Comparative Hot Cracking Evaluation Of Welded Joints Of Alloy 690 Using Filler Metals InconelSr 52 And 52 Mss

Yushchenko, K. A.; Savchenko, V. S.; Chervyakov, N. O.; Zvyagintseva, A.V.; Guyot, E.

doi:10.1007/bf03321317

Cited by 20 publications

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“…The metallographic examinations of this work confirmed that the hot cracking susceptibility of the 52MSS overlay was higher than that of the 52M overlay [34,35]. Table 2 lists the solidus and liquidus temperatures of different samples determined by DSC.…”

Section: Discussionsupporting

confidence: 61%

“…Adding Nb and Ti into IN52 alloy can reduce its DDC susceptibility due to the precipitation of NbC and TiC at the GBs [30]. It was reported that the DDC of a 52MSS weld, which was modified from 52M by adding 2.5% Nb and 3.0% Mo, can be alleviated even after multi-pass welding [34,35].In this study, IN52M and IN52MSS fillers were employed to perform overlay-welding on CF8A SS substrate. The microstructures and chemical compositions of the microconstituents at the solidified boundaries of the overlay welds were investigated.…”

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The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds

Chen

et al. 2019

Metals

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Overlay-welding of IN52M and IN52MSS onto CF8A stainless steel (SS) was conducted by a gas tungsten arc welding process in multiple passes. An electron probe micro-analyzer (EPMA) was applied to determine the distributions and chemical compositions of the grain boundary microconstituents, and the structures were identified by electron backscatter diffraction (EBSD). The hot cracking of the overlay welds was related to the microconstituents at the interdendritic boundaries. The formation of γ-intermetallic (Ni 3 (Nb,Mo)) eutectics was responsible predominantly for the hot cracking of the 52M and 52MSS overlays. The greater Nb and Mo contents in the 52MSS overlay enhanced the formation of coarser microconstituents in greater amounts at the interdendritic boundaries. Thus, the hot cracking sensitivity of the 52MSS overlay was higher than that of the 52M overlay. Moreover, migrated grain boundaries were observed in the 52M and 52MSS overlays but did not induce ductility dip cracking (DDC) in this study. amount of interdendritic phases [25]. Coarse (Nb,Ti)C precipitates in 52M overlays will enhance the formation of Laves phases and increase their size [25,26], leading to increased hot crack sensitivity of the overlay welds.Besides the occurrence of hot cracking, Ni-based deposits for repair-welding of nuclear reactor components can be susceptible to ductility dip cracking (DDC) [27][28][29]. DDC in a Ni-based alloy weld mainly occurs in the reheated weld at elevated temperatures, and it is related to grain boundary (GB) sliding, impurity segregation at GBs, and intergranular precipitation [30]. GB sliding is responsible for the DDC of 52M deposits in strain-to-fracture tests [31]. Moreover, ductility dip cracks are initiated due to the combined effects of the strain concentration on the concave side of the grain boundary, the orientation of the GB to the loading direction, and GB disorientation [32]. In a prior study, IN52 alloy is reported to be more susceptible to DDC than IN82 alloy [33]. Adding Nb and Ti into IN52 alloy can reduce its DDC susceptibility due to the precipitation of NbC and TiC at the GBs [30]. It was reported that the DDC of a 52MSS weld, which was modified from 52M by adding 2.5% Nb and 3.0% Mo, can be alleviated even after multi-pass welding [34,35].In this study, IN52M and IN52MSS fillers were employed to perform overlay-welding on CF8A SS substrate. The microstructures and chemical compositions of the microconstituents at the solidified boundaries of the overlay welds were investigated. The hot cracking tendency and DDC of 52M and 52MSS overlays were evaluated by inspecting the interior microfissures carefully. Grain boundary micro-constituents were analyzed by electron backscatter diffraction (EBSD) to identify the complex phases. Furthermore, the relationships between microstructural features and the cracking tendencies of the overlay welds were correlated with those interdendritic precipitates.

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Section: Discussionsupporting

confidence: 61%

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The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds

Chen

et al. 2019

Metals

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“…5 Schematic illustration of the Trans-Varestraint test using a high-speed camera and two-color pyrometry this type of material, it is difficult to ascertain what the true value is. However, it has been reported that the value for another type of Ni base alloy is approximately 0.1 to 0.4% [8]. In addition, since it is not possible to measure the augmented strain using the conventional method, the method using a high-speed camera and two-color pyrometry is considered to be more accurate.…”

Section: Minimum Strain For Crack Initiationmentioning

confidence: 99%

Determining the BTR by conducting a Trans-Varestraint test using a high-speed camera and two-color pyrometry

et al. 2018

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The Ni-Fe alloy consumable that applies to the welding of 9% nickel steel for LNG storage tanks is highly susceptible to solidification cracks. To evaluate susceptibilities such as the brittleness temperature range (BTR), a Trans-Varestraint test is generally conducted. However, it is difficult to evaluate the minimum strain value for the BTR and the real temperature at both ends of a solidification crack in a conventional Trans-Varestraint test because these values are measured indirectly. In this study, we propose determining the temperature range by conducting in-situ observations during a Trans-Varestraint test using a highspeed camera and two-color pyrometry so that the temperature range can be measured directly from the temperatures at both ends of the crack. Furthermore, we measured the augmented strain from the time elapsed since the initiation of bending. This method allowed us to successfully measure the augmented strain and the temperature range in the Trans-Varestraint test and to determine the BTR more accurately.

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“…Known is the high sensitivity to formation of ductility dip cracks (DDC) in welded joints of nickel alloys of Inconel 690 type, when cracks form in the temperature range of about 700-1000 °C along high-angle migration boundaries of austenite grains predominantly in multipass welds [2][3][4]. Mechanical testing in Ala-Too unit (Greeble type) showed differences in susceptibility to ductility dip formation.…”

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Microstructural features of multilayer welds with different hot cracking sensitivity

Yushchenko¹,

Markashova²,

Zvyagintseva³

et al. 2016

The Paton Welding J.

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The work deals with multilayer welds made with Inconel 52 wire, which have a high sensitivity to formation of hot ductility dip cracks in the heat-affected zone, and welds made with 52MSS wire, which turned out to be insensitive to formation of this type of cracks at a certain level of strain rates. Changes of structural characteristics of welds made with the above wires were studied by the methods of transmission microscopy, X-ray microprobe analysis, microhardness measurement, as well as electron backscatter diffraction. 9 Ref., 2 Tables, 8 Figures.

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Comparative Hot Cracking Evaluation Of Welded Joints Of Alloy 690 Using Filler Metals InconelSr 52 And 52 Mss

Cited by 20 publications

References 2 publications

The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds

The Comparison of Cracking Susceptibility of IN52M and IN52MSS Overlay Welds

Determining the BTR by conducting a Trans-Varestraint test using a high-speed camera and two-color pyrometry

Microstructural features of multilayer welds with different hot cracking sensitivity

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