Investigation of effect of post weld heat treatment conditions on residual stress for ITER blanket shield blocks

Jung, Huicheul; Kim, Sa-Woong; Lee, Yun-Hee; Baek, Seung-Wook; Ha, Min-Su; Shim, Hee-Jin

doi:10.1016/j.fusengdes.2016.02.007

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…When the stress state tended to be an equi-biaxial state, k = 1, while for the uniaxial stress state, k = 0. According to previously published literature [18,27,28], the residual stress present in welded joints is biaxial, and k = 0.33. Although the methods proposed by Suresh et al [12] and Lee et al [15] are the most common methods using instrumented indentation to measure the residual stress of materials, these aforementioned methods depend on the accuracy of indentation contact area [17].…”

Section: Experimental and Methodologymentioning

confidence: 99%

Revisiting the procedure for characterising mechanical properties in welded joints through nanoindentation

Chang

Xiao

Liu

et al. 2019

Materials Science and Technology

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Owing to the microstructural inhomogeneities and residual stresses that are generated during welding, welded joints are the weakest parts of structures. Nanoindentation, a non-destructive technique, is commonly used to analyse the local mechanical properties and residual stresses in welded joints. However, the pile-up effect is often neglected during the nanoindentation procedure, which results in inaccurate measurements. In this study, an alternative procedure, based on a previous study, was used to measure the local mechanical properties and residual stresses in metal inert gas (MIG) welded joints. Moreover, a new equation is proposed for estimating the residual stresses.

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Section: Experimental and Methodologymentioning

confidence: 99%

Revisiting the procedure for characterising mechanical properties in welded joints through nanoindentation

Chang

Xiao

Liu

et al. 2019

Materials Science and Technology

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“…The allocation of ITER SB to KODA is 49.8%, and the procurement is to be delivered around before the first plasma, 2025 (see Figure 10). Reports on ITER SB were presented for the manufacturing and testing of a full-scale prototype, 18 the effect of postweld heat treatment conditions on residual stress, 19 comparative evaluation of structural integrity, 20 dimensional stability verification after stress relieving, 21 and experimental and numerical study on pressure drop. 22 The material of SB is stainless steel 316L(N)-IG; and the size is about 1.5 × 1.0 × 0.5 m, weight is about 2.6 MT, and the required number is 440 modules.…”

Section: Blanket Sbmentioning

confidence: 99%

Fusion energy development status in Korea

et al. 2017

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SummaryThis overview discusses the status of fusion energy development in the Republic of Korea. Korea studies fusion energy through research and development in 2 ways: one by performing the Korea Superconducting Tokamak Advanced Research (KSTAR) for a domestic approach and the other by participating in the international collaboration project ITER. Korea had remarkable progresses not only in KSTAR but also in the ITER project in 2016. In KSTAR, a world record of more than 70 seconds in high-performance plasma (H-mode) operation in the superconducting tokamak has been achieved. For the ITER project, toroidal field conductors have been successfully accomplished and the other major equipment such as vacuum vessel sectors, ports, and assembly tooling seem to be reaching an end. This paper deals with current research and development results on both fields of KSTAR study and ITER project progress.

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“…Several researchers have proven that tempering performed between 500–650 °C could relieve residual tensile stress for general steel [ 12 , 13 ]. Residual stress and hardness were decreased by increasing the heat-treatment temperature and holding time [ 14 , 15 , 16 ]. An annealing temperature that is too high for pipeline steel can affect the microstructure of the welded joint, while residual stress cannot be effectively reduced at a temperature that is too low [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

Wang

Dai³

et al. 2022

Materials

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In the current study, post-weld heat treatment (PWHT 580 °C) was used for an X80 pipeline steel-welded joint, and the fracture toughness of the welded joint was investigated using a crack tip opening displacement (CTOD) test. The relationship between microstructure evolution and fracture toughness is also discussed in this study. The results showed that the weld center mainly consisted of acicular ferrite (AF). The subcritical heat-affected zone (SCHAZ) consisted of a large amount of fine polygonal ferrite and some AF, and it maintained the rolling state of the base metal. The microstructure of the coarse-grained heat-affected zone (CGHAZ) was composed of granular bainite (GB) and M/A constituents, the latter of which decreased after the PWHT. The CTOD values of the weld center were in the range of 0.18–0.27 mm, while those of the CGHAZ were in the range of 0.02–0.65 mm. A brittle fracture occurred in the CGHAZ for both the as-welded and PWHT samples; the CTOD values were 0.042 mm and 0.026 mm, respectively. The CTOD values of the SCHAZ’s location were in the range of 0.8–0.9 mm. The PWHT did not deteriorate the microstructure of the CGHAZ and had little influence on the fracture toughness of the X80 pipeline steel-welded joint; it ensured the fracture toughness of the welded joints and reduced the welding residual stress.

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Investigation of effect of post weld heat treatment conditions on residual stress for ITER blanket shield blocks

Cited by 5 publications

References 9 publications

Revisiting the procedure for characterising mechanical properties in welded joints through nanoindentation

Revisiting the procedure for characterising mechanical properties in welded joints through nanoindentation

Fusion energy development status in Korea

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

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