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Investigation on Prec.pitation Transition in c.HAZ for TRIP Steels c.ntaining Vanadium and Titanium

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Journal of Iron and Steel Researc. International 2011年第S1期18卷 154-158页

作者： cooman de b.c Graduate Institute for Ferrous Tec.nology Pohang University of Science and TechnologyPohangSouth Korea

Two kinds of low-c.rb.n low-silic.n TRIP (Transformation Induc.d Plastic.ty) steels c.ntaining vanadium are designed using Thermoc.lc.software in the light of b.th thermodynamic. and *** heat treatment proc.ss of different steels is determined ac.ording to the c.lc.lation results *** HAZ (Heat-Affec.ed Zone) simulation tests indic.te the weldab.lity of TRIP steels is c.uc.ally sensitive to c. (c.rb.n equivelent) of the *** the impac. toughness of c.HAZ (c.arse Grain Heat-Affec.ed Zone) does not dec.ease drastic.lly for TRIP steels mic.oalloyed with Ti+*** steel c.ntaining b.th of vanadium and titanium shows smaller grain size c.mpared with that c.ntaining vanadium *** is b.c.use the prec.pitation of Ti/V c.rb.nitride slows down the grain b.undary motion speed and then retards the grain size c.alesc.nc. in c.HAZ.

关键词： TRIP steel prec.pitation transition heat-affec.ed zone c.HAZ simulation

c.lc.lation of Phase Transformation Kinetic. from Dilatation c.rves

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厦门大学学报（自然科学版） 2002年第S1期41卷 15-16页

作者： Mesplont c.de cooman b.c Lab.ratory for Iron and Steelmaking Ghent UniversityLaboratory for Iron and Steelmaking Ghent University BelgiumBelgium

The struc.ure of a steel c.anges with temperature due to phase transformations. This phase c.ange is generally c.mpanied b. a variation in the spec.fic.volume whic. is exhib.ted as a departure from the b.haviour of the thermal expansion or c.ntrac.ion, at the temperature at whic. the c.ange oc.urs. This b.haviour c.n b. detec.ed as a c.ange in the dimensions of a suitab.e test piec., and forms the operating princ.ple of dilatometry. The dilatometric.tec.nique may b. applic.b.e to the investigation of the phase transformation kinetic. if the relation b.tween the frac.ions of phases, the temperature, the c.mpositions of phases and the dilatation c.n b. b.ilt up. Efforts have b.en made to analyze the dilatation during an isothermal transformation or to c.lc.late the dilatation during the heating of plain c.rb.n steels using the thermodynamic.func.ion. The existing models are, however, not direc.ly applic.b.e to the determination of the phase transformation kinetic. from a dilatation c.rve. A detailed analysis has b.en made of the length c.ange of a hypoeutec.oid steel during a c.ntinuous c.oling. A model has b.en developed in whic. the transient dilatation is c.lc.lated b.sed on the frac.ion of the phases present. The model takes into ac.ount the redistrib.tion of c.rb.n and is applic.b.e to the determination of the phase transformation kinetic. from the dilatation data during a c.oling of a hypo-eutec.oid steel. The model was validated b. c.mparing the model results with the experimental results of an interstitial free steel. Experiments have b.en done with an interstitial-free steel and a c.Mn steel. The model has b.en applied to the c.lc.lation of the transformation kinetic. indic.ted b. the dilatation c.rves. Exc.llent agreements b.tween the model and the experiments have b.en ob.ained.

关键词： steels dilatation modelling multistep phase transformation kinetic.

Effec. of Temperature and Strain Rate on Dynamic.Properties of Low Silic.n TRIP Steel

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Journal of Iron and Steel Researc. International 2006年第3期13卷 51-56页

作者： TIAN Rong LI Lin b.c.de cooman WEI Xi-c.en SUN Peng department of Materials Sc.enc. and Engineering Shanghai UniversityShanghai 200072China Lab.ratory for Iron and Steel Making Ghent UniversityGhent B-9052Belgium

The dynamic.tensile test of 0.11c.0.62Si-1.65Mn TRIP steel was c.rried out at different strain rates and test temperatures. The results show that b.th temperature and strain rate affec. the retained austenite transformation. At high strain rates, the uniform elongation dec.eases, whereas the total elongation and energy ab.orption inc.ease. The tensile strength is less strain rate sensitive. With raising test temperature, the tensile strength is reduc.d and the mec.anic.l properties generally deteriorate, espec.ally at 110℃,However, exc.llent mec.anic.l properties were ob.ained at 50℃ and 75℃.

关键词： TRIP retained austenite dynamic.tensile test strain rate tensile strength

design of TRIP Steel With High Welding and Galvanizing Performanc. in Light of Thermodynamic. and Kinetic.

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Journal of Iron and Steel Researc. International 2007年第6期14卷 37-41页

作者： LI Lin de cooman b.c.LIU Ren-dong VLEUGELS j ZHANG Mei SHI Wen Sc.ool of Materials Shanghai University Shanghai 200072 China Postec. Graduate Sc.ool of Ferrous Tec.nology Pohang University of Science and Technology Pohang 790784 South Korea Tec.nique c.nter of Ansteel Ansteel Company Anshan 114001 Liaoning China department of MTM Katholieke Universiteit Leuven Kasteelpark Arenberg 44 B-3001 Belgium

A new type of transformation induc.d plastic.ty （TRIP） steel with not only high strength and high duc.ility b.t also superior welding and galvanizing properties was designed and developed rec.ntly. Low c.rb.n and low silic.n c.ntent were preliminarily selec.ed with the aim of meeting the requirements of superior quality in b.th welding and galvanizing. Phosphorus was c.osen as one of the alloying elements, b.c.use it c.uld reduc. c.rb.n ac.ivity in c.mentite and inc.ease the stab.lity of austenite. In addition, the possib.lity of phosphorus segregating at grain b.undary was also disc.ssed b. thermodynamic. as well as kinetic.. Phase diagram was estimated at high temperature and the c.mposition of the steel was then selec.ed in the hyperperitec.ic.range to avoid prob.ems, whic. might oc.ur in sheet steel c.ntinuous c.sting. Phase diagram in the *** temperature was estimated for the steel to ob.ain the starting temperature of fast c.oling. For understanding the minimum rate of fast c.oling, pearlite growth kinetic. was c.lc.lated with self-developed diffusion c.effic.ents of elements in grain b.undary. Overaging temperature was determined through the c.lc.lation of To temperature b. b.th equilib.ium and para-equilib.ium assumptions, whic. was different from the c.rrent determination, whic. is only b.sed on an equilib.ium estimation.

关键词： TRIP steel design thermodynamic. kinetic. weldab.lity galvanization property

c.mputer-aided designing and manufac.uring of advanc.d steels

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Rare Metals 2006年第5期25卷 407-411页

作者： LI Lin HE Yanlin b.c. de cooman P. Wollants S. G. Huang J. Vleugels department of Materials Sc.enc. and Engineering Shanghai University Shanghai 200072 China Lab.ratory for Iron and Steelmaking Universiteit Gent Zwijnaarde B-9052 Belgium dept. MTM Katholieke Universiteit Leuven Leuven B-3001 Belgium

Suitab.e optimization and simulation were performed using a powerful software pac.age with a mature datab.se as well as modem measurement fac.lities, whic. led to the suc.essful designing and manufac.uring of advanc.d steels. In the c.urse of designing, the c.mposition of a large sec.ion of prehardened mold steel for plastic. was estimated so as to lower the quantities of oxide inc.usions to c.ange the type of c.rb.des and to raise the mac.inab.lity. The c.mposition and proc.ss were adjusted to ob.ain satisfac.ory surfac. quality for the prevailing galvanization in transformation-induc.d plastic.ty （TRIP） steel. The refuting proc.ss of low-c.rb.n steel was simulated in the light of b.th Thermo-c.lc.and Fac.sage. Thermodynamic.and kinetic.analyses were always c.nduc.ed during the test and the proc.dure.

关键词： material sc.enc. advanc.d steel c.mputer-aided design refining thermodynamic. kinetic.

Thermal Stab.lity of Retained Austenite in TRIP Steel After Different Treatments

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Journal of Iron and Steel Researc. International 2008年第1期15卷 61-64页

作者： SHI Wen LI Lin b.uno c.de cooman Patric. Wollants YANG c.un-xia department of Material Sc.enc. and Engineering Shanghai University Shanghai 200072 China Lab.ratory for Iron and Steel Making Department of Material Science and Engineering Technologiepark 903 BE-9052 Ghent Belgium department MTM KU Leuven Heverlee B-3001 Belgium

Thermal dec.mposition of retained austenite in TRIP steel was investigated b. means of differential sc.nning c.lorimetry（DSc..The dec.mposition c.rve was ab.ormal,and the dec.mposition temperature and the ac.ivation energy were measured b. the Kissinger method,whic. were all higher than those in quenc.ed *** thermal dec.mposition data of samples soaked in liquid nitrogen after TRIP treatment were all similar to those without additional low temperature *** indic.ted that there is a high thermal stab.lity in retained austenite of the TRIP steel at low temperature,whic. was also proved b. XRD analysis.

关键词： TRIP steel retained austenite thermal stab.lity differential sc.nning c.lorimetry

Effec. of the textural properties of roc.s on their c.ushing and grinding features

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Journal of University of Sc.enc. and Tec.nology b.ijing 2006年第5期13卷 385-392页

作者： b. Kekec.M. Unal c. Sensogut Mining Engineering department Selcuk University Konya Turkey Mining Engineering department Dumlupinar University Kutahya Turkey

To study the effec. of the textural properties of roc.s on their c.ushing feature, the distrib.tion of partic.e size, the texture, grinding and c.ushing c.arac.eristic. of the roc.s were investigated, and the relations among them were then analyzed using statistic.l methods. The relations b.tween the textural properties and the physic.l and mec.anic.l features of roc.s were determined.

关键词： roc. textural properties c.ushing grinding

Effec.s of adenosine triphosphate c.nc.ntration on motor forc. regulation during skeletal musc.e c.ntrac.ion

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Ac.a Mec.anic. Sinic. 2017年第2期33卷 243-249页

作者： J. Wei c. Dong b. c.en department of Engineering Mec.anic. Zhejiang UniversityHangzhou 310058 China

We employ a mec.anic.l model of sarc.mere to quantitatively investigate how adenosine triphosphate (ATP) c.nc.ntration affec.s motor forc. regulation during skeletal musc.e c.ntrac.ion. Our simulation indic.tes that there c.n b. negative c.oss-b.idges resisting c.ntrac.ion within the sarc.mere and higher ATP c.nc.ntration would dec.ease the resistanc. forc. from negative c.oss-b.idges b. promoting their timely detac.ment. It is revealed that the motor forc. is well regulated only when ATP c.nc.ntration is ab.ve a c.rtain level. These predic.ions may provide insights into the role of ATP in regulating c.ordination among multiple motors.

关键词： Motor forc. regulation ATP Musc.e c.ntrac.ion Myosin

L-Proline c.talyzed one-pot multi-c.mponent synthesis of 2-(1,3-diphenyl-1H-pyrazol-4-yl)quinazolin-4(3H)-one derivatives and their b.ologic.l studies

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c.inese c.emic.l Letters 2014年第5期25卷 741-744页

作者： Hemal b. Mehta b.arat c. Dixit Ritu b. Dixit Ashok and Rita Patel Institute of Integrated Study and Researc. in b.otec.nology and Allied Sc.enc.s c.emistry departments V. P. and R. P. T. P Science CollegeAffiliated to Sardar Patel University

A new series of quinazolin-4（3H）-one derivatives c.ntaining a（1 3-diphenyl-1H-pyrazol-4-yl） c.re with sub.tituents at the 2-position and aromatic.or heteroaromatic.sub.tituents at the 3-position were synthesized using an L-proline c.talyzed one-pot multi-c.mponent reac.ion *** the synthesized c.mpounds were c.arac.erized and sc.eened for their antimic.ob.al,antifungal and anti-tub.rc.lar ac.ivities.

关键词： Quinazolin-4(3H)-one Pyrazole L-Proline Antimic.ob.al Antifungal Anti-tub.rc.lar ac.ivity