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- 저자 : Hongwei Niu (검색결과 3 건)
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Lu Wang,Xia Li,Hongwei Niu,Lin Yang,Mingqin Xu, Jiaojiao Yi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
Cr was used to replace Nb, Ti, and Zr in a precursor alloy HfMoNbTiZr, and its effect on the microstructure, phase constitution,and mechanical properties of the newly formed alloys were investigated. Microstructural evolutions revealed thata cubic Laves phase emerged regardless of which element was substituted by Cr. The original single-phase BCC structureof the precursor alloy was thus deteriorated and replaced by two BCC and one cubic Laves phases. The formation of theLaves phase and BCC phases increased the strength to 2480 ± 40 MPa in the HfMoNbTiCr alloy, while the net-like structure(Laves phase) impeded the crack extension and compensated for the decreased plasticity due to the introduction of thebrittle-stiff Laves phase. The other two alloys, HfMoTiZrCr and HfMoNbZrCr, possessed lower strengths of 1400 ± 20 and1642 ± 23 MPa and exhibited a completely brittle fracture character, which was attributed to the high volume fraction andthe morphologies of the Laves phase.
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Study on Microstructure and Mechanical Properties of CrCuFeNiV Multi Principal Element Alloy
Lu Wang,Zhengzhong Feng,Hongwei Niu,Qi Gao,Mingqin Xu,Lin Yang,Jiaojiao Yi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
Phase constitution, microstructure, and mechanical properties of the as-cast and homogenized CrCuFeNiV multi principalelement alloys were investigated. Results show that the microstructures of CrCuFeNiV alloys either in the as-cast orhomogenized state were constituted by the dispersed Cu-rich fcc regions and the matrix regions (intertwined bcc + σ phases). Thereinto, the σ phase, ranged from nanometers to microns, was a complex multicomponent intermediate phase with a highsolubility for Fe, Cr, Ni, and V. This phase structure and hardness had an impressive thermal stability, which was evidencedby the current annealing treatment. High hardness (822 HV and 793 HV) was simultaneously achieved under an appliedload of 200 g in the as-cast and homogenized CrCuFeNiV alloys, on account of the incorporation of the high-stiffness σphase against the fcc and bcc phases. The ultimate compressive strength of ~ 1490 MPa was obtained in the as-cast alloydue to the high deformation resistance to the dislocation movement of bcc phase and precipitation strengthening of σ phaseat the expense of plasticity. The deterioration in plasticity was attributed to the stress concentration easily triggered by thehard and brittle σ phase.
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KEPCO-China Huaneng Post-combustion CO2 Capture Pilot Test and Cost Evaluation
Ji Hyun Lee,No Sang Kwak,Hongwei Niu,Jinyi Wang,Shiqing Wang,Hang Shang,Shiwang Gao 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.1
The proprietary post-combustion CO2 solvent (KoSol) developed by the Korea Electric Power Research Institute (KEPRI) was applied at the Shanghai Shidongkou CO2 Capture Pilot Plant (China Huaneng CERI, capacity: 120,000 ton CO2/yr) of the China Huaneng Group (CHNG) for performance evaluation. The key results of the pilot test and data on the South Korean/Chinese electric power market were used to calculate the predicted cost of CO2 avoided upon deployment of CO2 capture technology in commercial-scale coal-fired power plants. Sensitivity analysis was performed for the key factors. It is estimated that, in the case of South Korea, the calculated cost of CO2 avoided for an 960 MW ultra-supercritical (USC) coal-fired power plant is approximately 35~44 USD/tCO2 (excluding CO2 transportation and storage costs). Conversely, applying the same technology to a 1,000 MW USC coal-fired power plant in Shanghai, China, results in a slightly lower cost (32~42 USD/tCO2). This study confirms the importance of international cooperation that takes into consideration the geographical locations and the performance of CO2 capture technology for the involved countries in the process of advancing the economic efficiency of large-scale CCS technology aimed to reduce greenhouse gases.
ScienceON
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