different temperatures on the heat bonding strength of process connections
increase,nucleation rate increases.on the other hand,the initial generation of af nucleation or grain at a lower temperature to further grow.the combined effects of both,making the score a rapid increase in the precipitation of af.af phase transition in the late phase transformation driving force,although the decrease with temperature increase.however,the carbon **s at low temperature greatly reduced diffusion capacity,making the af transition in the nucleation and the nucleation and growth are subject to certain restrictions.in addition,the precipitation of a large number of af,so the carbon content of residual austenite greatly increased,further increase the stability of austenite,af consequent shift also difficult.so in the late phase fraction increased precipitation slow af.when the temperature dropped to a critical temperature below a short range diffusion of carbon **s only.at th** time.af of the nucleation and growth are not possible,the end of phase transitions.the critical temperature ** the temperature af phase terminates.4 conclusion(1)phase transition temperature of the weld in the af range 668~541 ℃.(2)af phase transition ** typical of diffusion phase transition.af phase transition ex**ts incubation period,as the heat input increases,the incubation period increased.(3)af phase transition kinetics ** not complete(4)with the increase of heat input,weld metal content increased in the af,when the heat input increased to a critical value,af levels began to decrease.(5)af phase transition of a curve and f-t curve showed a(6)with the increase of heat input,af phase transition towards the high temperatures.references:[1]lv delin.welding metallographic analys**[m].beijing:china machine press.[2]yang liu,liu shikai.fe-c-si-mn alloy bainitic transformation dynamics calculation[j].materials science,1993,29(1):al-a5.[3]lin hu.metal science and heat treatment[m].xi'an:northwest industry university press,1994.[4]zhang deqin.micro-alloy steel weld metal acicular ferrite formation mechan**m of[d].tianjin:tianjin university,moncler jackets,2000.about the author:yun shao hui,female,born in 1973,phd,lecturer.engaged in welding metallurgy research work,**s publ**hed than l0.email:yunshaohui@s0hu.oom[on the next page 26]cmos[j].ieeetransactionsoncomponents,moncler homme,hybrids,andmanufacturingtechnology,1991,14(4):855-858.[3]farhadfarassat.wirebondingpro42esscontrol[eb/ol].ht-tp:/www. semiconductorfabtech.com. 2003.[4]meddingj,mayerm.insituballbondshearmeasurementusingwirebonderhead[a].ieee/cpmt/semi,28thinternationalelectronicsmanufacturingtechnologysymposium[c],2003,59-63.[5]rammingers,seligern,wachutkag.reliabilitymodelfora1wirebondssubjectedtoheelcrackfailures[j].microelectronicsreliability,2000,4 o(8):1521-1525.[6]hou zengshou,lu guangxi.principles of metal[m].shanghai:shanghai science and technology press.1990.[7]huai-zhi,ning yuantao.gold[m].changsha:central south university press.2003.[8]kangf,williamspm,mclarents,a1.studiesofther-mosonicbondingfqrflip-chipassembly[j].materialschem**tryandphysics,1995,magasin moncler,42(1):3l a 37.about the author:takashi force,male,born in july 1976,ugg boots günstig,central south university,goedkope uggs,a ph.d.,lecturer.mainly engaged in electronic packaging technology and equipment research,publ**hed articles l0.email~longzhili@mail.cbu.odu.cn
相关的主题文章：
kinetic spectrophotometric determination of palladium_2105
laser cladding(zr+wc)fecsibre alloy microstructure and properties of_402
moncler prix functional materials with a cutting t 展开