Microstructure evolution in a single crystal nickel-based superalloy joint by linear friction welding

Ma, Tiejun; Yan, Maode; Yang, Xiawei; Li, Wenya; Chao, Yuh J.

doi:10.1016/j.matdes.2015.07.046

Cited by 25 publications

(6 citation statements)

References 27 publications

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“…Compared with traditional fusion welding technologies, LFW has many advantages such as less defect formation and the ability to join dissimilar materials and complex geometrical components, and it often negates the need for protective gas [10]. To date, LFW has been successfully used to join titanium alloys [9][10][11][12], nickel-base alloys [13,14] as well as other materials [15][16][17]. More importantly, the process can be viable for the production of dissimilar welds.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Zhao

2016

Metals

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Titanium alloys, which are important in aerospace application, offer different properties via changing alloys. As design complexity and service demands increase, dissimilar welding of the titanium alloys becomes a particular interest. Linear friction welding (LFW) is a relatively novel bond technique and has been successfully applied for joining titanium alloys. In this paper, dissimilar joints with Ti-6Al-4V and Ti-5Al-2Sn-2Zr-4Mo-4Cr alloys were produced by LFW process. Microstructure was studied via optical microscopy and scanning electron microscopy (SEM), while the chemical composition across the welded samples was identified by energy dispersive X-ray spectroscopy. Mechanical tests were performed on welded samples to study the joint mechanical properties and fracture characteristics. SEM was carried out on the fracture surface to reveal their fracture modes. A significant microstructural change with fine re-crystallization grains in the weld zone (WZ) and small recrystallized grains in the thermo-mechanically affected zone on the Ti-6Al-4V side was discovered in the dissimilar joint. A characteristic asymmetrical microhardness profile with a maximum in the WZ was observed. Tensile properties of the dissimilar joint were comparable to the base metals, but the impact toughness exhibited a lower value.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Zhao

2016

Metals

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“…Interest in these alloys is due to the possibility of achieving higher alloy characteristics. Intermetallic alloys based on Ni 3 Al are used in parts of combustion chambers of aircraft engines with operating temperatures up to 1300 • C. Methods for joining metals and superalloys include diffusion welding [15,23], fusion welding, friction welding [24][25][26][27][28], diffusion welding in a liquid phase [29], friction stir welding [28], etc. When dissimilar metals are joined together in solid phases, undesirable brittle intermetallic phases are often formed, which reduce the mechanical properties of parts [3,6,7,12,30].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Diffusion Bonding of Different Heat Resistant Nickel-Base Alloys

et al. 2020

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Currently, an important fundamental problem of practical importance is the production of high-quality solid-phase compounds of various metals. This paper presents a theoretical model that allows one to study the diffusion process in nickel-base refractory alloys. As an example, a two-dimensional model of ternary alloy is considered to model diffusion bonding of the alloys with different compositions. The main idea is to divide the alloy components into three groups: (i) the base element Ni, (ii) the intermetallic forming elements Al and Ti and (iii) the alloying elements. This approach allows one to consider multi-component alloys as ternary alloys, which greatly simplifies the analysis. The calculations are carried out within the framework of the hard sphere model when describing interatomic interactions by pair potentials. The energy of any configuration of a given system is written in terms of order parameters and ordering energies. A vacancy diffusion model is described, which takes into account the gain/loss of potential energy due to a vacancy jump and temperature. Diffusion bonding of two dissimilar refractory alloys is modeled. The concentration profiles of the components and order parameters are analyzed at different times. The results obtained indicate that the ternary alloy model is efficient in modeling the diffusion bonding of dissimilar Ni-base refractory alloys.

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“…The solid-state bonding and friction welding can obtain a high-quality joint with uniform microstructure and excellent mechanical performance. For example, T.J. Ma et al [15] employed linear friction welding to join the DD6 single crystal superalloy, and the tensile strength of the joints obtained reached 837.5 MPa. A large load, however, will be needed when introducing such joining technologies (solid-state bonding and friction welding), making them unsuitable for the joining of the single crystal superalloy gas turbine blades with a complicated structure.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Performance of the DD98M-DD98M Single Crystal Superalloy Joints Brazed Using a Pd-Si Composite Filler

Qin

Zhou³

et al. 2019

Metals

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In this work, the DD98M single crystal superalloys were brazed to themselves using a Pd-Si composite filler. The effect of brazing temperature and soaking time on the microstructure and mechanical behavior of the joints was studied. The microstructure and phase constitution in the joint were identified by the SEM and EDS analysis. The results indicated that the joint obtained was constituted by DD98M/zone 2/zone 1/zone 2/DD98M. The zone 1 was primarily made up of the Ni (Pd, Cr, Co) (s.s), Pd4Si, Pd (Ni, Ti, Al) (s.s) and Pd-rich Ni (Pd, Cr, Co) (s.s), while the zone 2 consisted of the Ni (Pd, Cr, Co) (s.s) and Al2Pd5. During the brazing process, increasing the brazing temperature strengthened the fluidity of the liquid filler, which was favorable to eliminating the solidified pores in the brazing seam. Furthermore, a higher brazing temperature would cause the phases in the zones 1 and 2 to be coarsened remarkably. When setting the brazing temperature to 1060 °C, extending the soaking time made the amount of Pd (Ni, Ti, Al) (s.s) decrease, whereas the amount of Pd4Si increased, because the peritectic reaction between the Pd (Ni, Ti, Al) (s.s) and remnant liquid filler was enhanced. Among the brazing process parameters under investigation, the maximum joint average shear strength obtained reached 338 MPa when the joint was brazed at 1060 °C for 30 min. A ductile fracture mode happened during the shear tests under a joining condition. The work performed can provide valuable data to design the single crystal superalloy brazed joint.

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Microstructure evolution in a single crystal nickel-based superalloy joint by linear friction welding

Cited by 25 publications

References 27 publications

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Simulation of Diffusion Bonding of Different Heat Resistant Nickel-Base Alloys

Microstructure and Mechanical Performance of the DD98M-DD98M Single Crystal Superalloy Joints Brazed Using a Pd-Si Composite Filler

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