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1、SURFACETHEFASTENERENGINEERINGTREATMENTSDATA&RESEARCHASSOCIATIONfile1HydrogenEmbrittlementAnOverviewfromaMechanicalFasteningsAspectCurrenttrendsinfastenertechnologyareWHATISHYDROGENEMBRITTLEMENT?towardshighstrength,lightassemblies,andfewerfastenersintheoverallconstructi
2、on.WhenatomichydrogenenterssteelandcertainotherCoupledtothisaretheissuesoffriendlyalloys,forexamplealuminiumandtitaniumalloys,environmentalpolicies,plustotalreliabilityinitcancausealossinductilityorloadcarryingeveryrespect.abilityorcracking(usuallyassub-microscopiccrac
3、ks),orcatastrophicbrittlefailuresatappliedAgainstthisbackground,understandingHydrogenstresseswellbelowtheyieldstrengthoreventheEmbrittlementisstillanissueonaglobalscale.normaldesignstrengthforthealloys.Herewehavepresentedthelatestinformation(year2000)that'savailableand
4、canonlyadviseThisphenomenonoftenoccursinalloysthatshowthatgreaterinterestwillensurefullunderstandingnosignificantlossinductility,whenmeasuredbyonthetopic.conventionaltensilestrengths,andisfrequentlyreferredtoashydrogeninduceddelayedbrittlefailure,hydrogenstresscracking
5、orhydrogenINTRODUCTIONembrittlement.IfyousearchforinformationonhydrogenHydrogenisthesmallestatompossibleandistheembrittlementyouareinevitablydirectedtothemostabundantelementintheuniverse.Twodirectorysubjectmatter–corrosion!hydrogenatomscombinetoformamoleculeH2whichisas
6、tablestate.ForhydrogentododamageTherearetwotypesofhydrogenembrittlement;tosteel,itmustbeintheatomicformandusuallyfirstlytheenvironmentaltypewhenitishydrogenrecentlyproduced,callednascenthydrogen.Astheassistedfailureduetothesupplyofhydrogenfromatomissosmall,itcanenterth
7、estructureofsteel.theenvironment,i.e.throughcorrosion.ThesecondThehydrogencanbeintroducedduringheatishydrogenembrittlementfailureduetothetreatment,ascarbonising,cleaning,pickling,processesduringmanufacture.Weshallbephosphating,electro-plating,autocatalyticprocessesaddr
8、essinghydrogenembrittlement,asapplicabletoandintheserviceenvironmentasaresultoffastenersandthecoatingindustries.catho
