Diffusion brazing of stainless steels influence of Ni-B filler alloy composition

Ivannikov, A. A.; Penyaz, Milena; Джумаев, П. С.; Bachurina, Diana; Sevriukov, O.N

doi:10.1007/s40194-020-01013-y

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…The DZ is the transition zone between the material that was influenced by the brazing process and the adjoining base material. The fine chromium borides (CrB) on the grain boundaries highlighted with number 1 in Figure 9 are the main identifier of this zone [12,30]. The analyses of the cross-sections show that the final microstructure depends on the time of isothermal solidification and the elemental composition of the filler metal.…”

Section: Alloying and Holding-time-dependent Microstructure Formationmentioning

confidence: 99%

“…The microstructure can be adjusted by the filler metal alloy compositions and the manufacturing parameters used. For nickel-based alloys, which usually contain boron and silicon to reduce the melting temperature [12], the formation of borides and silicides can result in significantly reduced mechanical properties depending on their size and localization [13].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Otto

Penyaz

Möhring

et al. 2021

Metals

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The knowledge of alloy–process–structure–property relationships is of particular interest for several safety-critical brazed components and requires a detailed characterization. Thus, three different nickel-based brazing filler metals were produced with varying chromium and molybdenum content and were used to braze butt joints of the austenitic stainless steel AISI 304L under vacuum. Two holding times were used to evaluate diffusion-related differences, resulting in six specimen variations. Significant microstructural changes due to the formation and location of borides and silicides were demonstrated. Using X-ray diffraction, alloy-dependent residual stress gradients from the brazing seam to the base material were determined and the thermal-induced residual stresses were shown through simulations. For mechanical characterization, impact tests were carried out to determine the impact toughness, as well as tensile tests at low and high strain rates to evaluate the strain-rate-dependent tensile strength of the brazed joints. Further thermal, electrical, and magnetic measurements enabled an understanding of the deformation mechanisms. The negative influence of brittle phases in the seam center could be quantified and showed the most significant effects under impact loading. Fractographic investigations subsequently enabled an enhanced understanding of the fracture mechanisms.

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Section: Alloying and Holding-time-dependent Microstructure Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Otto

Penyaz

Möhring

et al. 2021

Metals

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Effects of Cu Coating Addition on Mechanical Properties of Vacuum Brazed Joints

Wang,

Li,

Wei

et al. 2024

steel research int.

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In this study, a copper brazing filler metal coating is fabricated on a 304 stainless steel (304SS) substrate using an electroplating technique. The effect of using electroplated copper brazing filler metal coatings compared to pure copper foil of the same thickness for vacuum brazing of stainless steel joints is investigated. The microstructure and microhardness of the brazed joints are characterized using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and a Vickers hardness tester. The shear strength of the brazed joints is measured using an INSTRON 5869 universal testing machine. The results indicate that the electroplated Cu coating is dense, predominantly with a single cubic phase, with a few copper particles aggregating on the surface. Under electroplating conditions of 20 mA cm−2 for 1 h, the coating thickness was 56 μm. The shear strength of the brazed joint with this coating reached a maximum of 333.7 MPa, which is higher than that of a brazed joint with a 60 μm thick copper foil, which exhibits a shear strength of 303.2 MPa. The shear strength of the brazed joints shows an initial increase followed by a decrease as current density and electroplating time increase. This study provides significant technical support for brazing complex shapes or precision components. It suggests a method to simplify the brazing process, reduce production costs, and enhance the strength of brazed joints.

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Microstructure of conventional/PBF-LB/M 316L stainless steel hybrid joints brazed with nickel-based brazing alloys

Tillmann,

Bültena,

Wojarski

et al. 2023

Weld World

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Due to the additive manufacturing principle, laser-melted materials (PBF-LB/M) such as the austenitic chromium-nickel steel 316L have a different microstructure compared to materials produced by conventional continuous casting. The PBF-LB/M-produced 316L has a thermally metastable, anisotropic microstructure with epitaxially grown grains in which a cellular substructure is located. When brazing hybrid joints from the conventional and additive manufacturing routes with nickel-based brazing alloys, different diffusion mechanisms occur simultaneously in both joining partners. This occurs due to the different microstructural characteristics of the parent materials. The altered diffusion mechanisms lead to a new distinct microstructure in the joining zone, which influences the achievable quality of the brazed joint in a previously unknown way.

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Diffusion brazing of stainless steels influence of Ni-B filler alloy composition

Cited by 5 publications

References 16 publications

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Effects of Cu Coating Addition on Mechanical Properties of Vacuum Brazed Joints

Microstructure of conventional/PBF-LB/M 316L stainless steel hybrid joints brazed with nickel-based brazing alloys

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