Solidification of a Modified Inconel 625 Alloy under Different Cooling Rates

Tinoco, José; Fredriksson, Hasse

doi:10.1515/htmp.2004.23.1.13

Cited by 22 publications

(9 citation statements)

References 7 publications

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“…In the overall cases, significant segregation is present. In these zones, elements segregate outside the c dendrites' core and they form secondary phases such as Laves phases, carbides, nitrides and carbonitrides (Figure 7) 28,29 .…”

Section: Resultsmentioning

confidence: 99%

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Ni-Based CW6MC: Effect of the Internal Revert Recycle on the Soundness of the Alloy

2021

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The CW6MC alloy is a nickel-based alloy used to withstand acidic environments, especially in the oil and gas industry where it is used in the production of valves, impellers, and pipes. This alloy is the foundry counterpart of the best known A625 for plastic deformation. Regarding nickel-based alloys, a scrap market like that in the case of steel has not yet been established, therefore, especially in the case of foundries, scrap generally comes from internal recycling (casting waste, feeders, sprues, runners, etc.) to be certain of the origin and quality of the material. In this work, four castings with different percentage of recycled content (0%, 30%, 70%, 100%) were produced in accordance with the technical specifications and analysed to evaluate the effect of scrap on the final chemical composition, the microstructure, the mechanical properties and corrosion resistance. Following the analyses carried out, it was determined that the amount of acceptable scrap content (of those analysed) without compromising the material properties corresponds to 30%.

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Section: Resultsmentioning

confidence: 99%

“…Laves phases are present in the eutectic Laves-matrix structures and in the form of elongated shaped particles. Their typical formula is (Cr,Fe,Ni) 2 (Si,Ti,Nb,Mo) and they are rich in Nb 18,19,21,22,29 .…”

Section: Resultsmentioning

confidence: 99%

Ni-Based CW6MC: Effect of the Internal Revert Recycle on the Soundness of the Alloy

2021

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“…In order to determine the location-specific cracking susceptibility, the cooling rate in different regions needed to be identified. Therefore, the cooling rate was determined from the SDAS using the following relation determined for Inconel 625 by Tinoco et al [34]:…”

Section: Methodsmentioning

confidence: 99%

Determination of Location-Specific Solidification Cracking Susceptibility for a Mixed Dissimilar Alloy Processed by Wire-Arc Additive Manufacturing

Sridar

Sargent

Wang

et al. 2022

Metals

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Solidification cracking is a major obstacle when joining dissimilar alloys using additive manufacturing. In this work, location-specific solidification cracking susceptibility has been investigated using an integrated computational materials engineering (ICME) approach for a graded alloy formed by mixing P91 steel and Inconel 740H superalloy. An alloy mixture of 26 wt.% P91 and 74 wt.% Inconel 740H, with high configurational and total entropy, was fabricated using wire arc additive manufacturing. Microstructure characterization revealed intergranular solidification cracks in the FCC matrix, which increased in length along with the enrichment of Nb (~27 to 56 wt.%) and Cu (~87 wt.%) in the middle and top regions. DICTRA simulations to model location-specific solidification cracking susceptibility showed that the top region with the highest cooling rate (270 K/s) has the highest solidification cracking susceptibility in comparison with the middle and bottom regions. This is in good agreement with the experimentally observed varying crack length. From Scheil simulations, it was deduced that enrichment of Nb and Cu affected the solidification range as high as ~77%, in comparison with the matrix composition. The overall solidification cracking susceptibility and freezing range was highest for the 26 wt.% P91 alloy amongst the mixed compositions between P91 steel and 740H superalloy, proving that solidification characteristics play a major role in alloy design for additive manufacturing.

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“…According to the EDS result, there are Laves phase and MC carbide in the γ matrix. Due to the partitioning coefficient (k) being less than 1, the positive segregation elements, such as Nb, are prone to be segregated in the interdendritic areas where the precipitates are mainly distributed [28]. The precipitation of the Laves phase and TiN/NbC carbide was related to the ratio of the elements of niobium and carbon.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

On the Effect of Heat Input and Interpass Temperature on the Performance of Inconel 625 Alloy Deposited Using Wire Arc Additive Manufacturing–Cold Metal Transfer Process

Zhang

Qiu

Zhu

et al. 2021

Metals

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Relatively high heat input and heat accumulation are treated as critical challenges to affect the qualities and performances of components fabricated by wire arc additive manufacturing (WAAM). In this study, various heat inputs, namely 276, 552 and 828 J/mm, were performed to fabricate three thin-wall Inconel 625 structures by cold metal transfer (CMT)-based WAAM, respectively, and active interpass cooling was conducted to limit heat accumulation. The macrostructure, microstructure and mechanical properties of the produced components by CMT were investigated. It was found that the increased heat input can deteriorate surface roughness, and the size of dendrite arm spacing increases with increasing heat input, thus leading to the deterioration of mechanical properties. Lower heat input and application of active interpass cooling can be an effective method to refine microstructure and reduce anisotropy. This study enhances the understanding of interpass temperature control and the effectiveness of heat inputs for Inconel 625 alloy by WAAM. It also provides a valuable in situ process for microstructure and mechanical properties’ refinement of WAAM-fabricated alloys and the control of heat accumulation for the fabrication of large-sized structures for future practical applications.

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Solidification of a Modified Inconel 625 Alloy under Different Cooling Rates

Cited by 22 publications

References 7 publications

Ni-Based CW6MC: Effect of the Internal Revert Recycle on the Soundness of the Alloy

Ni-Based CW6MC: Effect of the Internal Revert Recycle on the Soundness of the Alloy

Determination of Location-Specific Solidification Cracking Susceptibility for a Mixed Dissimilar Alloy Processed by Wire-Arc Additive Manufacturing

On the Effect of Heat Input and Interpass Temperature on the Performance of Inconel 625 Alloy Deposited Using Wire Arc Additive Manufacturing–Cold Metal Transfer Process

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