掺杂钨带的退火行为分析

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1、硕士学＆论立胞构成，退火过程中条形胞转变为条形亚晶，然后在横向界面(横向亚晶界)张力的作用下亚晶发生粗化，进而形成再结晶核心。(6)结合实验规律与实际生产条件，研究认为螺线管的去应力退火规范为：初次定形退火：1450℃，25min；二次完全去应力退火：1500℃，15h，退火时需密封保护。关键词行波管，钨带，回复再结晶，去应力退火ABSTRACTTheinfluancesofdifierentannealingconditionson】ecoveryandrecrystallizationofdo

2、pedtungstenwirewerestudiedTheinfluencingfactorcontainsannealingatmosphere，temperatureandtimeMicrostructuralevolution，whichtakenplaceduringrecovering，primary,recrystallizationandsecondaryrecrystallization，andtheinfluenceofdopedKonthesechanges，wereobser

3、vedAccordingtothoseobservations，themechanismofprimaryrecrystallizationandthemodeofsecondaryrecrystallizationwerepresented．HardnessbendperformancechangesduringannealingwereassessedItfollowedthat：(1)ifFeelementexistintheannealingatmosphere，itwillmakethe

4、dopedtungstenwirerecrystallizationat800。CIftheannealingatrnnspherecontainsC，tungstenwiregetbrittleafterannealingat1200ECIncreasingthe0contentinannealingatmospherewilldecreasingCcontent，whichcaneliminatethebrittlenesscausedbyCtheN2contentinatmospherewi

5、llmaketungstenwirerecrystallizationat15005C(2)whenannealedinvacuum，thedopedtungstenshowedexcellentrecrystallzationresistanceTherewerelittlemicrostructuralchangeswhenitwasannealedbelow1200℃TEMobservationdemonstratethatnothingchangedexceptforthedecreasi

6、ngofdislocationdensityandthecoarseningofsubgrainAfterannealedbetween1200℃～1600℃．dopedtungstenwirerecrystallisedAfter1700。C，secondaryrecrystanizationhappedinthesurfaceoftungstenwire，whileitremainedthefibrousgrainsinthecenterofwireAfter1800。C，secondaryr

7、ecrystallizationhappenedoverallinthetungstenwire(3)Hardnessexperimentdemonstratedthathardnessoftungstenwirechangedalittlebeforesecondaryrecrystallization，becausebeforesecondaryrecrystallization，rnicrostructureoftungstenwirexN'asconsistedbysmallsubgrai

8、n，whichmadethefine-grainedstrengthening．Bendingexperimentdemonstratedthatiftherewerenoimpuritiesexistedinannealingatmosphere，primaryrecrystallizationwon’tmakethetungstenwirebrittlebecausethefibrousstructurewasretainedafterprimaryrecrystallizat