Weldability of cast CoCrFeMnNi high-entropy alloys using various filler metals for cryogenic applications

Nam, Hyunbin; Park, Sang Won; Park, Nokeun; Na, Young Sang; Kim, Hyoungseop; Yoo, Sun-Joon; Moon, Young-Hoon; Kang, Ning

doi:10.1016/j.jallcom.2019.153278

Cited by 37 publications

(17 citation statements)

References 29 publications

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“…Currently, only a limited number of studies are available for basic thermophysical properties of HEAs/CCAs (see Table 2), which will be important for the welding of components in Fig. 4 Mean values and corresponding error bars of the yield stress at 0.2% plastic strain (R p0.2 ), the ultimate tensile stress (R m ), elongation to fracture (ε), and hardness (HV0.1 to HV0.5) of the equiatomic CoCrFeMnNi BM and WM for different welding processes: TIG: [45,48,52], FSW: [47,53,54], LB: [41,42,45,49,50,55] terms of the calculation of cooling times, weld distortion effects, or suitable weld heat input calculation for multi-layer welding. The CoCrFeMnNi alloy has a relatively low thermal conductivity [62], i.e., about one-third of high-alloyed austenitic steels [64], but it has a comparable heat capacity [35] to that of ferritic and austenitic steels [63,64].…”

Section: Thermophysical Properties Vs Weldingmentioning

confidence: 99%

Welding of high-entropy alloys and compositionally complex alloys—an overview

et al. 2021

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High-entropy alloys (HEAs) and compositionally complex alloys (CCAs) represent new classes of materials containing five or more alloying elements (concentration of each element ranging from 5 to 35 at. %). In the present study, HEAs are defined as single-phase solid solutions; CCAs contain at least two phases. The alloy concept of HEAs/CCAs is fundamentally different from most conventional alloys and promises interesting properties for industrial applications (e.g., to overcome the strength-ductility trade-off). To date, little attention has been paid to the weldability of HEAs/CCAs encompassing effects on the welding metallurgy. It remains open whether welding of HEAs/CCAs may lead to the formation of brittle intermetallics and promote elemental segregation at crystalline defects. The effect on the weld joint properties (strength, corrosion resistance) must be investigated. The weld metal and heat-affected zone in conventional alloys are characterized by non-equilibrium microstructural evolutions that most probably occur in HEAs/CCAs. The corresponding weldability has not yet been studied in detail in the literature, and the existing information is not documented in a comprehensive way. Therefore, this study summarizes the most important results on the welding of HEAs/CCAs and their weld joint properties, classified by HEA/CCA type (focused on CoCrFeMnNi and AlxCoCrCuyFeNi system) and welding process.

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Section: Thermophysical Properties Vs Weldingmentioning

confidence: 99%

Welding of high-entropy alloys and compositionally complex alloys—an overview

et al. 2021

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“…Several studies [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] have already been reported on fusion-based welding of HEAs. To date, these works focus mainly on laser-based techniques, although some information is also available on Electron Beam and Gas Tungsten Arc Welding (GTAW) techniques.…”

Section: Fusion-based Welding Of Heasmentioning

confidence: 99%

“…Nam et al [63] evaluated the use of two different filler materials during similar GTAW of an CoCrFeMnNi HEA. The selected filler materials were a 308 L stainless steel, while the other had the same composition as the BM.…”

Section: Cocrfenimn Hea Systemmentioning

confidence: 99%

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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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“…Previous studies on the laser welding of HEAs mainly focus on the weldability of base HEAs manufactured by different methods [12,15] or on the feasibility of HEAs as filler metals [16,17]. Nevertheless, laser welding with preplacing HEA powders in the gap between base HEAs is worthy to be noticed due to its application in the rehabilitation of HEA-based parts in future engineering.…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of Feconicrmn High-Entropy Alloys with Preplaced Powders

Zhou

Zheng

et al. 2020

Metals

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In this paper, as-annealed FeCoNiCrMn plates were laser-welded with preplaced FeCoNiCrMn and FeCoNiCrAl powders, respectively. The grains in the fusion zone of the weld with FeCoNiCrMn powder have a reduced aspect ratio compared to those without preplaced powders and the weld with FeCoNiCrAl powder presents relative equiaxed grains. The yield strength of each weld has been remarkably enhanced when referring to the base alloy, and the ultimate tensile strength of each weld with preplaced powder exceeds 80% of that of the base and the maximum reaches 88.5% when referring to the weld with preplaced FeCoNiCrMn powder. Cleavage fractography was observed in the welds. The finding of this work will service the engineering practices of high-entropy alloys.

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Weldability of cast CoCrFeMnNi high-entropy alloys using various filler metals for cryogenic applications

Cited by 37 publications

References 29 publications

Welding of high-entropy alloys and compositionally complex alloys—an overview

Welding of high-entropy alloys and compositionally complex alloys—an overview

A Short Review on Welding and Joining of High Entropy Alloys

Laser Beam Welding of Feconicrmn High-Entropy Alloys with Preplaced Powders

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