Fabrication and modeling of ultra-hard and high-strength B4C-based laminated ceramics by brazing joining

Vacuum brazing is a black box process, so component distortion that occurs during the heat treatment is difficult to prove experimentally. Thus, a novel FE-model was developed in ANSYS Workbench to calculate the time and location resolved component deformation of AISI 316L/B-Ni2 brazing assemblies. In this regard, a new method of radiation and contact modeling was developed that enabled a significant reduction of the calculation times and solved the convergence issue for simulating the distortion of large-scale, thin components. The results showed that the component deformation during heating can be easily kept in the elastic range and can be almost completely eliminated by using a geometry-dependent soaking time. In contrast to this, high cooling rates were found to result in thermally induced stresses well above the elastic yield limit, causing significant component deformation. With further cooling, the deformation decreases significantly, but it depends on the initial stress state, the geometry, and the cooling rate whether the deformation can be completely leveled out during the shrinkage of the component. Thus, the initially high cooling rates were identified to be responsible for the final distortion. Furthermore, this was highly affected by the local position in the heating chamber. The simulation results were used to design a fixture for vertical positioning, which reduced the max. temperature difference in the brazing assembly from 141 to 79 °C, the max. interim distortion from 275 to 31 µm, and the final distortion from 14 to 8 µm.

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Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Tillmann

Henning

Wojarski

et al. 2023

Int J Adv Manuf Technol

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Protection mechanism of B4C–TiB2–SiC composite ceramic under ultra-high velocity impact

Ming,

Song,

Cheng

et al. 2024

Ceramics International

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Profiling interfacial reaction features and mechanical properties of B4C ceramic and Ti6Al4V titanium alloy brazed with Ag-based brazing filler

Chen,

Li,

et al. 2024

Journal of Materials Processing Technology

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Fabrication and modeling of ultra-hard and high-strength B4C-based laminated ceramics by brazing joining

Cited by 5 publications

References 26 publications

Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Protection mechanism of B4C–TiB2–SiC composite ceramic under ultra-high velocity impact

Profiling interfacial reaction features and mechanical properties of B4C ceramic and Ti6Al4V titanium alloy brazed with Ag-based brazing filler

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