The oxidation behavior of three different zones of welded Incoloy 800H alloy

Chen, W.S.; Kai, Wu; Tsay, L.W.; Jia, Kai

doi:10.1016/j.nucengdes.2014.01.022

Cited by 17 publications

(3 citation statements)

References 12 publications

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“…An oxide surface-connected precipitates crack occurred because the intergranular precipitates reacted with the oxygen ions during high temperature exposure and easily diffused with the Cr-depleted zone. These observations are identical to what has been reported in the literature [12]. When the oxide outer layer formed and connected to the oxidized intergranular precipitates, the cohesive force weakened and initiated the crack.…”

Section: Fracture Micrographssupporting

confidence: 92%

Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C

Dewa

Kim

2018

Metals

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Alloy 800H is currently under consideration to be used in a very high temperature reactor system. This paper describes the experimental low-cycle fatigue study on Alloy 800H base metal and weldments in the air with fully-reversed strain control at 700 °C. The recommended modern Alloy 800H weldments were fabricated by gas tungsten arc welding. The observed fatigue life is found to be comparable between base metal and weldments at this temperature, indicating the welding technique can compete with base material. The influence of hold time was further investigated at the maximum tensile strain of 0.6% total strain range condition for 60 s, and it is found to reduce the fatigue life. For most of the tests, the base metal revealed an initial cyclic hardening stress response, otherwise, the weldment was entirely softened with cycles. The addition of hold time is also found to induce an unequal cyclic stress response in both materials. Accordingly, for continuous low-cycle fatigue tests, fatigue cracks were initiated and propagated in a classical transgranular fracture mode. However, the hold time affected the mixed-mode fracture mode by means of a transition from transgranular to intergranular fracture.

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Section: Fracture Micrographssupporting

confidence: 92%

Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C

Dewa

Kim

2018

Metals

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“…Further research on this oxidation behavior, along with its mechanisms, in the vicinity of three different zones (containing the substrate, heat-effected zone and the melt zone) in dry and wet air conditions was conducted [2]. The results showed that the oxidation kinetics of three different zones followed the parabolic-rate law in dry and wet air.…”

Section: Introductionmentioning

confidence: 98%

Continuous Casting of Incoloy800H Superalloy Billet under an Alternating Electromagnetic Field

Wang

Zhang

Deng

et al. 2015

Metals

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Abstract:We experimentally investigate the influence of an alternating electromagnetic field on the surface and internal qualities of Incoloy800H superalloy billets. The electromagnetic continuous casting experiments for Incoloy800H superalloy were successfully conducted and the billets (0.1 mˆ0.1 mˆ1.2 m) were obtained. We figure out that the high frequency (20.4 kHz) electromagnetic field which is applied in the mould region can improve the surface quality of Incoloy800H superalloy billet remarkably; the depth of oscillation mark decreases from 1.2 mm (without electromagnetic field) to 0.3 mm (with electromagnetic field). The internal quality of the billet was studied using a variety of characterization techniques. The low frequency (5 Hz) electromagnetic field which is applied in the second cooling region can improve the internal quality; the region of the equiaxed grain increases from 2.45% (without electromagnetic field) to 41.45% (with electromagnetic field). Furthermore, macro-and micro-segregation are suppressed and the TiN inclusion number is decreased as well.

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“…Moreover, the nature of the treatment activities also resulted in the release of VOCs into the atmosphere as agitation increased the exposure of the water to the air and to surface volatilization, especially in an open pond. [50][51][52].…”

Section: Source Contributionmentioning

confidence: 99%

Comprehensive Evaluation of Odor-Causing VOCs from the Painting Process of the Automobile Manufacturing Industry and Its Sustainable Management

et al. 2022

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Automotive manufacturing is one of the potential sources of air pollution particularly involving volatile organic compounds (VOCs). This study intensively evaluated VOC emissions and their dispersion from the industry. The measured VOCs were speciated for further evaluation of their odor threats according to the characteristics of each compound. Mathematical emission and air dispersion models were applied to assist in elaborating the source–receptor relationship allowing the determining of existing business-as-usual conditions with proposed mitigation measures to manage the pollution of the factory studied in this paper. Seven VOC species potentially caused odor problems to the surrounding community, including 1-butanol, ethyl benzene, toluene, m,p xylene, o xylene, methyl ethyl ketone, and methyl isobutyl ketone. The results from the AERMOD dispersion model revealed that the smell from these chemicals could reach up to about 800 m from the source. Analysis of mitigation measures indicated that two interesting scenarios should be considered according to their effectiveness. The concentrations of VOCs can decrease by up to 4.7, 14.0 and 24.9% from increasing the physical stack height by +1, +3 and +5 m from its existing height, respectively. Modification of the aeration tank of the wastewater treatment unit to a closed system also helped to reduce about 27.8% of emissions resulting in about a 27.6% decreased ambient air concentration. This study provided useful information on the characteristics of VOCs emitted by the automobile manufacturing industry. It also demonstrated the relevant procedures and highlights the necessity to comprehensively analyze the source–receptor relationship to evaluate the most appropriate measures in managing industrial air pollution.

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The oxidation behavior of three different zones of welded Incoloy 800H alloy

Cited by 17 publications

References 12 publications

Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C

Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C

Continuous Casting of Incoloy800H Superalloy Billet under an Alternating Electromagnetic Field

Comprehensive Evaluation of Odor-Causing VOCs from the Painting Process of the Automobile Manufacturing Industry and Its Sustainable Management

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