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1、严超西北工业大学硕卜论义ABSTRACTAsagrainrefinementtechniqueofoutsidephysicalfield,electricmodificationtreatmentisresearchedbyalotofphysicistandmetallurgistatdomesticandoverseas.Ithasanimportantefectonmanufacturingfinishedproductsandsemi-finishedproducts.Atthesametime,i
2、tforeshowshugemarketforeground.Strongelectricpulseintegratingwithfoundrytechniquemightproduceanewprocess,whichcanrefinethegrainsizeandimprovetheformingqualityofcastings.Inthiswork,wemadeapulsegeneratorwithhighvoltage(themaximalvoltage2.5KV)andhugecurrent(th
3、emaximalpeakvalue1.7MA)byourselves,XJDMC-1electricpulsegeneratorequipment.Itiseasytocontrolandcanadjustthechargevoltage,depositedenergycapacity,chargeanddischargetime.Besides,thevoltageandtimecanbedisplayedthroughLED.Twoschemesofcontrolsystemweredesignedand
4、made.Oneistotalhardwarecontrol;theotherisrealizedthroughtheAT89C51singlechipcontrolboard.Thesecondcanrealtimecontrolchargeanddischargeswitchesexactly.Theformerisusedsimply,whichisrangingbetween0.2sand9.90s;thelatterisusedaccurately,whichisrangingbetweenlmsa
5、nd9990ms.Theexperimentresultsproofthattheperformanceofequipmentcansatisfytheneedsofscientificresearchandrealproduction.ThesandmouldandplastermouldofcastingalloyAl-4wt%CuandindustrializationalloyZL102wereelectricmodificationtreatedbyusingtheself-madeXJDMC-1e
6、lectricpulseequipment.Efectsofthecharacteristicparameterofelectricpulseonthemicrostructuresandthemechanicalpropertiesofalloyswerestudied.Theresultsshowthatunderthecertainpourtimesofelectricpulse,thehighstrengthelectricpulsehastheefectstoimprovethesurfacequa
7、lityofcastings,decreasethecastingdefect,andrefinethegrainmicrostructure.Theaveragegrainsizecanberefinedtomicron.Inaddition,themethodcanimprovethemechanicalpropertiesofcasting,suchastheelongationandintensity.Theyincreased50%and21.5%respectively.Sousingoptimi
8、zationparametersofelectricmodificationtreatmentprocess,canachievetheefectoftraditionalNaalterative.Keyword:electricmodificationtreatment,electricpulseequipment,controlsystem,foundryalloy,grainrefinemen