Comparative study on the high temperature deformation behaviour of an as-cast Ni base superalloy subjected to different cooling rates after homogenization

Sahithya, K.; Balasundar, I.; Pant, Prita; Raghu, T.

doi:10.1016/j.jallcom.2020.156626

Cited by 16 publications

(3 citation statements)

References 63 publications

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“…With a decreasing cooling rate, a sequential morphological transition of γ ′ precipitates take place, that is, sphere to cube, cube to doublet or octet, and octet to platelets. 28 The formation of a cube to doublet/octet is called reverse coarsening, which is a well-established phenomenon in nickel-base superalloys. 29 Microstructure of AISI 4140 steel side SEM micrographs of AISI 4140 steel side (FP40) near WI are shown in Figure 6(a).…”

Section: Microstructure Of In713lc Superalloy Sidementioning

confidence: 99%

Microstructure evolution and mechanical properties of friction welded IN713LC and AISI 4140

Gaikwad,

Balasundar,

Tripathi

et al. 2024

Materials Science and Technology

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The microstructure and mechanical behavior of rotary friction-welded IN713LC nickel-base superalloy with AISI 4140 steel have been investigated. The microstructure of IN713LC changed from a columnar dendritic structure to equiaxed grains due to dynamic recrystallization with considerable change in in-grain misorientation, morphology, and volume fraction of gamma prime (γ′) precipitates. The observations indicate a counteracting effect of heat input and degree of deformation which resulted in achieving minimum grain size at an intermediate friction pressure. Phase transformation was observed in the weld interface/thermomechanically affected zone region of AISI 4140 steel. These changes in microstructure contribute to the variation in the microhardness across the weld joint. Furthermore, a maximum weld joint tensile strength of 922 MPa was observed at an intermediate friction pressure of 110 MPa.

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Section: Microstructure Of In713lc Superalloy Sidementioning

confidence: 99%

Microstructure evolution and mechanical properties of friction welded IN713LC and AISI 4140

Gaikwad,

Balasundar,

Tripathi

et al. 2024

Materials Science and Technology

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“…There are many literatures about the microstructure evolution mechanism of nickel-based superalloys during high temperature deformation, but most of them are deformed materials [11][12], and there are few researches on the microstructure evolution of as-cast materials during main hot working processes [13][14][15][16]. K. Sahithya et al [17] studied the effect of homogenization cooling rate on microstructure evolution [18]. However, few investigations have focused on effect of cooling rates on thermoplasticity during hot deformation in such a high γ' volume fraction containing alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of cooling rates on thermoplasticity during hot deformation for a new wrought superalloy

Jia

2023

J. Phys.: Conf. Ser.

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The effect of cooling rate on thermoplasticity of ni base superalloy GH4151 during thermal deformation was studied. Several different treatments were used to obtain γ′ phases of different sizes and shapes. The hot tensile and hot compression tests were carried out, and the microstructure was studied in detail by scanning electron microscopy and transmission electron microscopy to determine the microscopic mechanism. The results show that the volume fraction of large γ’ phase increased with decreasing cooling rate. The slowly cooled material exhibits lower resistance to deformation due to more obvious softening behavior. The sample with slow cooling contains coarse γ′ phase and broaden γ-γ’ channel. The locations around broaden γ-γ’ channel were accumulated during deformation, which caused a high level of stored energy, and thus dynamic recrystallization (DRX) is promoted, and obvious softening behavior was displayed.

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“…They are widely used in high-temperature components of heat exchangers, industrial furnaces, and gas turbines. [1,2] Al, Cr, Si, and other elements will have a great impact on the oxidation resistance of superalloys. When the addition amount of these elements in the alloy reaches a certain value, a protective oxide film will be formed on the alloy surface, which will improve the high-temperature oxidation resistance of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Influence of Al content and low oxygen pressure preoxidation on high‐temperature oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y alloys

Wang

Zhu

et al. 2022

Materials & Corrosion

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The influence of Al content and low oxygen pressure preoxidation on the high‐temperature oxidation resistance of the Ni–25Cr–xAl–1Si–0.5Y (x = 0, 1, 3, 5 wt%) alloys were studied. The formation of oxides in low oxygen pressure preoxidation was investigated. The oxidation behavior of alloys with different Al content at 1000°C with and without preoxidation under low oxygen pressure was discussed. A protective oxide film was formed on the surface of alloys with different Al content in low oxygen pressure pre‐oxidation at 950°C for 5 h, but there were great differences in microstructures and properties. With the increase of Al content, the outermost oxide film of the alloy gradually changed from continuous Cr2O3 to Al2O3, and the oxidation resistance of the alloy increased gradually at 1000°C. By comparison, the oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y (x = 0, 1, 3, 5 wt%) alloys can be significantly improved at 1000°C by low oxygen pressure preoxidation treatment.

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Comparative study on the high temperature deformation behaviour of an as-cast Ni base superalloy subjected to different cooling rates after homogenization

Cited by 16 publications

References 63 publications

Microstructure evolution and mechanical properties of friction welded IN713LC and AISI 4140

Microstructure evolution and mechanical properties of friction welded IN713LC and AISI 4140

Effect of cooling rates on thermoplasticity during hot deformation for a new wrought superalloy

Influence of Al content and low oxygen pressure preoxidation on high‐temperature oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y alloys

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