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1、Heattreatmentheattreatmenttermthismeanvariousthroughheatandcoolinordertochangemetalcourseofcharacteristic.Throughtheappropriateheattreatment.Canmakethemetalobtainacertainproperty,forexample;Hardness,tensilestrength(resisttheabilitytodraw)andtoughness,theheattreatmentcanbeakindof
2、simplecraftthatonlyneedsafewtools.Herecommercially,theheattreatmentisheightscience,complicatedcourseofdemandingtohavealotofapparatus.Themachinehadnouseornotusefultoaddbyalotofproductsorproductsproducedinworkshopatalluntilheat-treating.Theoriginalmeaningonlyinvolvesthemostbasickn
3、owledgeoftheheattreatmentaboutsteel.Canheat-treattoalotofnonferrousmetalssuchasaluminum,copperandbrass,butitscourseofcraftisdifferent,omittomentionhere.Thesteelheattreatmentmethodincludesquenching,flashback,annealsandtheshellisquenched.Quench,quench,heatsteelthencoolbyraisinghis
4、hardness,tensilestrength,reduceitstoughnesswellobtaindetailedcrystallinegrainorganizemethod.Thiscourseincludesheatingtothemetalitscriticalpoint,i.e.theabovecriticaltemperaturethencoolsrapidly.Withtheheatingofthesteel,thephysicalchangeandchemicalchangetakeplacebetweenironandcarbo
5、n.Criticalpoint,i.e.criticaltemperature,isthatthesteelhasthemostidealtemperatureofcharacteristics.Reachtemperaturethis(circlebetween1400600F)assteel,coolrapidly,toobtainhardhighstrengthmaterialveryidealchangethis,ifmetalcoolingslowly,itwillchangeandgetbacktoitsoriginalstate.Thro
6、wpeoplewater,oilorbrineblazingmetal(quench),canmakethecharacteristicneededtoconformwithmaintain.Inthiswaythemetalbecomesveryhard,theintensityisveryhigh,andtoughnessisworsethaninthepast.Heatingtogooninthestoveinheatsourcewithgas,oil,electricity.Containaninstrumentwhichiscalledthe
7、pyrometeronthestove.Itcanrecordtheactualtemperatureinthestoveaccurately.Canalsodecidemetaltemperaturethroughobservingmetalcolor•Canutilizethesecolorstosimplemetalpartandtoolwhileheat-treating.Butthecolorisnotveryaccurate.Skilledheattreatmentworkertemperaturewitherrorofrealtemper
8、aturehappenedtoobservecanreach200Fmoretoobythis
