Extraordinary effect of the δ phase on the electrically-assisted deformation responses of a Ni-based superalloy

Zhang, Xin; Li, H.W.; Zhan, Mei; Shao, Guangda; Ma, Pengyu

doi:10.1016/j.matchar.2018.08.018

Cited by 33 publications

(2 citation statements)

References 31 publications

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“…Whereas, in fact, the nucleation sites of η-Ni 3 Ti precipitates must be some crystal defects (such as vacancy or interstitial atom). Thus, due to the higher resistivity of these crystal defects, the temperature around the nucleation sites will be higher than the measured values (295 and 393 • C) in the EPS + EPA sample [44]. In a word, even though the temperature of the whole samples are lower than the temperature of traditional peak aging regime, the temperature of nucleation area of η-Ni 3 Ti will be even more higher than the samples so that the precipitation of η-Ni 3 Ti still possesses sufficient thermal conditions.…”

Section: Optimization Of Aging Treatmentmentioning

confidence: 58%

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

Pan

Zhao

Wang

et al. 2019

Metals

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The ductility of cobalt-free maraging steel is unsatisfactory because of the high content of Ti. Traditional heat treatment can not effectively improve the ductility of this kind steel. In this contribution, high-energy electro-pulsing is adopted in a T250 steel to solve this problem efficiently. It is found that the EPS treatment (electro-pulsing treatment under water-cooling condition) can accelerate the formation of retained austenite and nano stacking faults. Meanwhile, the microstructure is also refined by EPS treatment. Then, taking the EPS sample as the initial state, nano-reverted austenite combined with finer η-Ni3Ti precipitates are formed during EPA treatment (electro-pulsing treatment under air-cooling condition), compared with TA (traditional aging) treatment. The results of mechanical properties indicate that the strength and elongation are both enhanced by electro-pulsing treatment. Consequently, the electro-pulsing treatment can be a promising technology to devise cobalt-free maraging steel with better properties.

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Section: Optimization Of Aging Treatmentmentioning

confidence: 58%

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

Pan

Zhao

Wang

et al. 2019

Metals

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“…Zhang and his team [75] uncovered a stress-softening occurrence through their investigation on the influence of electric-assisted deformation on nickel-based superalloys' a-phase, as depicted in Figure 4A. Their conclusion was that the localized Joule heat effect was responsible for this, as it encouraged both dislocation slip and dislocation recovery.…”

Section: Joule Heat Effectmentioning

confidence: 99%

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

Lu,

Tang,

et al. 2024

Alloys

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Residual stress is caused by non–uniform deformation caused by non–uniform force, heat and composition, which is of great significance in engineering applications. It is assumed that the residual stress is always the upper limit of the elastic limit, so the reduction of the flow stress will reduce the residual elastic stress. It is particularly important to control the flow stress in metal materials. Compared with traditional methods, the use of electropulsing treatment (EPT) technology stands out due to its energy–efficient, highly effective, straightforward and pollution–free characteristics. However, there are different opinions about the mechanism of reducing flow stress through EPT due to the conflation of the effects from pulsed currents. Herein, a clear correlation is identified between induced stress levels and the application of pulsed electrical current. It was found that the decrease in flow stress is positively correlated with the current density and the duration of electrical contact and current action time. We first systematically and comprehensively summarize the influence mechanisms of EPT on dislocations, phase, textures and recrystallization. An analysis of Joule heating, electron wind effect, and thermal–induced stress within metal frameworks under the influence of pulsed currents was conducted. And the distribution of electric, thermal and stress fields under EPT are discussed in detail based on a finite element simulation (FES). Finally, some new insights into the issues and challenges of flow stress drops caused by EPT are proposed, which is critically important for advancing related mechanism research and the revision of theories and models.

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Creep Characteristics and Fracture Mechanisms of a Ni‐Based Superalloy with δ Phases at Intermediate Temperatures

Lin

Yin

2020

Adv Eng Mater

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The creep and fracture characteristics of a Ni‐based superalloy with preprecipitated δ phases are researched at the intermediate temperatures (630–670 °C). The influences of external stress and temperature on the creep properties and rupture mechanisms are analyzed. It is observed that the creep rupture time decreases, whereas the minimum creep rate increases, as the creep temperature or external stress is raised. With raising the external stress, the failure pattern changes from the mixed intergranular/transgranular mode to the intergranular fracture. A Monkman–Grant (MG) model is established to characterize the relationship between the residual creep life and experimental parameters (external stress and temperature). The small error between the forecasted and measured residual creep life verifies that the established MG model can be applied to evaluate the creep life of the studied superalloy.

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Extraordinary effect of the δ phase on the electrically-assisted deformation responses of a Ni-based superalloy

Cited by 33 publications

References 31 publications

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

Creep Characteristics and Fracture Mechanisms of a Ni‐Based Superalloy with δ Phases at Intermediate Temperatures

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