Review of candidate welding processes of RAFM steels for ITER test blanket modules and DEMO

Aubert, P.; Tavassoli, F.; Rieth, M.; Diegele, E.; Poitevin, Y.

doi:10.1016/j.jnucmat.2010.12.248

Cited by 74 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since high hardness would degrade toughness and creep resistance of the weld structure, PWHT is needed to restore properties of base material. [17] B. Post Weld Heat Treatment…”

Section: Resultsmentioning

confidence: 99%

“…EUROFER steels were designed for the manufacturing of European breeding reactor blankets. [17] The experimental RAFM has a similar composition to F82H steel originally developed by Japan Atomic Energy Research Institute (JAERI) and JFE Corporation for application in the back wall of nuclear reactors. [31,32] The welding parameters are listed in Table I.…”

Section: Methodsmentioning

confidence: 99%

“…[7,[17][18][19][20][21][22] While considered to have relatively good weldability, RAFM steels can suffer from welding-induced property degradations caused by phase transformation. [17,22] TIG and EB welding of RAFM F82H (developed in Japan) led to a highly inhomogeneous microstructure in the weld. [22,23] It consisted of several distinctive regions including the fusion zone (FZ), with cast-like microstructures, a coarse-grained heat-affected zone (CG-HAZ), a finegrained HAZ (FG-HAZ), and an over-tempered HAZ (OT-HAZ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Friction Stir Welding of ODS and RAFM Steels

Zhao

Hoelzer

et al. 2015

Metallurgical and Materials Transactions E

View full text Add to dashboard Cite

Advanced structural materials such as oxide dispersion strengthened steels and reduced-activation ferritic/martensitic steels are desired in fusion reactors as primary candidate materials for first wall and blanket structures, due to their excellent radiation and high-temperature creep resistance. However, their poor fusion weldability has been the major technical challenge limiting practical applications. For this reason, solid-state friction stir welding (FSW) has been considered for such applications. In this work, the effect of FSW parameters on joining similar and dissimilar advanced structural steels was investigated. Scanning electron microscopy and electron backscatter diffraction methods were used to reveal the effects of FSW on grain size, micro-texture distribution, and phase stability. Hardness mapping was performed to evaluate mechanical properties. Post weld heat treatment was also performed to tailor the microstructure in the welds in order to match the weld zone mechanical properties to the base material.

show abstract

“…Since high hardness would degrade toughness and creep resistance of the weld structure, PWHT is needed to restore properties of base material. [17] B. Post Weld Heat Treatment…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Friction Stir Welding of ODS and RAFM Steels

Zhao

Hoelzer

et al. 2015

Metallurgical and Materials Transactions E

View full text Add to dashboard Cite

show abstract

“…This allows the shallow land burial of reactor components after their service life times are exhausted. The fabrication of this steel for fusion reactor is primarily by welding [13,14], and hence A-TIG welding of RAFM steel can be considered as an emerging field for study. However limited literatures are available on A-TIG welding of RAFM steels.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Effects of Carrier Solvent and Oxide Fluxes in Activated TIG Welding of Reduced Activation Ferritic/Martensitic Steel

2016

IJAMAE

View full text Add to dashboard Cite

Abstract-This work attempts to investigate the effect of oxide fluxes on 6mm thick Reduced Activation ferritic/martensitic steels (RAFM) during Activated TIG (A-TIG) welding. Six different fluxes Al 2 O 3 , Co 3 O 4 , CuO, HgO, MoO 3 , and NiO were mixed with methanol for conversion into paste and bead-on-plate experiments were then carried out. This study, systematically investigates the influence of oxide-based flux powder and carrier solvent composition on the weld bead shape, geometric shape of weld bead and dominant depth enhancing mechanism in tungsten inert gas (TIG) welding of reduced activation ferritic/martensitic (RAFM) steel. It was inferred from the study that flux Co 3 O 4 and MoO 3 imparted full and secure (more than 6mm) penetration with methanol owing to dual mechanism of reversed Marangoni and arc constriction. The use of methanol imparted good spreadabilty and coverability and ultimately higher peak temperatures were observed with its use owing to stronger depth enhancing mechanisms than use of acetone with same oxide fluxes and welding conditions.

show abstract

“…[15] Since welding is an inevitable fabrication process, study on structural and mechanical properties of the welded joints of 9Cr-RAFM steels is considered as a thrust area of research. [16][17][18][19] For fabrication of TBM components, fusion welding techniques like electron beam welding, tungsten inert gas (TIG) welding, and laser beam welding are chosen where the extent of heat-affected zone (HAZ) is minimum compared to other conventional methods. [20] However, in fusion welding, the weldment would possess a highly heterogeneous microstructure depending on the distance of a region from the heat source and number of passes employed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Alloy Content and Prior Microstructure on Evolution of Secondary Phases in Weldments of 9Cr-Reduced Activation Ferritic-Martensitic Steel

Paul

Sudha

Saroja

2015

Metall Mater Trans A

View full text Add to dashboard Cite

9Cr-Reduced Activation Ferritic-Martensitic steels with 1 and 1.4 wt pct tungsten are materials of choice for the test blanket module in fusion reactors. The steels possess a tempered martensite microstructure with a decoration of inter-and intra-lath carbides, which undergoes extensive modification on application of heat. The change in substructure and precipitation behavior on welding and subsequent thermal exposure has been studied using both experimental and computational techniques. Changes i.e., formation of various phases, their volume fraction, size, and morphology in different regions of the weldment due to prolonged thermal exposure was influenced not only by the time and temperature of exposure but also the prior microstructure. Laves phase of type Fe 2 W was formed in the high tungsten steel, on aging the weldment at 823 K (550°C). It formed in the fine-grained heat-affected zone (HAZ) at much shorter durations than in the base metal. The accelerated kinetics has been understood in terms of enhanced precipitation of carbides at lath/grain boundaries during aging and the concomitant depletion of carbon and chromium and enrichment of tungsten in the vicinity of the carbides. Therefore, the fine-grained HAZ in the weldment was identified as a region susceptible for failure during service.

show abstract

Review of candidate welding processes of RAFM steels for ITER test blanket modules and DEMO

Cited by 74 publications

References 13 publications

Friction Stir Welding of ODS and RAFM Steels

Friction Stir Welding of ODS and RAFM Steels

Experimental Investigation on Effects of Carrier Solvent and Oxide Fluxes in Activated TIG Welding of Reduced Activation Ferritic/Martensitic Steel

Influence of Alloy Content and Prior Microstructure on Evolution of Secondary Phases in Weldments of 9Cr-Reduced Activation Ferritic-Martensitic Steel

Contact Info

Product

Resources

About