Friction stir welding of a сarbon-doped CoCrFeNiMn high-entropy alloy

Shaysultanov, D.G.; Stepanov, Nikita; Malopheyev, Sergey; Vysotskiy, Igor; Санин, В. Н.; Mironov, S.; Kaibyshev, Rustam; Салищев, Г. А.; Zherebtsov, Sergey

doi:10.1016/j.matchar.2018.08.063

Cited by 91 publications

(40 citation statements)

References 45 publications

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“…The obtained results demonstrate for the first time the possibility to produce sound butt joints of the Ti 1.89 NbCrV 0.56 RHEA by LBW, which is an important step toward potential practical applications of this new class of metallic alloys. However, the present study also emphasized the importance of LBW process parameters (particularly pre-heating temperature) to obtain good results, which is quite different from the transition metals HEAs [27][28][29][30][31][32]44,45]. Given the wide range of the available RHEAs compositions [7], specific attention should be paid to select proper welding conditions for each individual alloy.…”

Section: Discussionmentioning

confidence: 84%

“…Weldability is another crucial technological property of the structural materials, since welding is one of the most reliable and efficient ways of joining different parts together. A few studies on welding of HEAs were reported recently [27][28][29][30][31][32]. The efficiency of using arc welding [28], laser beam welding (LBW) [31], electron beam welding [27,28], and friction stir welding [29,30,32] was shown to obtain sound joints in HEAs with reasonable mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Panina

Yurchenko

Zherebtsov

et al. 2019

Metals

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The effect of laser beam welding on the structure and properties of a Ti1.89NbCrV0.56 refractory high entropy alloy was studied. In particular, the effect of different pre-heating temperatures was examined. Due to the low ductility of the material, laser beam welding at room temperature resulted in the formations of hot cracks. Sound butt joints without cracks were produced using pre-heating to T ≥ 600 °C. In the initial as-cast condition, the alloy consisted of coarse bcc grains with a small amount of lens-shaped C15 Laves phase particles. A columnar microstructure was formed in the welds; the thickness of the grains increased with the temperature of pre-heating before welding. The Laves phase particles were formed in the seams after welding at 600 °C or 800 °C, however, these particles were not observed after welding at room temperature or at 400 °C. Soaking at elevated temperatures did not change the microstructure of the base material considerably, however, “additional” small Laves particles formed at 600 °C or 800 °C. Tensile test of welded specimens performed at 750 °C resulted in the fracture of the base material because of the higher hardness of the welds. The latter can be associated with the bcc grains refinement in the seams.

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Panina

Yurchenko

Zherebtsov

et al. 2019

Metals

Self Cite

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“…As previously mentioned, welding materials in the solid state can be a reliable and advantageous way to achieve sound joints. The current information regarding welding HEAs using solid-state techniques shows that most studies are focused on friction stir welding (FSW) [55,[86][87][88][89][90][91][92]. Nevertheless, other possibilities for joining these materials are rotary friction welding [91] and diffusion bonding [92].…”

Section: Solid-state Welding Of Heasmentioning

confidence: 99%

“…After being produced via thermite-type self-propagating hightemperature synthesis, the samples were cold-rolled and annealed at 900 °C for 1 h, to obtain an equiaxed microstructure. The welds resultant from the FSW process were defect-free, while On another perspective, Shaysultanov et al [90] performed FSW on a carbon-doped CoCrFeNiMn HEA, with the intent of studying the influence this controlled C addition on the welded joints mechanical performance. After being produced via thermite-type self-propagating high-temperature synthesis, the samples were cold-rolled and annealed at 900 • C for 1 h, to obtain an equiaxed microstructure.…”

Section: Solid-state Welding Of Heasmentioning

confidence: 99%

A Short Review on Welding and Joining of High Entropy Alloys

Lopes

Oliveira

2020

Metals

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High entropy alloys are one of the most exciting developments conceived in the materials science field in the last years. These novel advanced engineering alloys exhibit a unique set of properties, which include, among others, good mechanical performance under severe conditions in a wide temperature range and high microstructural stability over long time periods. Owing to the remarkable properties of these alloys, they can become expedite solutions for multiple structural and functional applications. Nevertheless, like any other key engineering alloy, their capacity to be welded, and thus become a permanent feature of a component or structure, is a fundamental issue that needs to be addressed to further expand these alloys’ potential applications. In fact, welding of high entropy alloys has attracted some interest recently. Therefore, it is important to compile the available knowledge on the current state of the art on this topic in order to establish a starting point for the further development of these alloys. In this article, an effort is made to acquire a comprehensive knowledge on the overall progress on welding of different high entropy alloy systems through a systematic review of both fusion-based and solid-state welding techniques. From the current literature review, it can be perceived that welding of high entropy alloys is currently gaining more interest. Several high entropy alloy systems have already been successfully welded. However, most research works focus on the well-known CoCrFeMnNi. For this specific system, both fusion and solid-state welding have been used, with no significant degradation of the joints’ mechanical properties. Among the different welding techniques already employed, laser welding is predominant, potentially due to the small size of its heat source. Overall, welding of high entropy alloys is still in its infancy, though good perspectives are foreseen for the use of welded joints based on these materials in structural applications.

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“…Several works have studied the friction stir welding (FSW) of HEA systems [ 29 , 33 , 34 , 35 , 36 , 37 ]. Different from arc, laser and electron beam welding, FSW ( Figure 8 ) is a form of solid-state joining, in which two facing workpieces are jointed through the heat generated by friction between the rotating of a non-consumable tool and the workpiece material [ 38 ].…”

Section: Welding Of Heas In Different Welding Processesmentioning

confidence: 99%

Welding of High Entropy Alloys—A Review

Guo

Tang

Rothwell

et al. 2019

Entropy

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High-entropy alloy (HEA) offers great flexibility in materials design with 3–5 principal elements and a range of unique advantages such as good microstructure stability, mechanical strength over a broad range of temperatures and corrosion resistance, etc. Welding of high entropy alloy, as a key joining method, is an important emerging area with significant potential impact to future application-oriented research and technological developments in HEAs. The selection of feasible welding processes with optimized parameters is essential to enhance the applications of HEAs. However, the structure of the welded joints varies with material systems, welding methods and parameters. A systemic understanding of the structures and properties of the weldment is directly relevant to the application of HEAs as well as managing the effect of welding on situations such as corrosion that are known to be a service life limiting factor of welded structures in conditions such as marine environments. In this paper, key recent work on welding of HEAs is reviewed in detail focusing on the research of main HEA systems when applying different welding techniques. The experimental details including sample preparation, sample size (thickness) and welding conditions reflecting energy input are summarized and key issues are highlighted. The microstructures and properties of different welding zones, in particular the fusion zone (FZ) and the heat affected zones (HAZ), formed with different welding methods are compared and presented in details and the structure-property relationships are discussed. The work shows that the weldability of HEAs varies with the HEA composition groups and the welding method employed. Arc and laser welding of AlCoCrFeNi HEAs results in lower hardness in the FZ and HAZ and reduced overall strength. Friction stir welding results in higher hardness in the FZ and achieves comparable/higher strength of the welded joints in tensile tests. The welded HEAs are capable of maintaining a reasonable proportion of the ductility. The key structure changes including element distribution, the volume fraction of face centered cubic (FCC) and body centered cubic (BCC) phase as well as reported changes in the lattice constants are summarized and analyzed. Detailed mechanisms governing the mechanical properties including the grain size-property/hardness relationship in the form of Hall–Petch (H–P) effect for both bulk and welded structure of HEAs are compared. Finally, future challenges and main areas to research are highlighted.

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Friction stir welding of a сarbon-doped CoCrFeNiMn high-entropy alloy

Cited by 91 publications

References 45 publications

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Laser Beam Welding of a Low Density Refractory High Entropy Alloy

A Short Review on Welding and Joining of High Entropy Alloys

Welding of High Entropy Alloys—A Review

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