Microstructure of diffusion-brazing repaired IN738LC superalloy with uneven surface defect gap width

Ye, Y.; Jin, Wei; Zou, Guisheng; Long, W.; Bai, Hailin; Wu, Aiping; Ping, Li

doi:10.1080/13621718.2017.1290338

Cited by 11 publications

(4 citation statements)

References 37 publications

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“…In order of 1150°C–18 h, HT-A and HT-B, the content of Ni and Co in ISZ decreased, while the Cr and Ti showed the opposite distribution. The chemical compositions gradually came close to that of base metal (listed in Table 1) due to the inter-diffusion of elements between filler metal and the base metal [34]. Table 3 shows that the chemical composition of the ISZ heat treated with HT-B was nearly the same as that of base metal.…”

Section: Resultsmentioning

confidence: 84%

Diffusion brazing repair of IN738 superalloy with crack-like defect: microstructure and tensile properties at high temperatures

Zou

Long³

et al. 2019

Science and Technology of Welding and Joining

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In this study, tapered slots with an opening width about 200 μm were artificially fabricated in IN738LC superalloy to imitate service cracks. The 'cracks' were repaired by diffusion brazing with a Ni-Cr-Co-Al-Ta-B filler alloy at 1150°C and then heat treated at 1180°C (HT-A) and 1190°C (HT-B), respectively. A joint with uniform microstructure, chemical composition and hardness was obtained using HT-B. The mechanisms of the borides evolution during homogenisation were discussed. The tensile strength of the HT-B joint tested at 20, 600 and 800°C reached up to approximately 96, 90 and 87% of the base metal, respectively. The fracture modes of the joints tensile tested at various temperatures were discussed.

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Section: Resultsmentioning

confidence: 84%

Diffusion brazing repair of IN738 superalloy with crack-like defect: microstructure and tensile properties at high temperatures

Zou

Long³

et al. 2019

Science and Technology of Welding and Joining

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“…They incorporated a metal powder onto a filler paste to improve the brazing treatment. Ye et al [7,34] studied the repair of simulated cracks in IN738LC with BNi-1 paste and mixed filler alloy. They found an isothermal solidified gap of approximately 1000 µm with a six-hour treatment.…”

Section: Base Alloy Alloys Filler Metal Thickness Brazing Microstrucmentioning

confidence: 99%

Metallurgical Interaction among BNi-9 and Waspaloy, FSX-414 or 304-Type Stainless Steel under TLP Cycle

Flores-Escareño

Castro‐Román

Hernández-García³

et al. 2020

Metals

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The metallurgical interaction of BNi-9 filler metal paste with Waspaloy, Ni-coated Waspaloy, FSX-414, and 304-SS is studied in a brazing treatment under an argon atmosphere with an isothermal hold for one hour at 1150 °C. The Waspaloy alloys were brazed under both solubilized and aging conditions. Before brazing, some Waspaloy samples were electrochemically coated with an Ni layer 35-40 μm thick. The microstructures of the FSX-414 and 304-SS alloys showed that the thickness of the isothermal solidification zones was approximately 50 μm, while this thickness was not well defined in the Waspaloy samples. The Ni-coated solubilized Waspaloy showed a wider diffusive zone, which was associated with an increase in the penetration extension of the liquid films. The analysis of grain orientation in all brazed zones of the Waspaloy samples showed aleatory characteristics. Plastic factors in the different brazed zones were also obtained by nanoindentation under 350 mN loads. It was observed that the plastic factor was low when the width of the diffusive zone increased. The plastic factor in the Ni-coated Waspaloy was the lowest, while the diffusive zone in this sample had the largest width. The BNi-9 wettability is better in FSX-414, and 304-SS than in Waspaloy. Ni coating in Waspaloy improves BNi-9 wettability.

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“…Induced compositional changes by interdiffusion between the base metal and filler metal during holding at a constant bonding temperature are the driving force for isothermal solidification. Athermal Solidification Zone (ASZ): This zone is formed during cooling of the residual liquid at the joint centreline via a eutectic transformation reaction, which is a characteristic of the Ni-based/boron-bearing FM systems. The microstructure of this zone composes eutectic-type solidification reaction products consisting of hard and brittle borides intermetallic compounds [9-14]. Diffusion -Affected Zone (DAZ): The microstructure of this zone is influenced by B diffusion into the base superalloy and low solubility of B in Ni-based superalloys which lead to in situ precipitation of borides in the substrate region [15-20].…”

Section: Introductionmentioning

confidence: 99%

“…Athermal Solidification Zone (ASZ): This zone is formed during cooling of the residual liquid at the joint centreline via a eutectic transformation reaction, which is a characteristic of the Ni-based/boron-bearing FM systems. The microstructure of this zone composes eutectic-type solidification reaction products consisting of hard and brittle borides intermetallic compounds [9-14].…”

Section: Introductionmentioning

confidence: 99%

Intermetallic phase formation during brazing of a nickel alloy using a Ni–Cr–Si–Fe–B quinary filler alloy

Ghasemi

Pouranvari

2019

Science and Technology of Welding and Joining

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Fundamental understanding of the intermetallic phase formation is the key for enhancing the robustness and reliability of the brazed joints. The paper addresses the phase transformations during brazing of the Hastelloy X nickel-base superalloy using the quinary Ni-13Cr-4.5Si-4.2Fe-2.8B (wt-%) braze alloy. The mechanisms of intermetallic formation via solidification and solid-state precipitation are discussed. The athermal solidification zone (ASZ) is featured by the formation of brittle and hard borides and boro-silicides that are formed via eutectic reactions. However, in contrast to other commercial B-bearing Ni-based filler alloys, it was identified that the presence of a high-volume fraction of eutectic gamma solid solution between boride phases within the joint centreline can alleviate the deleterious effect of the intermetallic phases on the joint toughness.

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Microstructure of diffusion-brazing repaired IN738LC superalloy with uneven surface defect gap width

Cited by 11 publications

References 37 publications

Diffusion brazing repair of IN738 superalloy with crack-like defect: microstructure and tensile properties at high temperatures

Diffusion brazing repair of IN738 superalloy with crack-like defect: microstructure and tensile properties at high temperatures

Metallurgical Interaction among BNi-9 and Waspaloy, FSX-414 or 304-Type Stainless Steel under TLP Cycle

Intermetallic phase formation during brazing of a nickel alloy using a Ni–Cr–Si–Fe–B quinary filler alloy

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