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

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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

Effect of Graphite Content and Granularity on Mechanical and Tribological Properties of Bronze Alloyed Powder Composite

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Journal of Iron and Steel Research International 2005年第1期12卷 54-57页

作者： DENG Chen-hong CHEN Guang-zhi GE Qi-lu Central Iron and Steel Research Institute

The bronze alloyed powder composite containing nanoparticles was developed by hot *** effects of the content and granularity of graphite on hardness,machinability,bending strength,compression strength,and friction and wear behavior of the composites were *** microstructures of the specimens were analyzed by *** results showed that the graphites are distributed in net when nanographites are added,resulting in the decrease of mechanical properties and abrasive *** the content of nanographite is 10%,the composite is *** graphite is distributed in the form of block when micrographite is added,improving the mechanical properties and abrasive *** track was studied by SEM.

关键词： nanoparticle mechanical property friction wear abrasive resistance

Microstructures and wear resistance of high boron and low carbon ferroalloy using hybrid powder/wire overlaying method

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China Welding 2016年第1期25卷 57-63页

作者：庄明辉李慕勤王军蔡丁森周智远齐兆禹 State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 School of Material Science and Engineering Jiamusi University Jiamusi 154007

The high boron alloy surfacing layer was easily cracked due to its insufficient toughness by using hybrid powder/ wire overlaying method. In order to explore the cracked mechanism, the microstructures and the wear resistance of the samples with different boron contents were studied. Further, phases analysis, microhardness, macrohardness and wear test were also carried out. The boron content depended microstructures were observed. The precipitation of the Fe2B, Fe3 （ C, B）, Fe23 （C, B）6 were increased with the increase of boron content. It was found that the wear resistance was independent of the macrohardness as the macrohardness increased firstly and then remained steady at -62 HRC. However, the wear resistance was depended on the boron contents, and which increased with the increase of the boron contents. The abrasive loss mechanism changed from plastic deformation removal to fracture removal.

关键词： hybrid powder/wire overlaying method boride abrasive resistance

Fe-WC surface composites produced by reactive cast-infiltration

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China Foundry 2004年第2期1卷 138-140页

作者： Daxin ZENG, Janyong LIU, Yuanhao ZHANG (Department of Materials Engineering, Hubei Automotive Industries Institute, Shiyan 442002, Hubei, P. R. China)

The reactive cast-infiltration technique was used to produce an Fe-WC surface composite layer on an iron casting, in which the WC particulates were formed in situ from a reaction of W with C. The structure and phase construction of the surface composite were evaluated by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray (EDS), etc. An Fe-WC surface composite layer with a volume fraction of WC particles up to 30％ and particle size in the range 10～30 μm was successfully produced. abrasive resistance test results show that the Fe-WC surface composite layer possesses great abrasive resistance.

关键词： reactive cast-infiltration Fe-WC surface composite casting microstructure abrasive resistance