Enhancement of tensile properties applying phase separation with Cu addition in gas tungsten arc welds of CoCrFeMnNi high entropy alloys

Nam, Hyunbin; Park, Hyesung; Kim, Seong-Woong; Shim, Sang Hun; Na, Young Sang; Kim, Nam-Kyu; Song, Sangwoo; Hong, Sun Ig; Kang, Ning

doi:10.1016/j.scriptamat.2022.114897

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…Typically, the Cu-rich FCC phase, having the same crystal structure but a different lattice parameter compared to the primary FCC, would result in a double peak in the XRD pattern (that is, separation into secondary FCC). In addition, despite the positive mixing enthalpy of Cu and the anticipated clarity of the double peak with increasing PWHT temperature, no distinct double peaks were observed in the WZ, even at a PWHT temperature of 900 °C [9,23,26]. Figure 4 depicts the elemental maps of WZ at various PWHT temperatures, with the WZ exhibiting a dendritic microstructure.…”

Section: Effect Of 1 At % Cu On the Microstructural Behaviour In The ...mentioning

confidence: 99%

“…Several studies have highlighted the beneficial effects of a Cu-rich phase in delaying atomic diffusion and producing a fine microstructure, thereby improving the mechanical properties [ 23 ]. Moreover, the Cu-rich phase exhibits higher Vickers hardness than the primary FCC phase, hindering dislocation movement [ 26 , 27 ]. These phenomena have a strengthening effect, improving the overall performance of the weldments.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Microstructural and Mechanical Properties of Ferrous Medium-Entropy Alloy through Cu Addition and Post-Weld Heat Treatment in Gas Tungsten Arc Welding

Yoo,

Lee,

Choi

et al. 2023

Materials

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This study investigates the impact of a high-entropy alloy filler metal coated with copper (Cu) and post-weld heat treatment (PWHT) on the weldability of a ferrous medium-entropy alloy (MEA) in gas tungsten arc welding. The addition of 1-at% Cu had an insignificant effect on the microstructural behaviour, despite a positive mixing enthalpy with other elements. It was observed that a small amount of Cu was insufficient to induce phase separation into the Cu-rich phase and refine the microstructure of the as-welded specimen. However, with an increase in the PWHT temperature, the tensile strength remained mostly consistent, while the elongation significantly increased (elongation of as welded, PWHT700, PWHT800, and PWHT 900 were 19, 43, 55 and 68%, respectively). Notably, the PWHT temperature of 900 °C yielded the most desirable results by shifting the fracture location from the coarse-grained heat-affected zone (CGHAZ) to base metal (BM). This was due to significant recrystallisation and homogenised hardness of the cold-rolled BM during PWHT. However, the CGHAZ with coarse grains induced by the welding heat input remained invariant during the PWHT. This study proposes a viable PHWT temperature (900 °C) for enhancing the weldability of cold-rolled ferrous MEA without additional process.

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Section: Effect Of 1 At % Cu On the Microstructural Behaviour In The ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Microstructural and Mechanical Properties of Ferrous Medium-Entropy Alloy through Cu Addition and Post-Weld Heat Treatment in Gas Tungsten Arc Welding

Yoo,

Lee,

Choi

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…For such, welding has been widely used to address the increasing interest in exploring the processability phenomena arising from the high temperature/pressure required to achieve strong and permanent joints in similar and dissimilar combinations. [10][11][12][13][14][15][16][17][18][19] Among these studies, gas tungsten arc welding (GTAW) of the CoCrFeMnNi high entropy alloy on the as-rolled condition was performed by Oliveira et al 12 and stands as the basis of the present paper. There, the excellent weldability of the CoCrFeMnNi system was highlighted by means of advanced microstructure and mechanical characterization.…”

mentioning

confidence: 99%

In-situ microstructural evolution during tensile loading of CoCrFeMnNi high entropy alloy welded joint probed by high energy synchrotron X-ray diffraction

Dias,

Lopes,

Curado

et al. 2024

Science and Technology of Welding and Joining

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The research regarding high entropy alloys (HEAs) has proved them to be suitable for engineering applications. Nevertheless, assessing their processability is key for industrial deployment. Of special relevance in terms of processing techniques arised welding. In this work, Gas Tungsten Arc Welding (GTAW) was chosen as a processing method to attest for the suitability of the equiatomic CoCrFeMnNi HEA for one of the most common real-world mechanical solicitations, tensile loading. We delve into an in-situ synchrotron X-ray diffraction analysis of the mechanical behavior of a high-performing GTAW CoCrFeMnNi HEA joint. Local analysis of the microstructure evolution, considering the base material, heat affected zone and fusion zone, was performed by tracking changes in the diffracted intensity and lattice strain. Orientation-dependent evolution is highlighted by considering partial azimuthal integration detailing texture impact across the joint. Evidence of strain concentration at specific locations is correlated with the microstructure and overall macroscopic mechanical behavior.

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Welding and Joining of Novel Materials

Goud,

Deshmukh,

Jain

et al. 2024

Automation in Welding Industry

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Enhancement of tensile properties applying phase separation with Cu addition in gas tungsten arc welds of CoCrFeMnNi high entropy alloys

Cited by 18 publications

References 22 publications

Enhancing Microstructural and Mechanical Properties of Ferrous Medium-Entropy Alloy through Cu Addition and Post-Weld Heat Treatment in Gas Tungsten Arc Welding

Enhancing Microstructural and Mechanical Properties of Ferrous Medium-Entropy Alloy through Cu Addition and Post-Weld Heat Treatment in Gas Tungsten Arc Welding

In-situ microstructural evolution during tensile loading of CoCrFeMnNi high entropy alloy welded joint probed by high energy synchrotron X-ray diffraction

Welding and Joining of Novel Materials

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