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

Ye, Y.; Zou, Guisheng; Long, W.; Jia, Qiang; Bai, Hailin; Wu, Aiping; Ping, Li

doi:10.1080/13621718.2018.1477546

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…The solid solution sample has the lowest tensile strength and the best plastic toughness. High‐density equiaxed dimples are evenly distributed on the low‐break fractures, and the massive carbides are distributed at the bottom of some dimples . The fracture morphologies of T 1 –T 4 are consistent at room temperature.…”

Section: Resultsmentioning

confidence: 80%

“…High-density equiaxed dimples are evenly distributed on the low-break fractures, and the massive carbides are distributed at the bottom of some dimples. [26,27] The fracture morphologies of T 1 -T 4 are consistent at room temperature. As shown in Figure 6b-e, the fracture exhibits the characteristics of an intergranular fracture at low magnification where there are a large number of small dimples distributed on the fracture surface at high magnification.…”

Section: Fracture Analysismentioning

confidence: 88%

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Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

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The influences of the size and shape of the γ 0 phase and the type and distribution of carbides on the fracture behavior of a new Ni-Cr-Fe superalloy subjected to four different solution aging treatments are examined. The γ 0 phase and γ matrix of the L1 2-ordered structure maintain a coherent orientation relationship on the {100} and {110} atomic planes according to transmission electron microscopy observations. The material becomes stronger because the movement of dislocations is hindered by the γ 0 phase and MC (Nb-rich, Ti-rich) and M 23 C 6 (Cr-rich, Mo-rich) carbides. The two-stage aging system (850 C Â 4 h þ 730 C Â 4 h) substantially increases the size of the γ 0 phase. The solid solution sample shows a microporous-aggregated ductile fracture, and the solution-aged samples show a microporous-aggregated crystalline fracture according to scanning electron microscopy observations. The fracture mechanism is also discussed.

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Section: Resultsmentioning

confidence: 80%

Section: Fracture Analysismentioning

confidence: 88%

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

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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%

“…Because of its versatility, BNi-9 (MBF 80, Nicobraz 150) has been extensively studied in base Ni alloys, base Co alloys and stainless steel. This filler material can be applied as either a foil or paste, each one having a specific application; an amorphous foil provides more uniform joints assemblies [1], and powders mixed with a binder and paste are used to repair cracks and wear defects [2][3][4][5][6][7]. In Table 1, the experimental conditions of some of these studies have been summarized.…”

Section: Introductionmentioning

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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“…For different types of damages, the corresponding repairing methods are different. For the damaged blade with surface cracks, conventional brazing [5,6] and wide gap braze [7][8][9] are recommended. These methods have the advantages of no jigging, no pressure required, and batch processability.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal undercooling and thermal cycles on the grain and microstructure evolution of TC17 titanium alloy repaired by wire arc additive manufacturing

Zhuo

Yang

Fan

et al. 2022

Int J Adv Manuf Technol

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Wire arc additive manufacturing (WAAM) can be used to repair blades or blisk made of titanium alloy with the advantage of high e ciency and low-cost. In this work, the nite element model of repairing the blade based on the arc heat source was established to investigate it. Results showed that the maximum effect of thermal undercooling appears when the peak current transforms to the base current (1Hz or 5Hz), which will promote the grains re nement with the combination of su cient constitutional supercooling. Compared to the single-layer deposition, the microstructure in the near-heat affected zone (near-HAZ) of multi-layer deposition changes from the metastable β phases to the extremely ne α phases, which was caused by the repeated thermal cycles.

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

Cited by 14 publications

References 32 publications

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

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

Effects of thermal undercooling and thermal cycles on the grain and microstructure evolution of TC17 titanium alloy repaired by wire arc additive manufacturing

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