99%

“…Only the CEA, Novatome and IRSID contributions are reported. Results obtained on undefected full‐size weld joints are reported in a companion paper [17 ].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Creep Behaviour of Full‐size Welded Joints: Defect Acceptance Criteria

Allais

Dessalas

Forgeron

et al. 1998

Fatigue Fract Eng Mat Struct

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Microstructural creep damage in welded joints of 316L stainless steel

Bouche

Allais

Lezaud

et al. 1998

Materials at High Temperatures

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The present work has been undertaken to study creep damage in welded joints. The complex dual phase microstructure of 316L welds are simulated by manually filling a mould with longitudinally deposited weld beads. Most of the moulded specimens were then aged for 2000 hours at 600°C. High resolution scanning electron microscopy was extensively used to examine the microstructure of the welded material before and after ageing. Columnar grains of austenite constitute a matrix in which thin dendrites of 8-ferrite can be found. The ageing generates the precipitation of carbides, resulting in less transformation in the material. Smooth and notched creep specimens were cut from the mould and tested at 600°C under different stress levels. The creep life of the simulated welded material is shown to be lower than that of the base material. Microstructural observations reveal that creep cavities are preferentially located along the austenite grain boundaries. This analysis of intergranular damage on test specimens is conducted to obtain a predictive damage law which could be used to calculate the lifetime of welded joints.

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Assessment of creep rupture properties for dissimilar steels welded joints between T92 and HR3C

Gong

Cao

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T Dissimilar steels welded joints, between ferritic steel and austenitic stainless steel, are always encountered in high-temperature components in power plants. As two new grade ferritic steel and austenitic stainless steel, T92 (9Cr0.5Mo2WVNb) and HR3C (TP310HCbN), exhibit superior heat strength at elevated temperatures and are increasingly applied in ultra-supercritical (USC) plants around the world, a complete assessment of the properties for T92/HR3C dissimilar steels welded joints is urgently required. In this paper, metallographic microstructures across the joint were inspected by optical microscope. Particularly, the creep rupture test was conducted on joints under different load stresses at 625 • C to analyse creep strength and predict their service lives, while their fractograph were observed under scanning electron microscope. Additionally, finite element method was employed to investigate residual stress distribution of joints. Results showed that the joints were qualified under USC conditions, and T92 base material was commonly the weakest part of them.

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Creep Behaviour of Full Size Welded Joints: Design Improvements

Cited by 4 publications

References 4 publications

Creep Behaviour of Full‐size Welded Joints: Defect Acceptance Criteria

Creep Behaviour of Full‐size Welded Joints: Defect Acceptance Criteria

Microstructural creep damage in welded joints of 316L stainless steel

Assessment of creep rupture properties for dissimilar steels welded joints between T92 and HR3C

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