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Calculation of the Transition Temperature for Partitioned Growth of Proeutectoid Ferrite in Fe-C Base Multicomponent Alloys

Calculation of the Transition Temperature for Partitioned Gr...

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第六届国际低合金高强度钢会议

作者： ZHANG Guo-hong SUH Dong-woo (Graduate Institute of Ferrous Technology Pohang University of Science and Technology Pohang 790-784 Republic of Korea)

＜正＞According to the local equilibrium theory,the ferrite growth from alloyed austenite could be divided into the partition local equilibrium（PLE） mode and negligible partition local equilibrium（NPLE） mode.A graphical construction method proposed earlier by Hillert using in Fe-C-X ternary alloys was extended into Fe-C base multicomponent alloys to calculate the PLE/NPLE transition temperature.The method utilize the carbon component ray,in which the substitutional alloy elements content is constant,to determine PLE/NPLE transition boundary.Using the method,the PLE/NPLE transition temperature in several alloy systems are calculated and compared with the formerly reported results.

关键词： phase transformation local equilibrium kinetics ferrite PLE/NPLE transition

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Influence of Titanium Sol on the Sintering Behaviour, Microstructure and Properties of Al2O3-SiO2 Ceramic Cores

Influence of Titanium Sol on the Sintering Behaviour, Micros...

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中国材料大会2012

作者： Jun Chen Yue Zhang School of Materials Science and Engineering Beihang University

ISBN: (纸本)9783037856079

A series of Al2O3-SiO2 ceramic cores with titanium sol sintered at 1350, 1450, 1500 and 1550℃for 2h, respectively, were prepared, and the phase and microstructure were characterized by X-ray Diffraction and Scanning Electron Microscopy. The influence of titanium sol on the phase transformation, shrinkage rate and flexural strength at room temperature has been investigated. The mullite phase formation temperature decreased by at least 150℃with the addition of 1wt% to 5wt% TiO2 . Additionally, the titania additive promoted the combination of Al2O3 and SiO2 , producing mullite phase which reduced the shrinkage and improved the flexural strength.

关键词： Ceramic core Al2O3-SiO2 Titanium sol phase transformation Shrinkage Flexural strength.

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On the Role of Aluminium in Segregation and Banding in Multiphase Steel

On the Role of Aluminium in Segregation and Banding in Multi...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Ennis Bernard Mostert Richard Jimenez-Melero Enrique Lee Peter Tata Steel PO Box 10000 1970 CA IJmuiden The Netherlands The School of Materials The University of Manchester

In this work we have concentrated on the effect of aluminium on the formation of segregation during casting and the resultant effect on the microstructure and properties of multiphase steel.Different processing conditions were applied on the basis of model calculations in order to promote and suppress banding in segregated and non-segregated steel.It is shown that Al segregates preferentially to the solid during solidification,in contrast to the other elements which segregate preferentially to the liquid and increasing Al content leads to a increased partitioning of the other chemical elements.It has been shown experimentally,and in good agreement with the predicted model calculations,that the effect of segregation second phase banding can be suppressed.The tensile behaviour of all the variants is identical up to the yield point,but the non-banded samples show a much higher tensile strength with similar levels of ductility to the banded samples.

关键词： steel casting segregation phase transformation thermomechanical processing

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phase Separation Process at Early Aging Stage of Ni42CrTiAl

Phase Separation Process at Early Aging Stage of Ni42CrTiAl

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14～(th) Congress of International Federation for Heat Treament and Surface Engineering

作者： Wei ying-hui Hou li-feng Jiao shao-yang Hu lan-qing Xu bing-sheTaiyuan University of Technology Taiyuan China

＜正＞ phase separation process of Ni42CrTiAl alloy aged at various temperatures was studied by means of transmission electron microscope and X-ray diffraction. It was concluded that the temperature of spinodal decomposition is 500℃. And the solid solution break into the lean and the rich areas, moreover the rich solute areas would have ordering arrangement to form ordering phase.

关键词： alloy spinodal decomposition ordering phase transformation

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Preparation and properties of TiO2 /fumed silica composite photocatalytic materials

Preparation and properties of TiO2 /fumed silica composite p...

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2011中国材料研讨会

作者： J.F.Parr Southern Cross GeoScience Southern Cross University

We used fumed silica to produce photocatalytic materials.TiO 2 gel was obtained using tetrabutyl titanate as a precursor via an acid catalyzed sol-gel process.We produced a novel TiO 2 /fumed silica porous ceramic material while using a 4% phosphoric acid binder.The influence of heating temperature on the crystalline phases of TiO 2,its properties and its photocatalytic activity was investigated.Results showed that the transformation of TiO 2 from anatase to rutile began at 725 °C.The photocatalytic porous ceramic materials that were heated at 700-800 °C posses high tensile strength （7.67-8.18 MPa）,high specific surface areas （25.01-25.07 m 2 g 1）,high anatase content （＞90%） and good photocatalytic activity,as confirmed by the complete degradation of a 10 mg·L-1 methyl orange solution using 15W.m-2 ultraviolet light irradiation over 24 h.This technique successfully overcomes the difficulties in separation and recovery commonly associated with most commercial TiO 2 in a superfine powder state.

关键词： Shaping TiO2 SiO2 phase transformation Catalytic properties

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