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article
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gold
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인용수 6·
2024Effects of (Ti, Mo)C precipitation on the microstructure, impact toughness, and sulfide stress corrosion cracking resistance of linepipe steels
Seoyoon Gong, Samuel Chao Voon Lim, Kyu-Tae Kim, Yong-Jae Yu, S. Shin
Journal of Materials Research and Technology
There is a growing need to develop high-performance linepipes owing to the accelerated resource depletion attributable to the increasing interest in mining in extreme environments. (Ti, Mo)C precipitation can help secure the strength, low-temperature toughness, and sulfide stress corrosion cracking (SSCC) resistance required for linepipes. In this study, high-strength low-alloy (HSLA) steels with (Ti, Mo)C precipitation and without Ti and Mo were fabricated to analyze the effects of (Ti, Mo)C precipitation on the microstructure, impact toughness, and SSCC resistance of linepipes. The (Ti, Mo)C precipitation behavior varied and caused differences in the phase fraction, grain size, and dislocation density. Such differences in the microstructure improved the strength and low-temperature impact toughness. The SSCC resistance was significantly improved. In conclusion, (Ti, Mo)C precipitation has the potential to improve the properties required for fabricating linepipes.
https://doi.org/10.1016/j.jmrt.2024.12.071
Materials science
Microstructure
Metallurgy
Stress corrosion cracking
Corrosion
Precipitation
Toughness
Sulfide
Environmental stress cracking
Cracking
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인용수 47
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2021Mechanical performance of additively manufactured austenitic 316L stainless steel
Kyu-Tae Kim
IF 2.817 (2021)
Nuclear Engineering and Technology
For tensile tests, Vickers hardness tests and microstructure tests, plate-type and box-type specimens of austenitic 316L stainless steels were produced by a conventional machining (CM) process as well as two additive manufacturing processes such as direct metal laser sintering (DMLS) and direct metal tooling (DMT). The specimens were irradiated up to a fast neutron fluence of 3.3 × 109 n/cm2 at a neutron irradiation facility. Mechanical performance of the unirradiated and irradiated specimens were investigated at room temperature and 300 °C, respectively. The tensile strengths of the DMLS, DMT and CM 316L specimens are in descending order but the elongations are in reverse order, regardless of irradiation and temperature. The ratio of Vickers hardness to ultimate tensile strength was derived to be between 3.21 and 4.01. The additive manufacturing processes exhibit suitable mechanical performance, comparing the tensile strengths and elongations of the conventional machining process.
https://doi.org/10.1016/j.net.2021.07.041
Ultimate tensile strength
Materials science
Machining
Austenite
Microstructure
Austenitic stainless steel
Metallurgy
Vickers hardness test
Irradiation
Direct metal laser sintering
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인용수 1
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2020The effect of peak cladding temperature occurring during interim-dry storage on transport-induced cladding embrittlement
Kyu-Tae Kim
IF 2.341 (2020)
Nuclear Engineering and Technology
To evaluate transport-induced cladding embrittlement after interim-dry storage, ring compression tests were carried out at room temperature(RT) and 135 °C. The ring compression test specimens were prepared by simulating the interim-dry storage conditions that include four peak cladding temperatures of 250, 300, 350 and 400 °C, two tensile hoop stresses of 80 and 100 MPa, two hydrogen contents of 250 and 500 wt.ppm-H and a cooling rate of 0.3 °C/min. Radial hydride fractions of the ring specimens vary depending on those interim-dry storage conditions. The RT compression tests generated lower offset strains than the 135 °C ones. In addition, the RT and 135 °C compression tests indicate that a higher peak cladding temperature, a higher tensile hoop stress and the lower hydrogen content generated a lower offset strain. Based on the embrittlement criterion of 2.0% offset strain, an allowable peak temperature during the interim-dry storage may be proposed to be less than 350 °C under the tensile hoop stress of 80 MPa at the terminal cool-down temperature of 135 °C.
https://doi.org/10.1016/j.net.2019.12.030
Materials science
Cladding (metalworking)
Embrittlement
Composite material
Ultimate tensile strength
Consolidation (business)
Hydrogen
Metallurgy
Chemistry