Influence of heat treatment on Inconel 625 superalloy sheet: carbides, γ'', δ phase precipitation and tensile deformation behavior

Li, Xudong; Fan, Jiangkun; Zhang, Peizhe; Cao, Kai; Wang, Zixiao; Chen, Fulong; Liu, Degui; Tang, Bin; Kou, Hongchao; Li, Jinshan

doi:10.1016/j.jallcom.2022.167522

Cited by 31 publications

(16 citation statements)

References 40 publications

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“…At 732 °C, such undesired precipitation phenomenon occurs very quickly and the reduction in corrosion resistance becomes critical much earlier than the onset of 𝛾𝛾 ′′ precipitation, which represents the primary hardening phase. In fact, as confirmed by the experimental results and the literature [15], the hardening effect of the intergranular carbides is very poor and the effect of sensitization is predominant. At 621 °C, the precipitation of intergranular M23C6 carbides is obtained only after very long exposures.…”

Section: Resultssupporting

confidence: 68%

“…According to the TTP curves, at these aging temperatures, the formation of intergranular M23C6 carbides can occur together with the intermetallic hardening 𝛾𝛾 ′′ precipitates. However, compared to the 𝛾𝛾 ′′ phase, the hardening effect of the M23C6 carbides is negligible [15]. The simultaneous formation of Cr-rich M23C6 carbides was deeply investigated by EDXS analyses performed by scanning electron microscopy.…”

Section: Resultsmentioning

confidence: 99%

“…The time-temperatureprecipitation (TTP) diagram of this alloy is shown in Figure 1 [10]. The precipitate phases reported in the literature for this alloy are MC, M6C and M23C6 metal carbides, intermetallic phases, normally 𝛾𝛾 ′′ , 𝛿𝛿 and Laves [10,14,15]. The precipitation of intergranular carbides and intermetallic phases induces sensitization, reduction of toughness and deformability.…”

Section: Introductionmentioning

confidence: 93%

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Influence of Single- and Double-Aging Treatments on the Mechanical and Corrosion Resistance of Alloy 625

Rivolta,

Gerosa,

Panzeri

2024

Preprint

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The nickel-chromium-molybdenum alloy 625 exhibits an excellent combination of mechanical properties and corrosion resistance. However, the high temperature plastic deformation process and the heat treatment represent critical aspects and the adoption of non-optimal parameters can result in excessive grain coarsening and loss in mechanical strength. This detrimental behavior is worsened by the presence of a narrow region of temperatures and strain rates for complete recrystallization and the absence of phase transformation temperatures. In this alloy, the presence of sufficient amounts of niobium, titanium and aluminum permits slow age-hardening response upon single-aging treatments. Therefore, when the soft- or solution-annealed condition is associated with insufficient mechanical properties, this potentiality can be exploited to improve the mechanical strength and prevent waste of material and resources. Since the precipitation kinetic of the hardening γ^'' phase can be accelerated by prior nucleation treatment, different time-temperature combinations of double aging at 732 °C and 621 °C are investigated to reduce the overall heat treatment time. However, the simultaneous formation of Cr-rich carbides can dramatically affect the intergranular corrosion resistance. For this reason, a performance map is developed to compare all the tested conditions and identify the best compromise in terms of mechanical strength and corrosion rate.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Influence of Single- and Double-Aging Treatments on the Mechanical and Corrosion Resistance of Alloy 625

Rivolta,

Gerosa,

Panzeri

2024

Preprint

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“…The results show that these elements have a high tendency to segregate to the grain boundary, which is beneficial to the formation of liquid phase on the grain boundary in the melting process. However, the presence of carbides generally reduces the strength of the alloy, thereby initiating premature failure [ 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

A Comparison of the Microstructure, Mechanical Properties, and Corrosion Resistance of the K213 Superalloy after Conventional Casting and Selective Laser Melting

Wang

Sui

et al. 2023

Materials

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K213 superalloy was fabricated by conventional casting and selective laser melting (SLM). The microstructures of the two samples were examined, and the mechanical properties and corrosion resistance of these two kinds of K213 alloy were comparatively studied. The results show that segregation of Ti occurs at the grain boundaries of the as-cast alloy, resulting in the formation of MC carbide. Many microcracks were formed in the SLM sample. Premature fracture of the as-cast alloy is caused by the precipitation of the harmful phase (Ti, Mo, Nb)C (MC). The MC carbides and microcracks in the as-cast and SLM alloys, respectively, induce tensile fracture. In comparison, the strength of the SLM sample is greater, while the elongation of the as-cast sample is greater. The oxidation resistance of the SLM sample is better at a high temperature of 800 °C. This is due to the relatively uniform composition and microstructure of the SLM alloy. However, the corrosion rate of the SLM alloy is accelerated during the electrochemical immersion corrosion process due to the existence of microcracks.

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“…Being one of the most representative-strengthening Ni-superalloys, INCONEL ® 718 has a face-centred cubic (FCC) γ matrix, having as main precipitations the gamma prime phase (γ’, primary strengthening phase in Ni-based superalloy with an ordered L 12 FCC crystal structure [ 2 ]) Ni 3 (Al, Ti, Nb) and the double gamma phase (γ”, the main strengthening phase in INCONEL ® 718 with ordered D022 Body-Centred Tetragonal, BCT, structure [ 2 ]) Ni 3 Nb [ 3 , 4 ]. On the other hand, INCONEL ® 625 has a different solid solution hardening with Nb and Mo within the Ni-Cr matrix [ 5 ]. Figure 1 presents the different elastoplastic behaviours between INCONEL ® 718 and 625.…”

Section: Introductionmentioning

confidence: 99%

An In-Depth Exploration of Unconventional Machining Techniques for INCONEL® Alloys

Pedroso,

Sebbe,

Silva

et al. 2024

Materials

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Build-up-edge (BUE), high-temperature machining and tool wear (TW) are some of the problems associated with difficult-to-machine materials for high-temperature applications, contributing significantly to high-cost manufacturing and poor tool life (TL) management. A detailed review of non-traditional machining processes that ease the machinability of INCONEL®, decrease manufacturing costs and suppress assembly complications is thus of paramount significance. Progress taken within the field of INCONEL® non-conventional processes from 2016 to 2023, the most recent solutions found in the industry, and the prospects from researchers have been analysed and presented. In ensuing research, it was quickly noticeable that some techniques are yet to be intensely exploited. Non-conventional INCONEL® machining processes have characteristics that can effectively increase the mechanical properties of the produced components without tool-workpiece contact, posing significant advantages over traditional manufacturing.

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Influence of heat treatment on Inconel 625 superalloy sheet: carbides, γ'', δ phase precipitation and tensile deformation behavior

Cited by 31 publications

References 40 publications

Influence of Single- and Double-Aging Treatments on the Mechanical and Corrosion Resistance of Alloy 625

Influence of Single- and Double-Aging Treatments on the Mechanical and Corrosion Resistance of Alloy 625

A Comparison of the Microstructure, Mechanical Properties, and Corrosion Resistance of the K213 Superalloy after Conventional Casting and Selective Laser Melting

An In-Depth Exploration of Unconventional Machining Techniques for INCONEL® Alloys

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