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Microstructure and mechanical properties of Fe/NbC composite layer prepared by in-situ reaction

China Foundry 2023年第4期20卷 356-364页

作者： Le Chen Ji-lin Li Meng-jun Wang Jie Zheng Yao Zhu Zhuo-lin Liu Bing-gui Lü School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Guangzhou 510650China Guangdong Guangyun New Material Co. Ltd.Yunfu 527527GuangdongChina Yunfu Guangyun Technology R&D Co. Ltd.Yunfu 527527GuangdongChina

NbC ceramic surface-reinforced steel matrix composites were prepared by an in-situ reaction method at different temperatures(1,050℃,1,100℃and 1,150℃)for different times(1 h,2 h and 3 h).The phase constitution,microstructure and fracture morphology of NbC ceramic surface-reinforced steel matrix composites were analyzed by Xrd,SEM and EdS,and the effects of the in-situ reaction temperature and time on the mechanical properties were systematically *** results indicate that the NbC reinforcement layer is formed through the reaction between Nb atoms and carbon atoms diffused from the steel matrix to the Nb *** thickness of this reinforcement layer increases as the reaction time ***,an increase in reaction temperature results in a thicker reinforcement layer,although the rate of increase gradually *** relationship among the thickness of the Nb C reinforcement layer,the reaction time and temperature was established by data *** optimal tensile performance is achieved at 1,100℃for 1 h,with a tensile strength of 228 *** is also found that the defects between the reinforcement layer and the steel matrix are related to reaction *** 1,100℃,these defects are *** mostly occurs in the NbC reinforced layer of the composites,and the fracture mode is characterized by typical intergranular brittle fracture.

关键词： in-situ reaction NbC reinforcement layer microstructure mechanical property

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Assessment of different Field development Strategies deploying Maximum reservoir Contacting (MrC) Well in Carbonate reservoir: A case study of Oilfield r

Assessment of Different Field Development Strategies Deployi...

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2023 SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition, APOG 2023

作者： Jia, Han Tong, Min Peng, Hui deng, Xili Song, ruixuan Wang, rui RIPED PetroChina China Artificial Intelligence Technology R&D Center for Exploration and Development CNPC China University of California Santa Cruz United States

ISBN: (纸本)9781613999813

deploying horizontal well is one of the efficient methods to enhanced oil recovery. Maximum reservoir Contact (MrC) well, based on the horizontal well, which indicates the contacting area of wellbore and reservoir should be as large as possible to obtain the optimum exploration effects. The purpose of this paper is to build an assessment and optimization work-flow, which guides the well pattern improvement and well-type selection via a case study of the filed r in a Middle East Carbonate reservoir. Analyzing several field development index, like production performance, gas oil ratio, water cut, pressure, etc. in a pilot-scale well pattern both for the conventional horizontal wells and MrC wells using different injection schemes, including injection timing, injection volume, and injection components, via reservoir numerical simulation. The method using to evaluating reservoir exploration effect in this paper is numerical simulation, assuming different development strategies and well-type, via reservoir numerical simulator. Control-variate method as well as used in this study, which focus on keeping single factor analysis for the simulation. Comparing all the field development indexes among different cases while keeping other factors consistent, for example, exploring the influence from well types, which are MrC well and conventional horizontal well, two cases must be deployed the same injection schemes. Simulating different cases with analyzing the results, MrC wells obtain the better oil production generally compared with conventional horizontal wells. However, oil production performance is not the only index which is cared for in oil & gas industry, additionally, in terms of reservoir engineering, water cut, water breakthrough, gas breakthrough, gas oil ratio, oil steady production plateau, etc., while some economic indexes are extremely concerned by the experts and companies. Consequently, assessment of MrC wells effect should consider many factors from the perspe

关键词： Gases

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Competitive role of film-like austenite and transition carbides on hydrogen embrittlement resistance and impact toughness in bainite-containing quenched and partitioned steel

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Journal of Iron and Steel research International 2023年第4期30卷 782-794页

作者： Kai Yang Yi Luo Wei Li Li Wang Zhong-qu Sun Jun-liang Liu Xue-jun Jin Bao Steel-SJTU Joint Research Center of Future Steels School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Development and Application Technology of Automotive Steels(Bao Steel) Research Institute(R&D Center)Baoshan Iron&Steel Co.Ltd.Shanghai 200240China

A microstructure composed of martensite matrix,lower bainite,and stable film-like austenite was designed by a quenching and isothermal bainitic holding process in a 0.30C–2.69Mn–1.71Si(wt.%)*** yield strength,tensile strength,and ductile-to-brittle transition temperature(dBTT)of the high-strength steel thus obtained were 1263 MPa,1521 MPa,and-33℃,respectively,and at-20℃,it showed superior low-temperature toughness,which reached 77.5 J/cm^(2).Meanwhile,it showed excellent hydrogen embrittlement(HE)resistance,and the total elongation loss is only 3.1%after 15 min of hydrogen *** excellent comprehensive performance is attributed to the fact that fine stable austenite with film-like morphology hindered the crack nucleation and propagation,and hindered hydrogen diffusion as a hydrogen ***,with a decrease in the isothermal temperature,transition carbide precipitation was accompanied by a further decrease in austenite grain *** this condition,although transition carbides can act as effective hydrogen traps,excessive precipitation decreased the carbon content of retained austenite and increased the deformation heterogeneity between austenite and martensite matrix,leading to weakened austenite stability and HE resistance,a total elongation loss of approximately 39%(15 min hydrogen charging),a sharp decrease in impact toughness,and an increase in *** competitive role of film-like austenite and transition carbides on the comprehensive mechanical performance of steel is revealed,especially the suppression of crack nucleation and propagation that will provide a guide for the design of high strength steels with excellent impact toughness and HE resistance.

关键词： Quenched and partitioned steel Isothermal bainite transformation Transition carbide Hydrogen embrittlement Impact toughness

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Balancing Magnetic and Mechanical Properties of Non-oriented Electrical Steel:Correlation Between Microstructure and Properties

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Acta Metallurgica Sinica(English Letters) 2024年第12期37卷 2136-2149页

作者： Zhaoyang Cheng Jing Liu Chunlei Yu Bolin Zhong Shenglin Chen Bing Fu Soran Birosca The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Material Science and EngineeringShenzhen UniversityShenzhen518060China Hubei Engineering Technology Research Center of Marine Materials and Service Safety Wuhan University of Science and TechnologyWuhan430081China The R&D Center of Wuhan Iron and Steel Co. Ltd.Wuhan430080China School of Mechanical and Design Engineering in the Faculty of Technology University of PortsmouthPortsmouthPO13DJUK

High performance e-motors require a continuous enhancement of physical and mechanical properties for non-oriented electrical steel(NOES).However,the optimization of mechanical and magnetic properties simultaneously during NOES processing is extremely challenging where both properties directly influenced by alloy grain size,crystallographic texture,and dislocation *** the current investigation,recrystallization annealing cycles were employed to modify the microstructure with the aim of balance magnetic and mechanical properties of NOES *** results showed that with increasing annealing temperatures,the degree of recrystallization and grain size increased,while the dislocation density reduced considerably at the early stage of ***,the values of texture parameter A*_(overall)(which is a function of overall individual grain orientations and their alignments with easy magnetization directions)were *** was evident that the magnetic properties were significantly improved,however the alloy strength was reduced with increasing annealing ***,the correlation between magnetic properties as well as alloy strength on grain size,texture,and dislocation density were *** crystallographic texture intensity and measured properties quantitative analyses it was concluded that grain size was the predominant factor in balancing the mechanical and magnetic properties of the studied ***,the optimal comprehensive properties(both magnetic and mechanical)were achieved by annealing at 800℃,which yielded a magnetic induction B5000 of 1.616 T,a high-frequency iron loss P_(1.0/400)of 22.43 W/kg,and a yield strength of 527 MPa.

关键词： High strength non-oriented silicon steel Microstructure Texture Magnetic properties Mechanical properties

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Effect of Al addition on the room and cryogenic temperature deformation of Mg-xAl-1Zn-1Ca alloy(x=1,2 wt.%)

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Journal of Magnesium and Alloys 2024年第11期12卷 4694-4708页

作者： Hafiz Muhammad rehan Tariq Umer Masood Chaudry Muhammad Ishtiaq Minki Kim Mansoor Ali Tea-Sung Jun Department of Mechanical Engineering Incheon National UniversityIncheon 22012Republic of Korea Research Institute for Engineering and Technology Incheon National UniversityIncheon.22012Republic of Korea Department of Materials Engineering and Convergence Technology Gyeongsang National UniversityJinju 52828Republic of Korea Flexible Manufacturing R&D Department Korean Institute of Industrial TechnologyIncheon 21999Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

This study explores the influence of Al addition on the microstructure,texture and mechanical deformation behavior of Mg-x Al-1Zn-1Ca(x=1,2 wt.%)alloy(referred as AZX211 and AZX311,respectively).Tensile tests were performed at room(24℃,rT)and cryogenic temperature(-150℃,CT)to probe the dislocation and twinning evolution and its consequent effect on the strength,ductility and hardening *** results revealed that AZX311 exhibited an outstanding combination of superior strength and excellent ductility at both *** unique balance of high tensile strength and consistent ductility outperforms previously documented magnesium alloys,positioning AZX311 as an ideal material for applications that demand both robust mechanical properties and reliable ductility,particularly under low-temperature *** exceptional strength at cryogenic temperatures in this alloy is attributed to the synergistic effect of dislocation strengthening and boundary strengthening,where the increased barriers to dislocation movement lead to significant *** presence of nano-stacking faults and greater activation of pyramidal slip,along with their interactions,result in a substantial increase in tensile strength while maintaining ductility at cryogenic temperature making it a suitable fit for cryogenic applications.

关键词： Magnesium alloys Cryogenic deformation Twin-twin interactions Tensile Strength Stacking Faults

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Impact–sliding fretting tribocorrosion behavior of 316L stainless steel in solution with different halide concentrations

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Friction 2023年第12期11卷 2310-2328页

作者： Xu MA Wei TAN remy BONZOM Xue MI Guorui ZHU School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Zhejiang Institute of Tianjin University Ningbo 315201China Electricitéde France R&D Materials and Mechanics of Components DepartmentMoret sur Loing 77818France Nuclear Power Institute of China Chengdu 610044China

Impact–sliding caused by random vibrations between tubes and supports can affect the operation of heat *** addition,a corrosive environment can cause damage,accelerating the synergism of corrosion and ***,the focus of this work was the impact–sliding fretting tribocorrosion behavior of 316L heat exchanger tubes at different halide concentrations.A device system incorporating the in situ electrochemical measurements of impact–sliding fretting corrosion wear was constructed,and experiments on 316L heat exchanger tubes in sodium chloride(NaCl)solution with different concentrations(0.0,0.1,0.5,1.0,3.5,and 5.0 wt%)were carried *** synergism between wear and corrosion was also calculated and *** wear and damage mechanisms were elucidated by correlating the corrosion–wear synergism,morphologies,and material loss *** results indicated that the stable wear stage occurred at approximately 9–12 h,after which the corrosion current increased with the expansion of the wear *** the halide concentration increased,the scale of damage on the wear scars gradually decreased,changing from being dominated by cracks,delaminations,and grooves to being dominated by scratches,microgrooves,and *** was an obvious positive synergism between wear and *** material loss was dominated by pure mechanical wear and wear enhanced by corrosion,but corrosion enhanced by wear contributed more than tangential sliding fretting *** total mass loss increased gradually in the range of 0.0–0.5 wt%and decreased in the range of 0.5–5.0 wt%.Large-scale damage enhanced by corrosivity and small-scale damage reduced by lubricity dominated the material loss at low and high concentrations,respectively.

关键词： impact-sliding fretting wear tribocorrosion halide concentration 316L stainless steel

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Preparation,Characterization,and Performance of Lignin-based Microencapsulated red Phosphorus Flame retardant for ABS

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Journal of Wuhan University of technology(materials Science) 2022年第2期37卷 292-299页

作者： XIONG Lei HUANG Shaohuai ZHONG rouchao TANG Weizhong LIU Chao JIN Yanqiao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China China National R&D Center for Tungsten Technology Xiamen Tungsten Co.LtdXiamen 361009China

The inherent difficulty in preservation and processing of conventional red phosphorus flame retardant severely limits its growing applications in polymer materials,thus,there is an urgent need to exploit effective technology to modify red *** lignin-based compounds can provide a great potential in improving the preservation and processing of red ***,we prepared melamine modified lignin/aluminum phosphate coated red phosphorus(LMAP@rP)and used it as the flame retardant of acrylonitrile-butadiene-styrene(ABS)*** 25wt%loading LMAP@rP,the ABS samples show excellent flame inhibiting capacity and reached UL-94 V-0 *** calorimetry test results show that the peak heat release rate,total heat release and total smoke release of ABS/25LMAP@rP are reduced strikingly by 64.6%,49.3%,and 30.1%,*** char residue is 15.36wt%and the char layer is continuous and *** outstanding flame retardant and smoke-suppressant performances of LMAP@rP show its application prospect for ABS.

关键词： lignin red phosphorus ABS flame retardant

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Copper removal Methods From Steel — A Critical Assessment

Copper Removal Methods From Steel — A Critical Assessment

引用

AISTech 2024 Iron and Steel technology Conference

作者： Schrama, F.N.H. Cancado, r. Botinha Lopes Hussain, I. dogan, N. Yang, Y. Tata Steel R&D IJmuiden The Netherlands PO Box 10000 IJmuiden1970 CA Netherlands Delft University of Technology Department of Materials Science and Engineering Mekelweg 2 Delft Netherlands

ISBN: (纸本)9780930767259

In this study, different existing methods to remove alloyed and coated copper from steel are summarized, compared, and discussed. None of these methods have been scaled up industrially so far. Characterization of industrial steel scrap will indicate in which forms and quantities copper is present. Based on environment, economics and process efficiency, the most promising techniques will be selected for further investigation. The study will then focus on ways to bring the process efficiency to the level required for industrial application, by better understanding of thermodynamic limits and the reaction kinetics. Possible removal of other undesired elements from the scrap will be taken into account as well. © 2024 by the Association for Iron & Steel technology.

关键词： Efficiency

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research and application of drilling rig optimization model 8

Research and application of drilling rig optimization model

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8th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2024

作者： Xiao, Yue Zhou, Tuo Liu, Guojun Chen, Xuanren Kong, Xiangji Zhang, Yu Liu, Longlong diao, Shunong PetroChina International Exploration and Development Co. Ltd Overseas Drilling and Completion Technology Center Cnpc Engineering Technology R&d Co. Ltd Beijing China PetroChina International Exploration and Development Co. Ltd Beijing China Changchun University of Technology Changchun China Beijing China

ISBN: (纸本)9798331506230

The optimal selection of drilling rigs is crucial for the rational arrangement of drilling rigs in multi operation teams, the improvement of moving operation management level, and the enhancement of drilling operation quality and efficiency. At present, the optimal selection of drilling rigs only considers whether the drilling meets the needs of the drilling project and the moving distance, and cannot comprehensively and scientifically select drilling rigs, which is not conducive to the rational configuration evaluation of oilfield drilling rig operation. This article comprehensively considers key indicators such as drilling efficiency, time efficiency, moving cycle, moving cost, and moving distance, innovatively forms a pentagonal drilling rig optimization coordinate system, establishes drilling rig optimization rate, comprehensive standard deviation, drilling rig optimization comprehensive standard deviation and other indicators, and forms a drilling rig optimization model for drilling. Taking Block B as an example, the priority of Block B with three drilling rigs to be optimized calculated using the model is r1> r2> *** optimal selection rate of drilling r1 is the highest, the comprehensive standard deviation is smaller, and the comprehensive index of the best and more stable drilling performance is the highest, which is 0.0058. Therefore, r1 should be selected for drilling. The drilling rig optimization model proposed in this paper provides a process reference for drilling rig optimization, quantifies various indicators, and provides a theoretical basis for new well drilling rig optimization, project company drilling rig operation plan formulation, and improving project company drilling rig management level. © 2024 IEEE.

关键词： Efficiency

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design and Simulation of Hinge-type ro-ro (roll-on/roll-off) Ship Car deck Structure 33rd

Design and Simulation of Hinge-type Ro-Ro (Roll-on/Roll-off)...

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33rd International Ocean and Polar Engineering Conference, ISOPE 2023

作者： Kim, Hyun Soo Cho, Min Goo Kang, Sung Wook Kim, Jae Woong Pyo, Chang Min Ji, Chang Wook Park, Jang Ik Precision Mechanical Process and Control R&D Group Korea Institute of Industrial Technology Gyeongsangnam-do Jinju Korea Republic of Automotive Materials & Components R&D Group Korea Institute of Industrial Technology Gwangju Korea Republic of Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan Korea Republic of Research center Dae Lyun Engineering Co. Ltd. Busan Korea Republic of

ISBN: (纸本)9781880653807

ro-ro ships can roll-on or roll-off cargo with self-driving power such as passenger cars and trucks, and container cargo on transport devices such as trucks or trailers on a ramp. The representative types of ro-ro ships are PCC (Pure Car Carrier) and PTCT (Pure Car & Truck Carrier). ro-ro ship is configured to load as many cargoes as possible by dividing the cargo hold into multiple card decks up and down. It is necessary to adjust the height of the car deck according to the type of vehicle being loaded. For this purpose, a number of fillers are installed on the inner deck of the ro-ro ship. In other words, to load high cargo such as heavy equipment on the car deck, the height between the decks must be high. At this time, the liftable car deck is adjusted using the deck lifter installed on the pillar. Existing liftable car deck structures are made of a single large plate, so it takes a lot of time and money to install and dismantle them. In this study, a hinge-type liftable car deck was designed. In addition, the overall structural integrity including the hinge was evaluated through structural analysis in accordance with the classification regulations. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Arctic engineering

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