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The mathematical model of wetting angle of heterogeneous nucleation

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Science china(Technological Sciences) 2004年第4期47卷 391-397页

作者： HUANG Cheng1, SONG Bo1, MAO Jinghong2 & ZHAO Pei3.1. School of Metallurgical and Ecological Engineering, University of Science and Technology beijing, beijing 100083. china 2. School of Material Science, University of Science and Technology beijing, beijing 100083. china 3. central iron and steel research institute, beijing 1.0081. china School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing China School of Material Science University of Science and Technology Beijing Beijing China central iron and steel {3. institute Beijing China

The heterogeneous nucleation has been analyzed in terms of the thermodynamic theory, and the mathematical model of wetting angle of heterogeneous nucleation has been developed based on the dynamic requirements of hetero- and homogeneous nucleation. With the wetting angel model, the wetting angles of different catalysts in liquid iron have been calculated. The result shows that the wetting angle of most catalysts is smaller than 40, and the value of f() is far less than 1. The wetting angles of TiN, TiC and RE2O3.are smaller, while the wetting angle of MnO is bigger among the ordinary nucleation catalysts. The wetting angles calculated by this model are in agreement with the results of other research work.

关键词： heterogeneous nucleation, mathematical model, wetting angle, undercooling.

Martensitic Transformation and Magnetic-Field-Induced Strain in Magnetic Shape Memory Alloy NiMnGa Melt-Spun Ribbon

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Journal of Materials Science & Technology 2005年第2期21卷 211-214页

作者： Shihai GUO, Yanghuan ZHANG, Jianliang LI, Baiyun QUAN, Yan QI and Xinlin WANG Department of Functional Material research, central iron and {3. research institute, beijing 1.0081. china Dept. of Functional Mat. Res. Central Iron and Steel Res. Inst. Beijing 100081 China

A magnetic shape memory alloy with nonstoichiometric Ni50Mn27Ga23.was prepared by using melt-spinning technology. The martensitic transformation and the magnetic-field-induced strain (MFIS) of the polycrystalline melt-spun ribbon were investigated. The experimental results showed that the melt-spun ribbons underwent thermal-elastic martensitic transformation and reverse transformation in cooling and heating process and exhibited typical thermo-elastic shape memory effect. However the start temperature for martensitic transformation decreased from 286 K for as-cast alloy to 254 K for as-quenched ribbon and Curie temperature remains approximately constant. A particular internal stress induced by melt-spinning resulted in the formation of a texture structure in the ribbons, which made the ribbons obtain larger martensitic transformation strain and MFIS. The internal stress was released substantially after annealing, which resulted in a decrease of MFIS of the ribbons.

关键词： Shape memory alloy Ferromagnetism Melt-spinning Martensitic transformation Magnetic-field-induced strain

Study on Transformation of CaO-Al_2O_3.SiO_2-MgO System Inclusions in ZG06Cr13.i4Mo Stainless steel

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Journal of iron and steel research International 2011年第S2期18卷 341-346页

作者： LIU Jian-hui1,3. DONG Han1,3. ZHU Rong2, LI Shi-qi2 (1. institute for Structural Materials,central iron and {3. research institute, beijing 1.0081.china 2. School of Metallurgical and Ecological Engineering,University of Science and Technology beijing, beijing 100083.china 3. National Engineering research Center of Advanced {3. Technology, beijing 1.0081.china) Cent iron & steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China Natl Engn Res Ctr Adv steel Technol Beijing 100081 Peoples R China Univ Sci & Technol beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China

This paper aims at generally studying on the inclusions of ZGG06Cr13.i4Mo ultra-low carbon stainless steel used for large scale hydraulic turbine sets. On the basis of analysis the industrial test samples, thermodynamic software FactSage is used to study inclusions transformation process in CaO-SiO2-Al2O3.MgO system while stainless steel is been smelting. The results illustrate the inclusions melting points and plasticity variation law. The reasonable inclusions plasticity controlling area is found out in low melting point. The melting point is up to 1280℃ While MgO weight concentration is 10% in CaO-SiO2-Al2O3.MgO system, SiO2, Al2O3.and CaO in inclusions are in weight concentration range of 50-70%, 10-20% and 10-40%, respectively. For purpose of gaining low melting point inclusions, silicon alumina radio in deoxidant should be controlled between 2-5 for ultra-low carbon stainless steel refining in industry.

关键词： ZG06Cr13.i4Mo stainless steel low melting point inclusion thermodynamic calculation

CREEP BEHAVIORS OF Mg MICROALLOYED WROUGHT SUPERALLOYS

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 208-212页

作者： MA Peili YUAN Ying ZHONG Zengyong central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing,china MA Peili Senior Engineer,Lab.of Superalloy,central iron and steel {3. institute,Ministry of Metallurgical Industry,beijing {13.china

By adding small amount of Mg to the wrought superalloys,the steady stage of creep,and es- pecially the tertiary stage of creep are ***,the steady creep rate is decreased within the range of low strain *** higher strain rates,however,the effect of Mg on creep rate *** may be attributed to the Mg dissolution in the matrix.A mechanism of the effects of Mg addition on creep behaviors is proposed.

关键词： Mg microalloying creep wrought superalloy activation energy of vacan-

BEHAVIOR OF FINE V-Ti COMPLEX CARBONITRIDE IN steel 09MnVTiN DURING REHEATING

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 112-115页

作者： TANG Guoyi ZHENG Yangzeng Yanshan University,Qinhuangdao,china ZHU Jing CAI Qigong central iron and {3. research institute,Ministry of Metallurgical Industry,beijing,china Yanshan Univ Qinhuangdao China

An investigation was carried out of the morphology and microstructure of V-Ti complex carbonitride in steel 09MnVTiN during reheating under analytical electron *** prior V-rich ellipsoid V-Ti complex carbonitride particles are replaced progressively by Ti-rich cubic ones as the reheating temperature elevated from 1050 to 1400℃.The Ti con- tents in the core and border of particles increase from 15 and 6% in hot-rolled specimens into 84 and94% at 1400℃ respectively.

关键词： steel 09MnVTiN microalloyed steel thermomechanical processing complex carbonitride

Vibration-Induced Friction Temperature Field Analysis Under Different Working Condition of Heavy Load Bolt

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Journal of iron and steel research International 2011年第S1期18卷 641-645页

作者： LIANG Feng-rui,SU Hang,YANG Cai-fu (institute for Structural Materials,central iron and {3. research institute,beijing 1.0081.china) Cent iron & steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China

Based on thermal-stress coupling analysis and material properties studies,the vibration-induced friction process of a special used heavy-load bolt has been *** temperature distribution of the bolt has been calculate with heat radiation and heat convection *** a solid lubricant,polytetrafluoroethylene (PTFE) has bee considered to reduce the friction heat *** result shows that,there are very strong heat effect while no lubracant considered,the temperature of the bolt joint increased sharply and up to 700℃,which exceed the allowable temperature range of the *** PTFE lubricant has been applied,the temperature of the bolt joint increased to 260 ℃,and the bolt steel can by applied in this *** results provide important guidance for the bolt structure modification and material selection.

关键词： friction heat temperature field materials phase transition solid lubrication thermal-stress coupling analysis

Thermodynamics of Cu-Ce-M(M=Sn,Zn,Pb)liquid solutions

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中国有色金属学会会刊：英文版 1994年第3期4卷 17-20页

作者： Du, Ting Li, Guodong(central iron and steel {3. institute Ministry of Metallurgical Industry ,beijing 1.0081.

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ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｃｅ－Ｍ（Ｍ＝Ｓｎ，Ｚｎ，Ｐｂ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳＤｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅＭｉｎｉｓｔｒｙｏｆＭｅｔａｌｌｕｒｇｉ...

关键词： Cu-Ce-M(M=Sn Zn Pb) liquid solutions thermodynamic properties

Recent Development and Applications of V Microalloying Technology in china

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Journal of iron and steel research International 2011年第S1期18卷 836-842页

作者： YANG Cai-fu,SU Hang,CHAI Feng,PAN Tao,ZHANG Yong-quan (central iron and steel {3. institute,beijing 1.0081.china) Cent iron & steel Res Inst Beijing 100081 Peoples R China

This paper reviews recent developments of V microalloying technology and its applications in HSLA ***-nitrogen in V-containing steel promotes precipitation of fine V(C,N) particles,and improves markedly precipitation strengthening effectiveness of vanadium,therefore,there is a significant saving of V addition in the same strength *** can be used effectively for ferrite grain refinement by the nucleation of intragranular ferrite promoted by VN precipitates in *** combination of intragranular ferrite (IGF) on VN particles and the recrystallization controlled rolling (RCR) technology realize the grain refinement in V-containing steel.V-N process is a cost-effective way for high strength rebars,forging steels and thin slab direct rolling strips.

关键词： V microalloying precipitation strengthening intragranular ferrite recrystallization controlled rolling

Investigation on Cracking in the Surfacing Welding Layer of Ni_3.l Based Alloy

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Journal of Materials Science & Technology 1994年第5期10卷 347-350页

作者： Guangwei HAN Di FENG and Wujun YE (Dept.5, central iron and steel {3. institute, beijing, 1.0081. china)(To whom correspondence should be addressed) central iron and steel {3. Inst Beijing China

Investigation has been made into the causes of cracking in the Surfacing welding layer of Ni3.l based alloy by analysing both the liqu id-to-solid transformation in the molten pool and the distribution of thermal stress within the surfacing welding layer. The results show that cracking in the surfacing welding layer is directly related to the producing of eutectic phase β' (NiAl) in the interdendritic region and high thermal stress within the surfacing welding layer. When the process of electric arc surfacing welding is changed from along straight line to along' Z' pattern, cracking in the surfacing welding layer of Ni3.l based alloy is prevented due to being reduced of both the cooling rate of liquid in the molten pool and the moving speed of the heat source. Reducing the melting volume of the substrate material by lowering the output power of electric arc welding would make the content of iron atoms in the molten pool decrease. and this also can reduce the trend of the eutectic reaction in the interdendfitic region and is helpful to Suppress cracking in the surfacing welding layer.

关键词： Al Investigation on Cracking in the Surfacing Welding Layer of Ni3.l Based Alloy Ni