Effect of post-bond heat treatment on microstructure and mechanical properties of the wide gap TLP bonded IC10 superalloy with a low boron Ni3Al-based interlayer

Xiong, Yu; Liu, Fengmei; Li, Qi; Qin, Hongbo; Gao, Haitao; Li, Likun; Yi, Yaoyong

doi:10.1016/j.jmapro.2020.03.002

Cited by 26 publications

(5 citation statements)

References 32 publications

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“…Since both the filler alloy and the BM are superalloys, it can be assumed that they have the same density. Therefore, the dissolution ratio D can also be represented by the following equation [30]:…”

Section: Microstructure Of Brazed Jointmentioning

confidence: 99%

Effects of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of the Brazed Joint of a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy

et al. 2023

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A novel fourth-generation nickel-based single crystal superalloy was brazed with Co-based filler alloy. The effects of post-weld heat treatment (PWHT) on the microstructure and mechanical properties of brazed joints were investigated. The experimental and CALPHAD simulation results show that the non-isothermal solidification zone was composed of M3B2, MB-type boride and MC carbide, and the isothermal solidification zone was composed of γ and γ’ phases. After the PWHT, the distribution of borides and the morphology of the γ’ phase were changed. The change of the γ’ phase was mainly attributed to the effect of borides on the diffusion behavior of Al and Ta atoms. In the process of PWHT, stress concentration leads to the nucleation and growth of grains during recrystallization, thus forming high angle grain boundaries in the joint. The microhardness was slightly increased compared to the joint before PWHT. The relationship between microstructure and microhardness during the PWHT of the joint was discussed. In addition, the tensile strength and stress fracture life of the joints were significantly increased after the PWHT. The reasons for the improved mechanical properties of the joints were analyzed and the fracture mechanism of the joints was elucidated. These research results can provide important guidance for the brazing work of fourth-generation nickel-based single crystal superalloy.

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Section: Microstructure Of Brazed Jointmentioning

confidence: 99%

Effects of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of the Brazed Joint of a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy

et al. 2023

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“…Melting point depressants (MPDs) such as B, Si and Hf will diffuse from the liquid layer to the junction between the liquid phase and the base material, thus reducing the melting point of the base material at the edge of the liquid phase, resulting in the melting of the base material in this area. This process is essential for the formation of high-quality TLP-diffusion-bonded joints [ 11 , 12 , 13 , 14 , 15 ]. Yingjun Jiao et al used Ni-Cr-B as the interlayer material for the TLP diffusion bonding of Inconel625 and Mar-M247 superalloy.…”

Section: Introductionmentioning

confidence: 99%

Transient Liquid Phase Diffusion Bonding of Ni3Al Superalloy with Low-Boron Nickel-Base Powder Interlayer

Wen

Liu

et al. 2023

Materials

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As a technology for micro-deformed solid-phase connection, transient liquid phase (TLP) diffusion bonding plays a key role in the manufacture of heating components of aero engines. However, the harmful brittle phase and high hardness limit the application of TLP diffusion bonding in nickel-based superalloys. In this paper, a new strategy in which a low-boron and high-titanium interlayer can restrain the brittle phase and reduce the hardness of the TLP-diffusion-bonded joint is proposed. With this strategy, the Ni3Al joint can achieve a high strength of 860.84 ± 26.9 MPa under conditions of 1250 °C, 6 h and 5 MPa. The microhardness results show that the average microhardness of the joint area is 420.33 ± 3.15 HV and is only 4.3% higher than that of the Ni3Al base material, which proves that this strategy can effectively inhibit the formation of the harmful brittle phase in the joint area. The results of EBSD show that 7.7% of the twin boundaries exist in the isothermal solidification zone, and only small amounts of secondary precipitates are observed at the grain boundaries in the joint, which indicates that twin boundaries may play a dominant role in crack initiation. This study provides a feasible avenue to suppress the brittle phase in TLP-diffusion-bonded joints.

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“…Until now, some investigations have been performed on the effect of PBHT on the mechanical properties and microstructural evolution of TLP bonding of Inconel alloys [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

Tarai

Pal²,

Robi³

2023

Preprint

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Transient liquid phase (TLP) bonding can be used to join Inconel 718 superalloy because the bond properties are similar to the parent material properties and little melting of base material. Presence of centerline eutectic and boride precipitates in the microstructure of the TLP bonded Inconel 718 joints affects mechanical properties of the joints. The eutectics and borides should be minimized to enhance the mechanical properties of the bond. This can be achieved to a great extent by prolonged isothermal holding. However, it can induce adverse effects by modifying the microstructure of the base material. Post bond heat treatment (PBHT) processes can be implemented to improve the mechanical properties without inducing any harmful effect of prolonged heating. In the present work, the effect of PBHT technique (i.e. solution treatment and double aging) on the microstructural evolution and improvement in mechanical properties were investigated. The ultimate tensile strength (UTS) and microhardness of TLP bond before and after the PBHT were analyzed and compared with the as-received workpiece. FESEM, FETEM and XRD analysis were used to quantify different precipitates formed during PBHT of TLP bond. The results showed that the PBHT improved the microstructure and mechanical properties of the bonded samples. After the solution treatment and double aging, a maximum UTS of 1210 MPa was obtained, which correspond to a 113.5% increase. The improvement of bond strength was attributed to increase volume fraction of γ' and γ" type strengthening phases during double aging and a decrease in the fraction of Nb-Mo type borides in the diffusion affected zone.

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Effect of post-bond heat treatment on microstructure and mechanical properties of the wide gap TLP bonded IC10 superalloy with a low boron Ni3Al-based interlayer

Cited by 26 publications

References 32 publications

Effects of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of the Brazed Joint of a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy

Effects of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of the Brazed Joint of a Novel Fourth-Generation Nickel-Based Single Crystal Superalloy

Transient Liquid Phase Diffusion Bonding of Ni3Al Superalloy with Low-Boron Nickel-Base Powder Interlayer

Reduction of ASZ size and enhancement of mechanical properties of TLP bonded IN718 joint using post bond heat treatment process

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