Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Telang, Abhishek; Gill, Amrinder S.; Kumar, Mukul; Teysseyre, S.; Qian, Dong; Mannava, Seetha R.; Vasudevan, Vijay K.

doi:10.1016/j.actamat.2016.05.009

Cited by 66 publications

(30 citation statements)

References 43 publications

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“…[4][5][6][7][8][9][10] GBE is the process of introducing a specific type and density of GBs through thermomechanical processing (TMP) to improve a GB-dependent property. Previous studies have shown GBE to be a successful method in mitigating intergranular stress corrosion cracking, 11,12 IGC, 5,13,14 hydrogen embrittlement, 15 and grain growth. 16 GBE is typically associated with the increase in specific coincidence site lattice (CSL) GBs, which have been considered special boundaries.…”

Section: Introductionmentioning

confidence: 99%

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

et al. 2018

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Tailoring the grain boundary network is desired to improve grain boundary-dependent phenomena such as intergranular corrosion. An important grain boundary network descriptor in heavily twinned microstructures is the twin-related domain, a cluster of twinrelated grains. We indicate the advantages of using twin-related domains and subsequent statistics to provide new insight into how a grain boundary networks respond to intergranular corrosion in a heavily twinned grain boundary engineered 316L stainless steel. The results highlight that intergranular corrosion is typically arrested inside twin-related domains at coherent twins or low-angle grain boundaries. Isolated scenarios exist, however, where intergranular corrosion propagation persists in the grain boundary network through higher-order twin-related boundaries.

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Section: Introductionmentioning

confidence: 99%

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

et al. 2018

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“…More recently, studies on grain boundary engineering on Inconel 600 have also been tested with the DL−EPR. They have shown the improvement on Inconel 600 by thermo-mechanical treatments on the protection against intergranular corrosion [33][34][35]. In addition to the thermal treatments, mechanical processing such as cold work also use DL−EPR to assess the degree of sensitization of steels [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Martin

Ress

Bosch

et al. 2020

Metals

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In this work, influence of ultrasonic nanocrystal surface modification (UNSM) on the degree of sensitization (DOS) in Inconel 718 has been studied and correlated with the resulting microstructure. The UNSM processed samples decreased their grain size from 11.9 µm to 7.75 µm, increasing the surface of grain boundaries, and thus enhancing the area where δ phase and niobium carbides precipitate. The effect of the UNSM process on the DOS of Inconel 718 was studied by the double loop electrochemical potentiokinetic reactivation (DL−EPR) test. The DL−EPR showed that for UNSM processed samples with no thermal treatment, the DOS increased up to 59.6%, while for UNSM treated samples that were post-annealed at 1000 °C for 10 min and water quenched the DOS decreased down to 40.9%. The increase of grain boundaries surface area and triple junctions after the UNSM process enables the formation of twice the amount of δ phase compared to the as-received Inconel 718 bulk sample. The area fraction of the grain boundary covered by δ phase was of 9.87% in the UNSM region while in the bulk the area fraction was 4.09%. In summary, it was found that after UNSM process, the annealing at 1000 °C for 10 min and water quenching promoted the transformation of γ″ to form δ phase on the grain boundaries, which reduces the intergranular corrosion susceptibility.

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“…The improvement of resistance to intergranular failure of polycrystalline metallic materials has presented critical industry problems, such as intergranular corrosion (IGC) [1,2,3,4] and intergranular stress corrosion cracking (IGSCC) [5,6,7] as well as intergranular segregation/precipitation [8]. These problems are especially evident in austenitic stainless steels and Ni-based alloys exposed to light water reactor environments.…”

Section: Introductionmentioning

confidence: 99%

“…The synergistic effects of the corrosive condition and structural stress which are unavoidable due to the high temperature and high pressure water and the engineering structure caused these intergranular failures [9]. Grain boundary engineering (GBE) based on “grain boundary control and design”, which was first proposed by Watanabe in 1984 [10], has been demonstrated as a promising method to mitigate the intergranular degradation according to extensive investigations carried out in the last decades [1,2,3,4,5,6,7]. Instead of modifying the mechanics or chemistry [11], GBE provides a methodology to prevent intergranular degradation by control of the grain boundary (GB) network of materials, based on the idea that the percolation process of intergranular failure could be avoided if the proportion of corrosion-resistant boundaries was high enough in the GB network [1,12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Grain Boundary Network and Improvement of Intergranular Cracking Resistance in 316L Stainless Steel after Grain Boundary Engineering

et al. 2019

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For understanding the improvement of intergranular stress corrosion cracking (IGSCC) propagation in grain boundary engineering (GBE)-processed metals exposed to a simulated pressurized water reactor (PWR) environment, characteristics of the grain boundary network of 316L stainless steel before and after GBE were investigated and compared, including proportions both in length and in number of ∑3n boundaries, sizes, and topology of grain clusters (or twin-related domains), and connectivity of random boundaries. The term through-view random boundary path (TRBP) was proposed to evaluate the random boundary connectivity. A TRBP is a chain of end-to-end connected crack-susceptible boundaries that passes through the entire mapped microstructure. The work provides the following key findings: (I) the length fraction of ∑3n boundaries was increased to approximately 75% after GBE, but the number fraction was only approximately 50%; (II) a connected non-twin boundary network still existed in the GBE sample due to the formation of grain clusters; (III) the GBE sample exhibited a higher resistance to IGSCC; and (IV) as the twin boundary fraction increased, the number of TRBPs decreased and the normalized length of the minimum TRBP increased monotonically, leading to a higher resistance to IGSCC.

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Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Cited by 66 publications

References 43 publications

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Evaluation of Grain Boundary Network and Improvement of Intergranular Cracking Resistance in 316L Stainless Steel after Grain Boundary Engineering

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