材料期刊网

THE MICROSTRUCTURE AND PROPERTY OF IN SITU TiC_P/Fe COMPOSITE

Y.W.Yan1) , B.K.Wei2) , Z.Y.Fu1) , H.T.Lin2) and R.Z.Yuan1) 1) State Key Lab .of Advanced Technologyfor Materials Synthesisand Processing , Wuhan University of Technol ogy , Wuhan 430070 , China 2) Institute of Materials , Huazhong University of Science and Technology , Wuhan 430074 , China

金属学报(英文版)

Under aircondition,theinsitu TiCP/ Fecompositeshavebeen fabricated by a reactivecast ing route usingtheinexpensiveraw materials. The microstructuresofthecompositehavebeen studied by X ray diffraction,image analyzer and analyticalelectron microscopy. The me chanicalpropertiesand abrasive wearresistanceofboththeas castcompositeandthequenched composite havebeen measured. Theresultsshow thattheinsitu TiCparticles with a average sizeof 4 51μm exhibit a homogenous distribution inthe matrix, and an excellentinterface bonding between the particle and the matrix is achieved. As above microstructure features, thecomposite,especiallythequenched composite, hashigher mechanicalpropertiesand betterwear resistance,compared with high Cr whitecastiron.

关键词: TiCP/ Fecomposite , null , null , null , null

NVESTIGATION OF PRODUCTOPN OF FUNCTIONALLY GRADIENT MATERIAL BY ELECTROLESS PLATING

Z.M.Xu1) , J.S.Zhen1) , H.F.Liu1) and L.M.Zhang2) 1)Departent of Chemistry , Huazhong University of Science and Technology , Wuhan 430074 , China 2)Institute of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , China

金属学报(英文版)

Thispaper proposed a new methodof producing Ceramic/ Metalfunctionally gradient mate rialby electroless platingtechnique. The experimentof producing SiC/ Ni PFGM wascar ried out with self made electroless plating facilities. The results show that the thickness of FGMcoating andthegradientdistribution ofcompositioncanbecontrolled byoptimizingelec trolessplating technology and changing the parameters such as plating time, the additionspeed and concentration of SiCparticles. Analysisdemonstratesthatthereisastrongrelation ship amongthe SiCcontent,the microstructureandthe mechanicalproperty ofthe FGM.

关键词: electrolessplating , null , null

WETTABILITY BETWEEN TiB_2 CERAMIC AND METALS

J.Y. Zhang , Z.Y. Fu , W.M Wang , H. Wang and X.M. Min State Key Lab .of Advanced Technologyfor Materials Synthesis and Processing , Wuhan University of Technolo gy , Wuhan 430070 , China

金属学报(英文版)

Self consistent Field discrete variational Xα( SCF Xα DV) method was used to study the wettabilitybetween TiB2 Ceramic and Metals. The Metals were Ni, Mo, Ni+ Mo, and etc. microstructureof TiB2/ Fe, TiB2/ Niand TiB2/ NiMoinvestigatedby TEM werechosen toidentify the calculation model. The result shows the wetting in the above systems were chemicalreactive wetting ,and can becalculated by SCF Xα DV . Theeffectof active ele ment( Mo) to TiB2/ Ni wettability wasstudied too.

关键词: wetting , null , null

STRUCTURE,CHEMICAL BONDS AND THER MOELECTIC PROPERTY OF Si DOPED BORON CARBIDES

X.M.Min , C.W.Nan and K.F.Cai National Key Laboratory of Advanced Technology for Materials Synthesis and Processing , Wuhan University ofTechnology , Wuhan 430070 , China

金属学报(英文版)

Thecorrelation between composition, structure, chemical bond, and thermoelectric proper tiesof Si doped boroncarbidesisstudied using SCF DV Xαmethod. Thecalculationsshow that Siatom firstlysubstitutes Bor Catomson theend of boron carbidechain, then may occupyinterstitialsites when Siis dopedin boron carbide, anditisdifficultfor SitosubstituteBor Catom in thecenter of chain orintheicosahedron. Arepresentativestructural unitcontain ing an Si atom is 〔C B Si〕ε+ 〔B11 C〕ε , whilethe structural unit without Siis 〔C B B ( C)〕δ 〔B11 C〕δ+ . Afteradding Sitotheboroncarbides,theenergyrequired bythe dispro portionation reaction decreases,theconcentrationofthecarriersincreases,andthereare more pathsfor the bipolaron to hopping. At thesametime, the covalent bond becomes weaker, andthethermal conductivity decreases. Therefore, thethermoelectric property of Si dopedboron carbidesisimproved .

关键词: Si doped boroncarbide , null , null

STRUCTURES OF γ Al_2O_3 AND AlON STUDIED BY ~(27)Al NMR AND QUANTUM CHEMISTRY CALCTLATIONS

X.M.Min , Y. Daiand C.W.Nan National Key Laboratory of Advanced Technology for Materials Synthesis and Processing , Wuhan University ofTechnology , Wuhan 430070 , China

金属学报(英文版)

Al NMRand quantum chemistry calculation have been used to study thestructureof γ Al2O3 and AlON. The NMRspectra arecharacterized bythree distinctresonance peaksat114 , 66 and 12 , corresponding to 〔AlN4〕,〔AlO4〕and 〔AlO6〕respectively. The uantum chemistrycalculationsshowqd thatthe models with vacancieslocated at octahedralsitein B block are morestablethanthose with vacancieslocated attetrahedralsitein A blockforboth of γ Al2 O3 and AlON. In AlON, nitrogen atoms preferentially replace oxygen atoms in〔AlO4〕tetrahedrons, and the model with 〔AlN4〕is morestablethan that with 〔AlO4 xNx〕(x= 1 ,2 and 3) and 〔AlO6 - yNy〕(y= 1 ,2 ,3 and 4) , which isin agreement with theexperimental analysisby NMR.

关键词: Al2 O3 and AlON , null , null , null

Practice for Extending Blast Furnace Campaign Life at Wuhan Iron and Steel Corporation

ZHANG Shourong

钢铁研究学报(英文版)

One of the problems encountered in 60′s to 80′s of 20th century in China′s steel industry was short life of blast furnace shaft as well as the excessive erosion of blast furnace hearth. A series of research work was carried out in order to extend blast furnace campaign life. The concept of research and development was integrated in the construction of BF (blast furnace) No5 at WISCO (Wuhan Iron and Steel Corporation), and in October, 1991, the BF No5 was blown in. The blast furnace has worked smoothly for more than 15 years without any medium repair even guniting. It is expected that the campaign life of BF No5 would be longer than 16 years with a production over 11 000 t per unit inner volume (m3). A new blast furnace with an inner volume of 3 400 m3 is under construction, and is designed with a campaign life of 20 years without any medium repair. The campaign life of blast furnaces in China has been extended in recent years.

关键词: blast furnace;campaign life;erosion

Practice for Extending Blast Furnace Campaign Life at Wuhan Iron and Steel Corporation

钢铁研究学报(英文版)

关键词:

欢迎投稿、订阅《Journal of Wuhan University of Technology-Materials Science Edition》

武汉理工大学学报-材料科学版(英文版)

关键词:

Application of Low-penetration Concrete as the Protecting Layer in Wuhan Yangtse River Tunnel Tube

武汉理工大学学报-材料科学版(英文版)

关键词:

Effects of TMCP Parameters on Microstructure and Mechanical Properties of Hot Rolled Economical Dual Phase Steel in CSP

TAN Wen , HAN Bin , WANG Shui-ze , YANG Yi , ZHANG Chao , ZHANG Yong-kun

钢铁研究学报(英文版)

Effects of chemical compositions, finish rolling temperature, isothermal temperature on runout table and coiling temperature on microstructure and mechanical properties of economical dual phase steel produced on CSP line were investigated. Experimental results showed that martensite volume fraction could be enhanced and banding microstructure could be reduced by controlling Mn, Si contents and applying proper finish rolling temperature. Optimized processing-parameters were obtained for DP580 production on CSP line of Wuhan Iron and Steel (group) Co (WISCO) in China. Optimal microstructure and mechanical properties could be achieved when the strip was finished rolling at the range of 790 to 830 ℃, isothermally holding at 680 to 740 ℃ and coiling below 250 ℃.

关键词: economical dual phase steel , mechanical property , banding microstructure , processing-parameter