Laser dissimilar welding of CoCrFeMnNi-high entropy alloy and duplex stainless steel

Adomako, Nana Kwabena; Shin, Gi-Seung; Park, Nokeun; Park, Kyoung-Tae; Kim, Jeoung Han

doi:10.1016/j.jmst.2021.02.003

Cited by 59 publications

(20 citation statements)

References 38 publications

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“…As the continuous diffusing-into of Fe, the Al 13 Fe 4 phase is gradually replaced by the Fe-rich Al 5 Fe 2 phase. Most studies have shown that the dominant phase obtained during Fe/ Al solid/solid interdiffusion is the Al 5 Fe 2 phase, and occasionally, a thin Al 13 Fe 4 layer was found between the Al 5 Fe 2 [41]. In the current study, the initially formed Al 13 Fe 4 phase was completely replaced by the Al 5 Fe 2 phase due to the high processing temperature and extended length of holding time.…”

Section: Microstructure Of the Fe/al And Cocrfemnni/al Interfacementioning

confidence: 45%

“…In this study, as the first trial, we assessed the potential to use the quinary "Cantor's alloy" [39][40][41][42] (equiatomic CoCrFeMnNi alloy) as the "interlayer" through extensive characterizations of the nature of the CoCrFeMnNi/Fe and the CoCrFeMnNi/Al solid/solid interfaces. The microstructure of the CoCrFeMnNi/Fe metallurgical bonding interface when CoCrFeMnNi was coated on the Fe substrate was firstly reported.…”

Section: Introductionmentioning

confidence: 99%

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Nature of CoCrFeMnNi/Fe and CoCrFeMnNi/Al Solid/Solid Interface

Zhang

2021

Acta Metall. Sin. (Engl. Lett.)

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To shed light into the application potential of high-entropy alloys as “interlayer” materials for Al-steel solid-state joining, we investigated the nature of the CoCrFeMnNi/Fe and CoCrFeMnNi/Al solid/solid interfaces, focusing on the bonding behavior and phase components. Good metallurgical bonding without the formation of hard and brittle IMC can be achieved for CoCrFeMnNi/Fe solid/solid interface. In contrast to the formation of Al5Fe2 phase at the Fe/Al interface, Al13Fe4-type IMC, in which the Fe site is co-occupied equally by Co, Cr, Fe, Mn and Ni, dominates the CoCrFeMnNi/Al interface. Although the formation of IMC at the CoCrFeMnNi/Al interface is not avoidable, the thickness and hardness of the Al13(CoCrFeMnNi)4 phase formed at the CoCrFeMnNi/Al interface are significantly lower than the Al5Fe2 phase formed at the Fe/Al interface. The activation energies for the interdiffusion of Fe/Al and CoCrFeMnNi/Al static diffusion couple are 341.6 kJ/mol and 329.5 kJ/mol, respectively. Despite this similarity, under identical static annealing condition, the interdiffusion coefficient of the CoCrFeMnNi/Al diffusion couple is significantly lower than that of the Fe/Al diffusion couple. This is thus mainly a result of the reduced atomic mobility/diffusivity caused by the compositional complexity in CoCrFeMnNi high-entropy alloy.

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Section: Microstructure Of the Fe/al And Cocrfemnni/al Interfacementioning

confidence: 45%

Section: Introductionmentioning

confidence: 99%

Nature of CoCrFeMnNi/Fe and CoCrFeMnNi/Al Solid/Solid Interface

Zhang

2021

Acta Metall. Sin. (Engl. Lett.)

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“…However, they reported that tensile specimens after PWHT failed at the weld center due to the larger grain size. Adomako et al [ 88 ] revealed requirements for dissimilar metal welding for different structural applications in nuclear and aerospace industries. To demonstrate this, the authors performed LBW of CoCrFeMnNi with duplex stainless steel (DSS).…”

Section: Fusion Welding Techniques For Heasmentioning

confidence: 99%

Welding Techniques for High Entropy Alloys: Processes, Properties, Characterization, and Challenges

et al. 2022

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High entropy alloys (HEAs) are the outstanding innovations in materials science and engineering in the early 21st century. HEAs consist of multiple elements with equiatomic or near equiatomic compositions, which exhibit superior mechanical properties, such as wear resistance, fatigue resistance, and corrosion resistance. HEAs are primarily used in structural and functional applications; hence, appropriate welding processes are essential to enhancing the performances and service lives of HEA components. Herein, a comprehensive overview of current state-of-art-of welding techniques for HEAs is elucidated. More specifically, the article discusses the fusion-based welding techniques, such as gas tungsten arc welding (GTAW) and laser beam welding (LBW), and solid-state welding techniques, such as friction stir welding (FSW) and explosive welding (EB), for a broad category of HEAs. In addition, the microstructural features and mechanical properties of HEAs welded using different techniques were explained for a broad spectrum of HEAs. Finally, this review discusses potential challenges in the welding of HEAs.

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“…A hybrid structure comprising Ti-6Al-4V and 17-4PH could, therefore, balance the economic and quality aspects for structural applications [3][4][5]. The formation of such an hybrid structure or dissimilar joint involves using (i) a fusion welding process such as laser and electron beam welding and (ii) solid-state welding, including diffusion bonding, friction welding, and explosive welding [6][7][8][9]. However, these techniques are restricted in terms of their capability to fabricate dissimilar parts or structures with complex geometries.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Residual Stress at Joint Interface of Titanium Alloy and 17-4PH Stainless Steel

Adomako

Kim

Yoon³

et al. 2021

Metals

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Residual stress is a crucial element in determining the integrity of parts and lifetime of additively manufactured structures. In stainless steel and Ti-6Al-4V fabricated joints, residual stress causes cracking and delamination of the brittle intermetallic joint interface. Knowledge of the degree of residual stress at the joint interface is, therefore, important; however, the available information is limited owing to the joint’s brittle nature and its high failure susceptibility. In this study, the residual stress distribution during the deposition of 17-4PH stainless steel on Ti-6Al-4V alloy was predicted using Simufact additive software based on the finite element modeling technique. A sharp stress gradient was revealed at the joint interface, with compressive stress on the Ti-6Al-4V side and tensile stress on the 17-4PH side. This distribution is attributed to the large difference in the coefficients of thermal expansion of the two metals. The 17-4PH side exhibited maximum equivalent stress of 500 MPa, which was twice that of the Ti-6Al-4V side (240 MPa). This showed good correlation with the thermal residual stress calculations of the alloys. The thermal history predicted via simulation at the joint interface was within the temperature range of 368–477 °C and was highly congruent with that obtained in the actual experiment, approximately 300–450 °C. In the actual experiment, joint delamination occurred, ascribable to the residual stress accumulation and multiple additive manufacturing (AM) thermal cycles on the brittle FeTi and Fe2Ti intermetallic joint interface. The build deflected to the side at an angle of 0.708° after the simulation. This study could serve as a valid reference for engineers to understand the residual stress development in 17-4PH and Ti-6Al-4V joints fabricated with AM.

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Laser dissimilar welding of CoCrFeMnNi-high entropy alloy and duplex stainless steel

Cited by 59 publications

References 38 publications

Nature of CoCrFeMnNi/Fe and CoCrFeMnNi/Al Solid/Solid Interface

Nature of CoCrFeMnNi/Fe and CoCrFeMnNi/Al Solid/Solid Interface

Welding Techniques for High Entropy Alloys: Processes, Properties, Characterization, and Challenges

Finite Element Modeling of Residual Stress at Joint Interface of Titanium Alloy and 17-4PH Stainless Steel

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