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Influence of carbon content on Element Diffusion in Silicon Carbide-Based TRISO Composite Fuel

Journal of Electronic Research and Application 2024年第5期8卷 80-88页

作者： Xiaojiao Wang Libing Zhu Yan You Zhaoquan Zhang Shanghai Institute of Ceramic Chinese Academy of SciencesShanghai 201899China Shanghai Nuclear Engineering Research and Design Institute Shanghai 200233China

The coating layers of Tri-structural Isotropic Particles(TRISO)serve to protect the kernel and act as barriers to fission *** aids in the silicon carbide matrix variably react with TRISO coating layers,leading to the destruction of the coating *** how carbon content affects element diffusion in silicon carbide-based TRISO composite fuel is of great significance for predicting reactor *** this study,silicon carbide-based TRISO composite fuels with different carbon contents were prepared by adding varying amounts of phenolic resin to the silicon carbide matrix.X-ray Diffraction(XRD)and Scanning Electron Microscopy(SEM)were employed to characterize the phase composition,morphology,and microstructure of the composite *** elemental content in each coating layer of TRISO was quantified using Energy-Dispersive X-ray Spectroscopy(EDS).The results demonstrated that the addition of phenolic resin promoted the uniform distribution of sintering aids in the silicon carbide *** atomic percentage(at.%)of aluminum(Al)in the pyrolytic carbon layer of the TRISO particles reached its lowest value of 0.55%when the phenolic resin addition was 1%.This is because the addition of phenolic resin caused the Al and silicon(Si)in the matrix to preferentially react with the carbon in the phenolic resin to form a metastable liquid phase,rather than preferentially consuming the pyrolytic carbon in the outer coating layer of the TRISO *** findings suggest that carbon addition through phenolic resin incorporation can effectively mitigate the deleterious reactions between the TRISO coating layers and sintering aids,thereby enhancing the durability and safety of silicon carbide-based TRISO composite fuels.

关键词： Silicon carbide TRISO Composite fuel Diffusion behavior carbon content

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Effects of carbon content and Microstructure on Corrosion Property of New Developed Steels in Acidic Salt Solutions

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 115-123页

作者： Feilong Sun Xiaogang Li Xuequn Cheng Corrosion and Protection Center University of Science and Technology Beijing Key Laboratory of Corrosion and Protection(Ministry of Education)

New steels with different carbon contents were self-developed by thermo-mechanical controlled processing. The effects of the carbon content and the microstructure on the corrosion properties of new steels were investigated by immersion test and SEM. The results indicated that the ferrite phase （both the proeutectoid and eutectoid ferrite） dissolved preferentially. Cementite reserved and accumulated on the surface. As carbon content increased, the content of ferrite decreased and cathode/anode area ratio increased. Therefore, the corrosion rate of new steels increased from 0.30 to 0.90 mm/years when the carbon content rose from 0.05 to 0.13 wt%. The corrosion process of new steels was studied using electrochemical impedance spectroscopy experiments during 72 h. It indicated that the impedance modulus *** nz of the new steels reduces with the increase of the immersion time. While the corrosion process of the new steel with 0.11 wt% C developed faster than that with 0.07 wt% C, although their *** nz was similar at the initial stage.

关键词： carbon content Microstructure Corrosion behavior Electrochemical impedance spectroscopy SEM

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EFFECT OF carbon content ON MICROSTRUCTURE AND PROPERTIES OF HIGH STRENGTH AND HIGH ELONGATION STEELS

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Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 65-71页

作者： Y.Chen X.Chen P.H.Li S.K.Pu Z.X.Yuan B.F.Xu D.X.Lou A.M.Guo S.B.Zhou Wuhan University of Science and Technology Wuhan 430081 China

The micro structure and mechanical properties of new kind of hot-rolled high strength and high elongation steels with retained austenite were studied by discussing the influence of different carbon content. The research results indicate that carbon content has a significant effect on retaining austenite and consequently resulting in high elongation. Besides, new findings about relationship between carbon content and retained austenite as well as properties were discussed in the paper.

关键词： carbon content high strength high elongation steel retained austenite

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EFFECTS OF carbon content AND ROLLING PROCESSING ON RETAINED AUSTENITE FOR HOT-ROLLED TRIP STEELS

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Acta Metallurgica Sinica(English Letters) 2002年第5期15卷 439-447页

作者： Y. Chen, X. Chen, Z.X. Yuan, B.F. Xu, A.M. Guo, P.H. Li and S.K. PuWuhan University of Science and Technology, Wuhan 430081, ChinaTechnical Center of Wuhan Iron and Steel Co., Wuhan 430080, China Wuhan University of Science and Technology Technical Center of Wuhan Iron and Steel Co.

The effects of finishing rolling temperature and coiling temperature on retained austen-ite were studied for hot-rolled transformation induced plasticity (TRIP) steels with different carbon content. The experimental results showed that an appropriate volume fraction of retained austenite from 6% to 11% could be obtained according to the different carbon content less than 0.20% by controlled finishing rolling and coiling for the hot-rolled TRIP steels. It can be concluded that carbon content has a significant effect on the fraction of retained austenite and coiling processing plays stronger role on retaining austenite than fishing rolling processing.

关键词： TRIP steel carbon content retained austenite

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Quantitative Analysis of carbon content in Bituminous Coal by Laser-Induced Breakdown Spectroscopy Using UV Laser Radiation

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Plasma Science and Technology 2015年第11期17卷 928-932页

作者：李雄威毛向雷王哲 Richard E.RUSSO State Key Lab of Power Systems Department of Thermal EngineeringTsinghua-BP Clean Energy CenterTsinghua University Guodian New Energy Technology Research Institute Lawrence Berkeley National Laboratory University of California

The carbon content of bituminous coal samples was analyzed by laser-induced breakdown spectroscopy. The 266 nm laser radiation was utilized for laser ablation and plasma generation in air. The partial least square method and the dominant factor bused PLS method were used to improve the measurement accuracy of the carbon content of coal. The results showed that the PLS model could achieve good measurement accuracy, and the dominant factor based PLS model could further improve the measurement accuracy. The coefficient of determination and the root-mean-square error of prediction of the PLS model were 0.97 and 2.19%, respectively; and those values for the dominant factor based PLS model were 0.99 and 1.51%, respectively. The results demonstrated that the 266 nm wavelength could accurately measure the carbon content of bituminous coal.

关键词： LIBS coal carbon content PLS quantitative measurement

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Effect of Melting Iron-Based Alloy Temperature on carbon content Observed in Laser-Induced Breakdown Spectroscopy

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Plasma Science and Technology 2015年第11期17卷 933-937页

作者：林晓梅常鹏辉陈戈华林京君刘瑞祥杨皓 Changchun University of Technology

Our recent work has determined the carbon content in a melting ferroalloy by laser- induced breakdown spectroscopy （LIBS）. The emission spectrum of carbon that we obtained in the laboratory is suitable for carbon content determination in a melting ferroalloy but we cannot get the expected results when this method is applied in industrial conditions： there is always an unacceptable error of around 4% between the actual value and the measured value. By comparing the measurement condition in the industrial condition with that in the laboratory, the results show that the temperature of the molten ferroalloy samples to be measured is constant under laboratory conditions while it decreases gradually under industrial conditions. However, temperature has a considerable impact on the measurement of carbon content, and this is the reason why there is always an error between the actual value and the measured value. In this paper we compare the errors of carbon content determination at different temperatures to find the optimum reference temperature range which can fit the requirements better in industrial conditions and, hence, make the measurement more accurate. The results of the comparative analyses show that the measured value of the carbon content in molten state （1620 K） is consistent with the nominal value of the solid standard sample （error within 0.7%）. In fact, it is the most accurate measurement in the solid state. Based on this, we can effectively improve the accuracy of measurements in laboratory and can provide a reference standard of temperature for the measurement in industrial conditions.

关键词： laser-induced breakdown spectroscopy (LIBS) molten ferroalloy carbon content sample temperature

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EFFECT OF carbon content ON PROPERTIES OF SLACK-QUENCHED RAILS

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Acta Metallurgica Sinica(English Letters) 1992年第5期5卷 349-353页

作者： ZHOU Qingyue WANG Shuqing SHAO Yangdao NIE Shufan ZHOU Zhenguo China Academy of Railway Sciences,Beijing China Acad of Railway Science Beijing China

A comparative investigation was carried out of the routine mechanical properties,fracture toughness,microstructure and hardness of slack-quenched rails containing different carbon *** the rails slack-quenched,their strength and toughness,together with ductility, are obviously improved,and the higher the quench hardening is,the more the resistance to wear and shell will *** was also made of the reason for this improvement and of the effect of carbon content and quench hardening on the properties of rails in combination with the rail-laying trial.

关键词： carbon content slack-quenched rail property

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Mathematical Modeling of carbon content and Intercritical Annealing Temperature in DP Steels by Factorial Design Method

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Journal of Iron and Steel Research International 2014年第7期21卷 715-722页

作者： Gülcan TOKTAS Alaaddin TOKTAS Aslan Deniz KARAOGLAN Department of Mechanical Engineering Balikesir University Department of Industrial Engineering Balikesir University

2k factorial design is employed to find the mathematical relation between the carbon content and intercritical annealing temperature （IAT） in order to predict the responses namely martensite volume fraction （MVF）, microhardness （H）, yield strength （YS）, ultimate tensile strength （UTS）, total elongation （TEL）, yield ratio （YR） and Charpy impact energy （CIE） in dual phase （DP） steels. Steels containing different carbon contents （0.085% C and 0.380% C） had been chosen for this purpose. The main advantages of factorial design are its easy implementation and the effective computation compared with the other optimization techniques, which were employed for predicting mentioned responses in the literature. To verify the proposed approach based on factorial design, experiments for verification were performed. The results of the verification experiments and the mathematical models are in accordance with each other and the literature.

关键词： dual phase steel factorial design material property prediction carbon content intercritical annealingtemperature

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INFLUENCE OF carbon content OF MARTENSITE STEELS ON HARDNESS RE-DISTRIBUTION NEAR WORN SURFACE

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Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 346-352页

作者： Y.P. MaSchool of Metallurgy, Xi’an University of Architecture & Technology, Xi’an 710055, China Manuscript received 5 November 2001 in revised form 30 January 2002 School of Metallurgy Xi’an University of Architecture & Technology

After three-body abrasion, the hardness re-distribution near the worn surface has a close relationship with the carbon content of martensite steel. It is considered that there is a competition between the work-hardening and the temper softening, which results from deformation and friction heat of material. When the carbon content of martensite steel is below about 0.6%, the subsurface hardness distribution of material is a softened layer sandwiched between two hardened layers, but above 0.6%C, no softened region appears on the hardness re-distribution curve.

关键词： martensite three-body abrasion hardness re-distribution carbon content

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STUDY ON THE VARIATION MECHANISM OF carbon content OF LIQUID IRON IN MELTING GASIFIER

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 132-138页

作者： Q.Lu L.F Sun Y.Xu Q.F.Chan Hebei University of Technology Tangshan 063009ChinaHebei University of TechnologyTangshan 063009ChinaHebei University of TechnologyTangshan 063009ChinaHebei Institute of Vocation and TechnologvShiiiazhuang 050031China

This paper studied the changing principles of carbon content in direct reduction iron (DRI) and liquid iron in the COREX melting gasifier. Under the normal working conditions of experimental equipment, liquid nitrogen was poured into the melting gasifier from its tuyere to cool down quickly. And then seven cross sections were made to study the carburization reaction and its characteristics of the solid iron and the liquid iron, and also the reaction of carbon between the slag and the metal. According to the results, the influences of the thickness of the semi-coke layer and the temperature on the carbon content of liquid iron in the COREX melting gasifier were confirmed.

关键词： melting gasifier direct reduction iron (DRI) liquid iron carbon content

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