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Heat treatment of novel low-carbon multi-alloyed anti-wear marine steel

Progress in Natural Science:Materials International 2011年第3期21卷 254-261页

作者： Jing-hua JIANG~(1,2),Qiu-yue WANG~1,Ai-bin MA~(1,2),Jun SHI~1,Liu-yan ZHANG~1, Hui-dong YANG~(2,3),Fu-min LU~2,Qi ZHOU~2 1.National engineering Research Center of Water Resources Efficient Utilization and engineering Safety, Hohai university,Nanjing 210098,China 2.College of Mechanics and Materials,Hohai university,Nanjing 210098,China 3.department of mechanical and aerospace engineering,north carolina state university, raleigh,north carolina 27695-7919,usa National engineering Research Center of Water Resources Efficient Utilization and engineering Safety Hohai University Nanjing 210098 China College of Mechanics and Materials Hohai University Nanjing 210098 China department of mechanical and aerospace engineering North Carolina State University Raleigh North Carolina 27695-7919 USA

A low-carbon anti-wear steel,multi-alloyed with Si-Cr-Mn-Al-Ni-Mo-（Nb,RE）,was designed for vane pumps of ships. The novel cast steel after various heat treatments was characterized by microstructure observations and mechanical properties measurement in order to achieve an optimal process correlated with good abrasive resistance for a long marine *** scanning calorimetry and hardness analyses deduced a complete austenitizing temperature of 1 000℃,based on the alloying element homogenization and defective structure elimination without grain *** optimal austempering process（austenitized at 1 000℃,quick cooled for holding at 350℃for 1.5 h and then air-cooled to room temperature） produced a uniform mixture structure of fine carbide-free aciculate bainites and few lath martensites,resulting in the tensile strength increase of 34%and impact toughness increase of 50%compared with that of the as-cast *** abrasive wheel tests show that the austempered steel has good wear resistance with a mass-loss rate of 170 mg/（km·cm2） under applied load of 70 N in acidic *** new grade steel （containing anti-corrosion elements of Cr and rare earth） can find wide application in marine engineering,with further enhanced comprehensive properties via melting process improvement.

关键词： abrasive resistance carbide-free bainite marine steel mechanical performance heat treatment

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A Reconstructed Discontinuous Galerkin Method for Compressible Flows on Arbitrary Grids

A Reconstructed Discontinuous Galerkin Method for Compressib...

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中国力学学会学术大会'2009

作者： Hong Luo department of mechanical and aerospace engineering, north carolina state university,raleigh,NC 27695,usa,

The discontinuous Galerkin(DG)methods have recently become popular for the solution of systems of conservation laws,and are widely used in computational fluid dynamics,computational acoustics,and computational electro...

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Preparation and performances of bulk porous Al foams impregnated with phase-change-materials for thermal storage

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Progress in Natural Science:Materials International 2012年第5期22卷 440-444页

作者： Jinghua Jiang a,b,Yingying Zhu b,Aibin Ma a,b,Donghui Yang b,c,Fumin Lu b,Jianqing Chen b,Jun Shi b,Dan Song a,b a National engineering Research Center of Water Resources Efficient Utilization and engineering Safety,Hohai university,Nanjing 210098,China b College of Mechanics and Materials,Hohai university,Nanjing 210098,China c department of mechanical and aerospace engineering,north carolina state university,raleigh,NC 27695-7919,usa National engineering Research Center of Water Resources Efficient Utilization and engineering Safety Hohai University Nanjing 210098 China College of Mechanics and Materials Hohai University Nanjing 210098 China department of mechanical and aerospace engineering North Carolina State University Raleigh NC 27695-7919 USA

Shape-stabilized phase change materials(PCMs) exhibit desirable thermal storage properties and are used for energy conservation *** study is focused on the preparation and thermal-/dynamic-mechanical properties of the bulk porous Al foams impregnated with organic PCMs such as paraffins and stearic *** results indicated that the new shape-stabilized PCMs composites could be produced by a simple and eco-friendly constant-pressure impregnation *** filling fraction of PCMs was approximately more than 80% for the impregnated samples with vacuuming or without *** shape-stabilized PCMs/Al-foam composites exhibited considerable latent thermal storage potential for good interface,desirable phase-change temperature range and latent heat values(72.9kJ/kg for the paraffin/Al-foam composite and 66.7kJ/kg for the stearic acid/Al-foam composite).Moreover,the impregnation of PCMs improved the dynamic-compression yield strength,durability and resistance to oxidation of Al foams and made its ideal energy-saving materials.

关键词： Phase change materials Porous Al foams Composites Thermal storage Dynamic mechanical properties

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The pre-stack migration imaging technique for damages identification in concrete structures

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Theoretical & Applied Mechanics Letters 2011年第5期1卷 18-21页

作者： Ying Luo,1,Ziping Wang,1,Baiqiang Xu,1,2,and Fuhgwo Yuan 1,3,1) Key Laboratory for mechanical Structure Damage Detection Technology of China Machinery Industry Federation,Jiangsu university,Zhenjiang 210013,China 2) Faculty of Science,Jiangsu university,Zhenjiang 210013,China 3) department of mechanical and aerospace engineering,north carolina state university,raleigh NC 27695-7921,usa Jiangsu Univ Key Lab Mech Struct Damage Detect Technol China M Zhenjiang 210013 Peoples R China Jiangsu Univ Fac Sci Zhenjiang 210013 Peoples R China north carolina state Univ Dept Mech & Aerosp Engn Raleigh NC 27695 USA

Pre-stack migration imaging (PMI) method,which is used in geophysical exploration by the performance of single side detection and visually display,can be used to identify the location,orientation,and severity of damages in concrete *** particular,this letter focuses on the experimental study by using a finite number of sensors for further practical applications.A concrete structure with a surface-mounted linear PZT transducers array is *** types of damages,horizontal,dipping and V-shaped crack damage,have been studied.A pre-stack reverse time migration technique is used to back-propagate the scattering waves and to image damages in concrete *** migration results from the scattering waves of an artificial damage are *** is shown that the existence of the damage in concrete structure is correctly revealed through migration process.

关键词： ultrasonic waves PMI damage identification

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