Determining the kinetics of transient liquid phase bonding (TLPB) of inconel 625/BNi-2 couples using differential scanning calorimetry

Murray, D C; Corbin, Stephen F.

doi:10.1016/j.jmatprotec.2017.05.013

Cited by 41 publications

(13 citation statements)

References 16 publications

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“…It can be seen that an obviously exothermic peak #1 and an endothermic peak #2 appear. The occurrence of the exothermic peak #1 corresponds to the transition from metastable amorphous produced by the rapid solidification of the foil during processing to a stable crystalline phase, which have been mention in the study of Murray and Corbin [ 23 ]. The endothermic peak #2 appearing on the curve corresponds to the melting point of the BNi2 filler metal.…”

Section: Resultsmentioning

confidence: 99%

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

Liu

Ouyang

et al. 2020

Materials

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The wetting kinetics of nickel-based filler metal (BNi2) over selective laser-melted Ti-6Al-4V (SLMed TC4) titanium alloy in a protective argon atmosphere is experimentally investigated using a real-time in situ hot stage equipped with an optical microscope. The spreading processes at different temperatures are similar, and the overall wetting/spreading process can be roughly divided into three stages: (i) an initial stage, (ii) a rapid spreading stage, and (iii) an asymptotic stage. Moreover, the wetting kinetics of the BNi2/SLMed TC4 system can be expressed by empirical power exponential function Rn~t with n = ~1. In the process of spreading, Ti-based solid solution (Ti(ss)) and intermetallic compound (Ti2Ni and TiB2) were formed at the interface within the reaction domain, and the phase transition of α’ martensitic to α-Ti and β-Ti also took place. The influence of elevated temperature on the spreading and wetting kinetics of the BNi2/SLMed TC4 system was studied, and the results show that the increase of temperature has a slightly promoting effect on the spreading, but a limited impact on the value of n. In addition, the spreading and wetting kinetics of BNi2/SLMed TC4 system are similar to those of BNi2 on conventional forged TC4 substrate.

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Section: Resultsmentioning

confidence: 99%

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

Liu

Ouyang

et al. 2020

Materials

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“…This method allowed repeated enthalpy measurements during solidification (DH t ) as shown and discussed in greater detail by other authors. [21][22][23][24] This technique enables one to examine the rate of isothermal solidification (IS) with time (above solidus) using a single specimen, thus minimizing experimental variation while greatly reducing experimental preparation. Enthalpy measurements (DH t ) were expressed as a fraction of the total enthalpy of melting of the FM(s) (DH o ).…”

Section: Methodsmentioning

confidence: 99%

“…This DH BM measurement takes into account the thermal attenuation influence of the BM as described elsewhere. [23] Thus, each enthalpy measurement determined in the cyclic experiments, DH t , could be expressed as a fraction of the total (100 pct) liquid present (corrected for the BM presence), providing a quantitative measure of the quantity of liquid present vs brazing time. Lastly, assembly C involved carefully placing a known mass of IN718 fillings on a typical sample of BNi-2 or BNi-3.…”

Section: Methodsmentioning

confidence: 99%

“…The discrepancy between this value and the nominal starting foil thickness of 48 lm is expected to be due to the amorphous characteristics of the rapidly solidified braze foil. During brazing, the foil recrystallizes [23] and remelts as it spreads over the BM faying surface. As such, it is argued that the in situ measured filler thickness following remelting and equilibrium spreading is the most accurate measure of the starting half braze gap thickness, providing BM dissolution is negligible.…”

Section: A Base Metal Dissolutionmentioning

confidence: 99%

“…L f measurements from the DSC can be converted to the width of liquid phase present in the gap, W t (lm), and the corresponding extent of IS, W ISZ (lm), provided that the thickness of the braze gap, W o , is known. [23,24] On a full-joint basis, this yields the following expressions for the liquid width remaining (2W t ) and ISZ width (…”

Section: Determining the Influence Of Fm Composition On The Rate Omentioning

confidence: 99%

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Assessing the Influence of Cr and Fe in the Filler Metal on Dissolution and Isothermal Solidification Kinetics During TLPB of Ni-Based Superalloys

Moreau

Corbin

2020

Metall Mater Trans A

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The influence of chromium and iron's absence (BNi-3) and presence (BNi-2) in boron-containing filler metals (FM) on the TLPB behavior of IN718 base metal (BM) was examined. Results indicate that the absence of Cr and Fe in the FM significantly aggravated BM dissolution and gap widening, particularly when similar degrees of brazing beyond the FM liquidus temperature occurred. This led to a higher complete isothermal solidification time, despite a higher rate of isothermal solidification (IS) and initial boron uptake displayed by the IN718/BNi-3 joint. EDS and quantitative image analysis performed within the DAZ concluded that differences observed in the rate of IS were related to the amount and type of borides forming in the DAZ. The lack of Cr in the BNi-3 favored the formation of Cr-poor:B-rich Cr(Mo,Nb)B borides, leading to a higher rate of B uptake by the base metal. Joints made from the Cr containing BNi-2 FM displayed a combination of Cr-rich:B-poor CrB and Cr(Mo,Nb)B borides leading to lower rates of B uptake.

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Effect of Holding Time on Microstructure and Mechanical Properties of Dissimilar γ'‐Strengthened Superalloys TLP Joint

Yang

Ding

Wang³

et al. 2023

Adv Eng Mater

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To achieve efficient connectivity of dissimilar γ'‐strengthened superalloy, transient liquid‐phase (TLP) diffusion bonding of 718Plus and Ni3Al‐based superalloys is carried out using BNi‐2 interlayer at a constant temperature of 1100 °C with holding times of 3, 15, 30, and 60 min. It is shown in the results that when the holding time is insufficient, isothermal solidification transforms into athermal solidification. Due to the enrichment of B and Cr elements in liquid phase, ternary eutectic consisting of γ, Ni3B, and CrB is formed at the joint center. Ternary eutectic with higher hardness (≈600 Hv) is poorly bonded to the matrix, which can easily become crack initiation location and significantly deteriorated the tensile properties. In addition, microhardness of the joint becomes more uniform and tensile strength gradually increases due to the reduction of eutectic with holding time increasing. Isothermal solidification completes and a joint without eutectic structure is formed at 1100 °C for 60 min. Diffusion of Al atoms leads to the formation of γ' with gradient size and tensile strength is comparable to that of base metal which is about 690.93 MPa.

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Determining the kinetics of transient liquid phase bonding (TLPB) of inconel 625/BNi-2 couples using differential scanning calorimetry

Cited by 41 publications

References 16 publications

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

Assessing the Influence of Cr and Fe in the Filler Metal on Dissolution and Isothermal Solidification Kinetics During TLPB of Ni-Based Superalloys

Effect of Holding Time on Microstructure and Mechanical Properties of Dissimilar γ'‐Strengthened Superalloys TLP Joint

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