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1、金屬工藝考試題（Examinationofmetaltechnology）1,themainrawmaterialsforironsmelting(ironore,fuel,flux)2,thecrystallizationprocessofmetalsisnucleation(nucleation,nucleation,growth,undercooling)3reasonsforchemicalheat(decomposition,absorption,diffusion)4theheattreatmentprocessconsistsof(heating,holding,cooling
2、)5500HBW5/750meansdiameter___mm,materialCarbideballs,Kgf,10-15,Brinell,5006pearliteisamechanicalmixtureof.(ferrite,cementite)The7phasediagramisadiagramoftherelationbetweenreflectionandrelationship.(composition,temperature,tissuecondition)8impuritiesinnonalloysteelsaremainly,,andsoforth.(sulphur,pho
3、sphorus,manganese,silicon)9commoncoolingmedium,suchas,etc..(water,oil,salt,nitratesolution)10chemicalheattreatment,including,suchas,andsoon.(carburizing,nitriding,carbonitriding,Metallizing)11commonquenchingdefectsarewith,with,andwith,andwith.(overheating,overburning,oxidation,decarburization,lacko
4、fhardness,softspots,deformation,cracking)12malleableironisakindofcastironwhichisdecomposedbysomechemicalcompositionandtreatedbyoxidationordecarburization.(whitecastiron,annealed,cementite,flocculent)13ordinarybrassisandconsistsoftwoyuanalloy.(copper,zinc)14,theoverallheattreatmentcanbedividedinto,,
5、etc..(annealing,normalizing,quenching,tempering)15commonquenchingmethodsare,,,.(singleliquidquenching,doubleliquidquenching,isothermalquenching,steppedquenching)16accordingtothetemperingtemperaturedifferencecanbedividedintothreekinds.(mediumtemperaturetempering,lowtemperaturetempering,hightemperatu
6、retempering)17,accordingtotheexistenceofcarbonindifferentforms,castironcanbedividedinto,,,,,.(whitecastiron,greycastiron,malleablecastiron,nodularcastiron,vermicularcastiron,mottledcastiron)Theaustenitetransformationof18steelduringcoolingusuallycanbedividedinto.(isothermaltransformation,continuousc
7、oolingtransition)19,accordingtothecompositionofthesteelandthepurposeofannealing,annealingcanbedividedinto,,,.20mechanicalpropertiesofmetalsinclude,,,,.(strength,hardness,plasticity,toughness,fatiguestrength
