Butt friction stir welding of commercially pure titanium by the tool from a heat-resistant nickel alloy

Amirov, Alihan; Елисеев, А. А.; Рубцов, В. Е.; Utyaganova, V. R.

doi:10.1063/1.5131883

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…The FSP was carried out in the direction parallel to the rolling direction. The processing was conducted using the process parameters at which the highest weld strength was achieved as reported elsewhere [34]. The axial force on the tool during both plunging (F pl ) and processing (F pr ) was maintained at 7848 N, the traverse speed (V) was 180 mm/min, and the tool rotation rate (ω) was 950 rpm.…”

Section: Investigative Techniquesmentioning

confidence: 99%

“…In practice, this superalloy has been successfully applied since the 1960s for the manufacture of turbine blades operating under high temperatures and mechanical loads [33]. A recent study [34] has shown the possibility of using the Ni-based superalloy as a material for making a tool for FSW on titanium alloys. However, the tool life has not yet been considered.…”

Section: Introductionmentioning

confidence: 99%

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Wear of ZhS6U Nickel Superalloy Tool in Friction Stir Processing on Commercially Pure Titanium

Amirov

Елисеев

Колубаев

et al. 2020

Metals

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The use of electric arc or gas welding in the manufacture of titanium components often results in low quality welded joints due to large residual stresses and strains. A successful solution to this problem can be found in the application of friction stir welding. However, friction stir welding (FSW) of titanium alloys is complicated by rapid tool wear under high loads and temperatures achieved in the process. This paper studies the durability of a tool made of ZhS6U Ni-based superalloy used for friction stir processing of commercially pure titanium and the effect of the tool wear on the weld quality. The total length of the titanium weld formed by the tool without failure comprised 2755 mm. The highest wear of the tool is observed at the base of the pin, which brings about the formation of macrodefects in the processed material. The tool overheating causes an increase in the dendrite element size of ZhS6U alloy. The transfer layer contains chemical elements of this alloy, indicating that the tool wear occurs by diffusion and adhesion. As a result of processing, the tensile strength of commercially pure titanium increased by 25%.

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Section: Investigative Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wear of ZhS6U Nickel Superalloy Tool in Friction Stir Processing on Commercially Pure Titanium

Amirov

Елисеев

Колубаев

et al. 2020

Metals

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“…Argon was fed into the process zone through the nozzle marked with a green arrow in Figure 2a. FSP was performed using the process parameters that provided the highest weld strength in our previous studies [33,34]. The axial load on the tool during processing was 950 kgf, the traverse speed of the tool was 180 mm/min, and the rotational speed was 950 rpm.…”

Section: Materials and Experimental Set-upmentioning

confidence: 99%

“…The first-generation superalloys contain tungsten, chromium, molybdenum, and niobium and are relatively inexpensive. The most popular alloy of this generation is ZhS6U (analogous to MAR-M247 alloy), which was used as a tool material for the FSW of steel [32] and titanium alloys [33]. Previously, we studied the durability of such a tool and the effect of its wear on the strength of FSWed titanium alloy [34].…”

Section: Introductionmentioning

confidence: 99%

Wear of Ni-Based Superalloy Tools in Friction Stir Processing of Commercially Pure Titanium

2023

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Conventional methods for joining titanium alloys often provide a relatively low quality of joints impaired by high residual stresses. A possible solution to this problem can be offered by friction stir welding, which has been increasingly used for aluminum alloys. However, the friction stir welding of titanium alloys is complicated by severe tool wear due to high loads and temperatures in the process. Good results were reported for a tool made of ZhS6U superalloy, but tool life still needs to be improved. Here, we study the wear of a tool made of ZhS32 Ni-based superalloy, which has higher heat resistance than ZhS6U, and the wear of a liquid-cooled ZhS6U tool in the friction stir processing of commercially pure titanium. The effect of tool wear on the strength characteristics of the processed material is discussed. The total processing path length traversed by the tools without failure was 2790 mm. In both cases, the most severe wear was observed at the pin root. Liquid cooling significantly reduced the wear. Based on the obtained results, tool wear is proposed to occur by an adhesion–diffusion mechanism during friction stir processing.

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“…Many researchers have studied the joining of Ti and Ni-based alloys using laser welding, electron beam and friction stir welding. 15,[23][24][25] However, limited studies have been carried out on the TIG welding of dissimilar Ti and Inconel alloys. According to the comprehensive literature review carried out by the authors, TIG welding of CpTi and IN718 using Nb as an interlayer has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer

Shehbaz

Junaid

Khan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The formation of brittle intermetallics is a challenge for the direct joining of commercially pure titanium (CpTi) and Inconel 718 (IN718) alloy. In the present work, dissimilar weldments using the P-TIG (Pulsed-Tungsten Inert Gas) welding technique were produced, with elemental Niobium (Nb) as an interlayer. The insertion of Nb acted as a barrier and suppressed the interdiffusion of Ti and Ni across the interlayer resulting in no TixNiy intermetallic compounds (IMCs) at the CpTi/IN718 dissimilar joint. Titanium (Ti) and Nb on CpTi side joined by solid solution (Ti, Nb) strengthening mechanism. Nickel (Ni) joined with Nb at IN718 side via eutectic reaction, where a diffused layer comprising of NbNi3, and Nb7Ni6 IMCs was found. Owing to the formation of brittle IMCs (NbNi3, Nb7Ni6), the diffused layer at Nb/IN718 interface exhibited the microhardness of ∼782 HV, which is ∼64% higher than the Nb/CpTi interface and considered highest in comparison to the other regions of the joint. The maximum tensile strength of the weldment was 150 MPa, which is significantly less than CpTi (360 MPa) and IN718 (850 MPa) base alloys possibly due to the presence of cracks in the diffused layer and the welded joint.

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Butt friction stir welding of commercially pure titanium by the tool from a heat-resistant nickel alloy

Cited by 10 publications

References 12 publications

Wear of ZhS6U Nickel Superalloy Tool in Friction Stir Processing on Commercially Pure Titanium

Wear of ZhS6U Nickel Superalloy Tool in Friction Stir Processing on Commercially Pure Titanium

Wear of Ni-Based Superalloy Tools in Friction Stir Processing of Commercially Pure Titanium

Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer

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