Design of Graded Transition Joints Through Thermodynamic and Kinetic Modeling

Galler, Jonathan P.; DuPont, J. N.; Babu, S. S.; Subramanian, Mohan

doi:10.1007/s11661-019-05186-0

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…In recent times such simulations are attempted by combining different thermodynamic databases with a common mobility database. [41][42][43] For example, in Fe-/Nibased DMJs, optimal length of compositionally graded interlayer to prevent carbon diffusion was predicted by combining MOB2 with TCFE7 and NIDATAV7 databases. [41] In another study, [42] origin of a ferrite band near partially melted regions at the interface of Ni-based filler and Grade 91 steel could be explored through simulation of carbon diffusion using MOB2, TCFE9 and TCNI8 databases.…”

Section: Introductionmentioning

confidence: 99%

“…[41][42][43] For example, in Fe-/Nibased DMJs, optimal length of compositionally graded interlayer to prevent carbon diffusion was predicted by combining MOB2 with TCFE7 and NIDATAV7 databases. [41] In another study, [42] origin of a ferrite band near partially melted regions at the interface of Ni-based filler and Grade 91 steel could be explored through simulation of carbon diffusion using MOB2, TCFE9 and TCNI8 databases. However, experimental confirmation was lacking for predicted l and r phases in addition to carbides.…”

Section: Introductionmentioning

confidence: 99%

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Interdiffusion Studies in Alloy 617 and 10Cr Steel Joints Using Diffusion Couple Approach and Simulations

Haribabu,

Sudha,

Ganesh

et al. 2024

J. Phase Equilib. Diffus.

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In the steam turbine circuit of advanced ultra supercritical power plants dissimilar joints of alloy 617 and 10Cr steel are unavoidable due to economic reasons. In these joints diffusional interaction causing change in microstructure is identified as possible reason for failure during service. To investigate the interdiffusion driven structural changes, alloy 617/10Cr steel diffusion couples were fabricated. To achieve good metallurgical bond between Fe- and Ni-based alloys and to study diffusional transformations under accelerated conditions, diffusion couples were prepared by annealing in the temperature range of 1000-1100 °C for 3-8 h. For all conditions heat treatment interaction zones were wider in alloy 617 (150-200 μm at 1050 °C, 8 h) than in 10Cr steel (15-16 μm at 1050 °C, 8 h) and the phase stability at the interface was studied using electron microprobe and x-ray diffraction. Average effective interdiffusion coefficients were calculated using Dayananda’s approach. While the diffusivities of substitutional solutes were similar in alloy 617 (0.31-0.42 × 10−15 m2/s at 1050 °C), they differed in 10Cr steel in the following sequence: $$\tilde{D}_{{{\text{Cr}}}}$$ D ~ Cr > $$\tilde{D}_{{{\text{Fe}}}}$$ D ~ Fe ≈$$\tilde{D}_{{{\text{Ni}}}}$$ D ~ Ni > $$\tilde{D}_{{{\text{Co}}}}.$$ D ~ Co . Further, multicomponent interdiffusion profiles were predicted using homogenization model in DICTRA and an integrated approach combining DICTRA with Thermo-Calc helped in understanding the experimental observations on the interface microstructure.

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Section: Introductionmentioning

confidence: 99%