Effect of thermal aging on mechanical properties of a bainitic forging steel for reactor pressure vessel

Xing, Ruisi; Yu, Dunji; Xie, Guobo; Yang, Zhihai; Wang, Xuxin; Chen, Xu

doi:10.1016/j.msea.2018.02.036

Cited by 27 publications

(4 citation statements)

References 25 publications

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“…The experimental temperature (−46 °C) was assumed to be in the ductile-to-brittle transition temperature (DBTT) range. Steels that had a similar composition to that of the steels in this experiment had DBTTs in the range of −25 °C to −100 °C, as in earlier investigations [ 9 , 16 , 30 , 57 , 58 , 59 ].…”

Section: Resultsmentioning

confidence: 72%

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Kang

Park

et al. 2020

Materials

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This study investigated the mechanical properties of steel in flanges, with the goal of obtaining high strength and high toughness. Quenching was applied alone or in combination with tempering at one of nine combinations of three temperatures TTEM and durations tTEM. Cooling rates at various flange locations during quenching were first estimated using finite element method simulation, and the three locations were selected for mechanical testing in terms of cooling rate. Microstructures of specimens were observed at each condition. Tensile test and hardness test were performed at room temperature, and a Charpy impact test was performed at −46 °C. All specimens had a multiphase microstructure composed of matrix and secondary phases, which decomposed under the various tempering conditions. Decrease in cooling rate (CR) during quenching caused reduction in hardness and strength but did not affect low-temperature toughness significantly. After tempering, hardness and strength were reduced and low-temperature toughness was increased. Microstructures and mechanical properties under the various tempering conditions and CRs during quenching were discussed. This work was based on the properties directly obtained from flanges under industrial processes and is thus expected to be useful for practical applications.

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Section: Resultsmentioning

confidence: 72%

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Kang

Park

et al. 2020

Materials

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“…The results suggest that the upper shelf decreased with the prolongation of thermal aging time, owing to the decrease of the energy absorption capability by plastic deformation. Meanwhile, the value of DBTT showed a more apparent increase after thermal aging at 500 °C, compared with thermal aging at 350 °C [14]. It can be concluded that higher thermal aging temperature accelerated the process of thermal aging causing more serious embrittlement.…”

Section: Resultsmentioning

confidence: 86%

“…6. The SEM micrographs of fractography with 350 ℃ thermal aging temperature originated from the literature [14]. The fractography contains three zones: initiation zone, early propagation zone and final propagation zone.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Impact Properties of 16MND5 Forgings for Nuclear Reactor Pressure Vessel during Thermal Aging at 500°C

Xing

2019

KEM

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Effects of thermal aging on tensile and Charpy impact properties in 16MND5 steel was investigated, which were aged at 500°C for 0 h, 1000 h, 3000 h, 5000 h. A significant decrease in the yield stress and ultimate tensile strength was observed after thermal aging, while the elongation exhibited a slight decrease follow by an increase aged for 5000 h. What's more, the ductile-to-brittle transition temperature (DBTT) showed a remarkable increase with the prolongation of thermal aging duration. These facts indicate thermal aging caused embrittlement of the steel, which was further investigated by microstructure observation of SEM. The results show cleavage fracture after thermal aging. Furthermore, experimental results at 350°C thermal aging temperature originated from the previous literature were used to analysis the effect of thermal aging temperature. Thus, thermal embrittlement should be taken seriously.

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“…As illustrated in Figure 11e, quite large MR value of 34.9% at 5T is found across the transformation. Figure 11f manifests the excellent mechanical properties of the annealed ribbon in contrast to some steel materials [63][64][65].…”

Section: Combination Of Doping and Reducing Materials Sizementioning

confidence: 96%

Magneto-Structural Transition and Refrigeration Property in All-D-Metal Heusler Alloys: A Critical Review

Zhang

Qian

Zhang

2022

J. Solar Eneg. Res. Updat.

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All-d-metal Heusler alloys has attracted much attention due to its unique magnetic properties, martensite transformation behavior and related solid-state refrigeration performance. These unique type alloys are recently discovered in 2015 and have been widely studied; however, systematic reviews on their magneto-structural transition and refrigeration property are rare. In this review, we first summarize the preparation techniques and microstructure of the bulk alloys and ribbons. Then the magnetic transition and martensite transformation behavior are reviewed, focusing on the correlation between magneto-structural transition and refrigeration properties. The effects of element doping, external magnetic and mechanical fields on the martensite transformation and corresponding magnetic entropy change are summarized. We end this review by proposing the further development prospective in the field of all-d-metal Heusler alloys.

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Effect of thermal aging on mechanical properties of a bainitic forging steel for reactor pressure vessel

Cited by 27 publications

References 25 publications

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Effects of Cooling Rate during Quenching and Tempering Conditions on Microstructures and Mechanical Properties of Carbon Steel Flange

Evolution of Impact Properties of 16MND5 Forgings for Nuclear Reactor Pressure Vessel during Thermal Aging at 500°C

Magneto-Structural Transition and Refrigeration Property in All-D-Metal Heusler Alloys: A Critical Review

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