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1、金属锻常识类问题（Commonproblemsofmetalforging）1whatisthetemperaturefieldofcasting?Whatisthesolidificationmode?Whatarethethreesolidificationmodesofcastings?Howaboutthefeatures?Answer:thetemperaturefieldofthecasting:thetemperaturedistributionlineonthecrosssectionoft
2、hecastingatthemomentofsolidificationandcooling.Thesolidificationmodeofcasting:layerbylayersolidificationmode,pastesolidificationmode,intermediatesolidification.Layerbylayersolidification:thereisnosolidificationzone,andthesolidificationzonedevelopsfromsurfa
3、cetocenter.Mushysolidification:thesolidificationzoneisverywide,eventhroughtheentirecastingcrosssection,whilethesurfacetemperatureishigherthanthesolidpointTS,thesurfacelayerislessthanTSafterthebeginningofsolidphaseformationofcrusts.Intermediatesolidificatio
4、n:thesolidificationzoneiswider,andrapidlyexpandedtothecastingheart.2whatisthefillingabilityandfluidityofthealloy?Whatistheconnectionanddifferencebetweenthetwo?Howtoimprovethefillingabilityofthealloy?Answer:liquidalloyfilledcavity,toobtainacompleteshape,cle
5、aroutlineoftheabilityofcastingcalledfillingcapacity.Thefluidityofalloysreferstothefluidityofthealloyitself.Thefluidityofthealloyaffectstheinternalfactorsofthealloy,whichismainlyrelatedtothepropertiesofthealloyitself.Thefillingabilitycanbeconsideredastheflu
6、idityofliquidalloyswiththeinfluenceofcastingandotherprocessfactors.Inordertoimprovethefillingabilityofthealloyshouldbechosenineutecticalloyoralloycrystallizationtemperaturerangeofsmall,shouldtrytoimprovethequalityofthesolidificationofmoltenmetal,theliquidm
7、etalispuregascontainedlessimpurities,betterfillingability.3whatisthesequentialsolidificationprincipleandsimultaneoussolidificationprinciple?Whatalloyandcastingstructuralconditionsareapplicable?Answer:theprincipleofsequentialsolidificationistheuseofvariousp
8、rocessmeasures,sothateachpartofthecastinginaccordancewiththeprescribeddirectionfromoneparttoanotherpartgraduallysolidified.Theprincipleisapplicabletoalloycastingssuchascaststeel,highstrengthgrayiron,whichhave
