Evaluation of microstructure and mechanical properties of transient liquid phase bonding of Inconel 718 and nano/ultrafine-grained 304L stainless steel

Ghaderi, Sina; Karimzadeh, Fathallah; Ashrafi, Ali

doi:10.1016/j.jmapro.2019.11.005

Cited by 33 publications

(8 citation statements)

References 27 publications

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“…The grain sizes of the solid solution here are notably smaller compared to those that eventually form towards the joint center as isothermal solidification proceeds. Similar findings were reported by Ghaderi et al, [9] who attributed this to boride formation in the region close to the base metal providing a barrier to grain growth. In this case it is presumed that the Ni-Ge-Nb phase similarly hindered grain growth.…”

Section: Isothermal Solidification Solid Homogenizationsupporting

confidence: 90%

“…pct C 0 = 2.5 at. pct w = 65 lm (based on width following base metal dissolution) D = 6.22x10 À11 m 2 s À1 [9,40] Using Eq. [4], the expected time for IS to complete based only on B diffusion is approximately 30 minutes.…”

Section: ½4mentioning

confidence: 99%

“…[7,8] A joint examined at this stage may exhibit two phenomena often referred to as the isothermally solidified zone (ISZ), and the athermally solidified zone (ASZ). Furthermore, fast diffusing elements such as boron can react with the base metal elements, creating what is commonly referred to as a diffusion-affected zone (DAZ) at the interface of filler metal and into the base metal, [9,10] which may remain even if isothermal solidification is complete within the joint. These phenomena are represented in Figure 1(e).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of a Novel Ni-Based Multi-principal Element Alloy Filler Metal, Using an Alternative Melting Point Depressant

Hardwick

Rodgers

Pickering

et al. 2021

Metall Mater Trans A

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Brazing is a crucial joining technology in industries where nickel-superalloy components must be joined. Nickel-based brazing filler metals are extensively employed, possessing excellent mechanical properties, corrosion resistance, and retained strength at elevated temperatures. To function as a filler metal, the alloy melting point must be reduced to below that of the materials being joined, but the addition of melting point depressants (MPDs) such as boron, silicon, and phosphorus can, however, lead to the formation of brittle intermetallics, potentially compromising the joint performance. In the present work, a novel multi-principal element brazing alloy (in the style of a high entropy alloy), utilizing Ge as an alternative MPD along with a reduced B addition, is investigated. The design process considered binary phase diagrams and predictions based on Thermo-Calc software and empirical thermodynamic parameters. The alloy was used to vacuum braze nickel-superalloy Inconel-718, and microstructural and mechanical investigations are reported. The maximum shear strength achieved was 297 MPa with a brazing temperature of 1100 °C and 60-minute hold time, with isothermal solidification completed. Shear strength was only slightly reduced with increased joint width. Assessments are made of the ability to accurately predict properties of multi-principle element alloys using Thermo-Calc software and empirical thermodynamic parameters.

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Section: Isothermal Solidification Solid Homogenizationsupporting

confidence: 90%

Section: ½4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of a Novel Ni-Based Multi-principal Element Alloy Filler Metal, Using an Alternative Melting Point Depressant

Hardwick

Rodgers

Pickering

et al. 2021

Metall Mater Trans A

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show abstract

“…The result also confirms the presence of the higher amount of Si at ISZ, revealing the negligible amount of diffusion of Si from the filler material into the IN 718. This is attributed to the very low diffusivity of Si in Ni compared to B [37].…”

Section: Fesem and Eds Resultsmentioning

confidence: 99%

Thermal Properties of Ni–Cr–Si–B–Fe Based Interlayer Material and Its Application in TLP Bonding of IN 718 Superalloy

Tarai

Robi

Pal

2020

Acta Metall. Sin. (Engl. Lett.)

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A new Ni-Cr-Si-B-Fe filler material is prepared for transient liquid-phase (TLP) bonding of Inconel 718 superalloy by mechanical alloying technique. The melting temperature range of the filler material and its activation energy of melting are determined by differential scanning calorimetry technique. The activation energy and melting temperature of the alloy powder decrease with increasing milling time. Inconel 718 alloy was joined via TLP by using the newly developed filler material. The effect of TLP bonding temperature and time on microstructural evolution and mechanical properties of the joint was investigated. Three distinct microstructural regions were observed in the bonding area: isothermal solidification zone consisting of a single-phase solid solution, diffusion affected zone consisting of extensive diffusion-induced precipitates of metallic boride, and unaffected base material. The ultimate shear strength and microhardness of the TLP-bonded joint increase with bonding time and temperature.

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“…Samples were then wrapped in Kanthal wire that has a lower coefficient of thermal expansion than 316L and Zircaloy-4 so that pressure builds up during heating. Taking advantage of different coefficients of thermal expansion to generate pressure for diffusion bonding is not unusual [60][61][62] and can be complemented by clamp-like apparatuses that apply compression using screws [63][64][65][66][67]. If the sample geometry allows it, parts can also be press-fitted and put under pressure into a vacuum furnace where they are then diffusion bonded when the temperature is increased [68][69][70].…”

Section: Diffusion Bondingmentioning

confidence: 99%

Diffusion Bonding and Transient Liquid Phase (TLP) Bonding of Type 304 and 316 Austenitic Stainless Steel—A Review of Similar and Dissimilar Material Joints

Alhazaa

Haneklaus

2020

Metals

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Similar and dissimilar material joints of AISI grade 304 (1.4301) and AISI grade 316 (1.4401) austenitic stainless steel by solid state diffusion bonding and transient liquid phase (TLP) bonding are of interest to academia and industry alike. Appropriate bonding parameters (bonding temperature, bonding time, and bonding pressure) as well as suitable surface treatments, bonding atmosphere (usually high vacuum or protective gas) and interlayers are paramount for successful bonding. The three main parameters (temperature, time, and pressure) are interconnected in a strong non-linear way making experimental data important. This work reviews the three main parameters used for solid state diffusion bonding, TLP bonding and to a smaller degree hot isostatic pressing (HIP) of AISI grade 304 and AISI grade 316 austenitic stainless steel to the aforementioned materials (similar joints) as well as other materials, namely commercially pure titanium, Ti-6A-4V, copper, zircaloy and other non-ferrous metals and ceramic materials (dissimilar joints).

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Evaluation of microstructure and mechanical properties of transient liquid phase bonding of Inconel 718 and nano/ultrafine-grained 304L stainless steel

Cited by 33 publications

References 27 publications

Development of a Novel Ni-Based Multi-principal Element Alloy Filler Metal, Using an Alternative Melting Point Depressant

Development of a Novel Ni-Based Multi-principal Element Alloy Filler Metal, Using an Alternative Melting Point Depressant

Thermal Properties of Ni–Cr–Si–B–Fe Based Interlayer Material and Its Application in TLP Bonding of IN 718 Superalloy

Diffusion Bonding and Transient Liquid Phase (TLP) Bonding of Type 304 and 316 Austenitic Stainless Steel—A Review of Similar and Dissimilar Material Joints

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