Understanding and predicting stress corrosion cracking (SCC) in hot water

Andresen, Peter L.

doi:10.1016/b978-0-08-100049-6.00005-7

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Taking into account the results of the present study achieved using SE(T) specimens, this rate dependence requires knowledge about the plastic strain rate in the process zone at the crack tip. However, the assessment of the plastic strain rate at the crack tip is not straightforward since plastic deformation is strongly localized [86]. Hahn et al [87] Table 3 BDT temperatures, loading rates, and BDT activation energies.…”

Section: Evolution Of Bdt Arrhenius Activation Energiesmentioning

confidence: 99%

The brittle-to-ductile transition in cold-rolled tungsten sheets: the rate-limiting mechanism of plasticity controlling the BDT in ultrafine-grained tungsten

et al. 2020

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Conventionally produced tungsten (W) sheets are brittle at room temperature. In contrast to that, severe deformation by cold rolling transforms W into a material exhibiting room-temperature ductility with a brittle-to-ductile transition (BDT) temperature far below room temperature. For such ultrafine-grained (UFG) and dislocation-rich materials, the mechanism controlling the BDT is still the subject of ongoing debates. In order to identify the mechanism controlling the BDT in room-temperature ductile W sheets with UFG microstructure, we conducted campaigns of fracture toughness tests accompanied by a thermodynamic analysis deducing Arrhenius BDT activation energies. Here, we show that plastic deformation induced by rolling reduces the BDT temperature and also the BDT activation energy. A comparison of BDT activation energies with the trend of Gibbs energy of kink-pair formation revealed a strong correlation between both quantities. This demonstrates that out of the three basic processes, nucleation, glide, and annihilation, crack tip plasticity in UFG W is still controlled by the glide of dislocations. The glide is dictated by the mobility of the screw segments and therefore by the underlying process of kink-pair formation. Reflecting this result, a change of the rate-limiting mechanism for plasticity of UFG W seems unlikely, even at deformation temperatures well below room temperature. As a result, kink-pair formation controls the BDT in W over a wide range of microstructural length scales, from single crystals and coarse-grained specimens down to UFG microstructures.

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Section: Evolution Of Bdt Arrhenius Activation Energiesmentioning

confidence: 99%

The brittle-to-ductile transition in cold-rolled tungsten sheets: the rate-limiting mechanism of plasticity controlling the BDT in ultrafine-grained tungsten

et al. 2020

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“…A crucial physical property for extremely high-temperature environments is low thermal conductivity (k) [7]. However, this property makes INCONEL ® alloys a hard-to-machine-metal [10] and difficult-to-metal-shape substance, influencing heat distribution during machining and impacting the surface quality when employing conventional chip-start cu ing machining and surface treatment techniques [11]. Conventional manufacturing (CM) and the instantaneous work hardening in the chip formation region due to the creation of a surface with several porosities make INCONEL ® alloys prone to reduced low-cycle fatigue (LCF) strength [12] and corrosion, leading to faster oxidisation by ammonium chloride (NH4Cl) [13], H2 embri lement in electrolysis processes environments [14,15] and sulphuration corrosion failure [16].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the porosity induced by some INCONEL ® alloy processing also contributes to a significant decrease in toughness and fatigue resistance, facilitating crack generation and Figure 2 displays the temperature (T) dependence of compressive yield strength (σyc, Figure 2a) and the specific compressive strength (σyc/ρ, Figure 2b) of INCONEL ® 718 and the comparison with high-entropy alloys and two other Ni-based alloys. However, this property makes INCONEL ® alloys a hard-to-machine-metal [10] and difficult-to-metal-shape substance, influencing heat distribution during machining and impacting the surface quality when employing conventional chip-start cutting machining and surface treatment techniques [11]. Conventional manufacturing (CM) and the instantaneous work hardening in the chip formation region due to the creation of a surface with several porosities make INCONEL ® alloys prone to reduced low-cycle fatigue (LCF) strength [12] and corrosion, leading to faster oxidisation by ammonium chloride (NH4Cl) [13], H2 embrittlement in electrolysis processes environments [14,15] and sulphuration corrosion failure [16].…”

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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