The Selection of Appropriate Process Parameters of Diffusion Bonding in Heterogeneous Weld of 355J2/AISI 316L Steels

Moravec, Jaromír; Nováková, Iva

doi:10.4028/www.scientific.net/kem.737.101

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…Reduced elongation‐at‐fracture values and varying tensile strengths indicate that the bonding parameters influence the mechanical properties of the bonds. [ 20,23 ]…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of the Influence of the Bonding Temperature and Contact Pressure Regimes during Diffusion Bonding on the Deformation and Mechanical Properties of AISI 304

Gietzelt¹,

Walter

Toth³

et al. 2021

Adv Eng Mater

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Process parameters for diffusion bonding are temperature, dwell time, and contact pressure. Temperature and contact pressure have opposite effects on deformation. The effect of temperature on deformation was investigated in steps of 20 K from 1015 to 1135 °C. Contact pressure and dwell time were 16 MPa and 4 h, respectively. The deformation increase steadily with temperature. Yield strength and tensile strength decrease slightly with temperature, which is attributed to grain growth. The elongation‐at‐fracture values are 100–105%. For 925 to 995 °C, values for elongation at fracture decrease. It was investigated if comparable mechanical properties can be obtained at a temperature of 850 °C only. Experiments with higher constant contact pressures were supplemented by tests with superimposed short load peaks. Similar and higher values for the yield strength were achieved. A correlation of yield strength, tensile strengths and elongation‐at‐fracture values with contact pressure and contact pressure regime was found. The values for elongation at fracture are significantly lower than those for higher temperatures. This even applies to parameter sets at different temperatures, leading to almost identical deformations. Reduced elongation‐at‐fracture values at 850 °C are attributed to microscopically small defects in the bonding plane and to notch effects.

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“…Reduced elongation‐at‐fracture values and varying tensile strengths indicate that the bonding parameters influence the mechanical properties of the bonds. [ 20,23 ]…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of the Influence of the Bonding Temperature and Contact Pressure Regimes during Diffusion Bonding on the Deformation and Mechanical Properties of AISI 304

Gietzelt¹,

Walter

Toth³

et al. 2021

Adv Eng Mater

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show abstract

“…Surprisingly, there is not too much literature facing deformation on the microscopic and macroscopic scale during diffusion bonding [3][4][5]. Moravec et al give a set of parameters including the deformation using a thermomechanical simulator Gleeble 3500-device (Poestenkill, NY, USA) [6]. The experiments were performed on specimens by applying a temperature profile along the axis in which the force was acting.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of the Deformation Behavior during Diffusion Bonding of 1.4301 (AISI 304) as a Function of Material Width and Aspect Ratio

Gietzelt¹,

Toth²,

Kraut³

et al. 2020

Metals

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In this paper, the impact of material width as well as aspect ratio on deformation during diffusion bonding of layered samples were investigated. For this, six annular samples with a constant cross-sectional area but an increasing diameter and thus decreasing material width were designed. In a first set of experiments, specimens of a constant height of h = 20 mm were examined. Each sample consisted of 10 sheets, 2 mm in thickness each. Diffusion bonding was performed at T = 1075 °C, t = 4 h and p = 15 MPa. Subsequently, additional samples with a constant aspect ratio of about three but different material width were diffusion bonded. For this, additional layers were added. It was expected that the deformation should be nearly constant for a constant aspect ratio. However, comparing the deformation to a sample possessing an aspect ratio of about three from the first batch, a much higher deformation was obtained now. Bonding a third sample, a deformation in the same range as for the other two samples of the second batch was obtained. It was found that due to the evaporation of metals, the thermocouples were subjected to aging, which was proven indirectly by the evaluation of heating power. Since the diffusion coefficient of the metals follows an exponential law, deformation changes considerably with temperature. This emphasizes that exact temperature measurement is very important, especially for bonding microprocessor devices at constant contact pressure. The experiments showed that the deformation depends strongly on geometry. Bonding parameters cannot be generalized. For layered setups, the contribution that thickness tolerances from manufacturing and leveling of surface roughnesses of sheets add to the overall deformation cannot be reliably separated. After diffusion bonding, thickness tolerances increase with a lateral dimension. Obviously, the stiffness of the pressure dies is crucial.

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Approach to Improve the Reproducibility and to Decrease the Deformation During Diffusion Bonding of Parts with Arbitrary Geometries

Gietzelt,

Toth,

Levchenko

et al. 2024

Proceedings in Engineering Mechanics

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The Selection of Appropriate Process Parameters of Diffusion Bonding in Heterogeneous Weld of 355J2/AISI 316L Steels

Cited by 6 publications

References 4 publications

Comprehensive Study of the Influence of the Bonding Temperature and Contact Pressure Regimes during Diffusion Bonding on the Deformation and Mechanical Properties of AISI 304

Comprehensive Study of the Influence of the Bonding Temperature and Contact Pressure Regimes during Diffusion Bonding on the Deformation and Mechanical Properties of AISI 304

Comprehensive Study of the Deformation Behavior during Diffusion Bonding of 1.4301 (AISI 304) as a Function of Material Width and Aspect Ratio

Approach to Improve the Reproducibility and to Decrease the Deformation During Diffusion Bonding of Parts with Arbitrary Geometries

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