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1、Abstractorganizations,whichleadstothedifferentmechanicsperformance.Inthetensileexperiments,theyieldstrength,tensilestrength,elongationrateofpmwassignificantlyhigherthanthatofthels,lsisslightlyhigherthanthecs.Pmtensilefracturehaveobviousneckingphenomenon,belongstothedu
2、ctilefracture,thereisalotoftougheningnestgroup;thecstensilefracturebelongstobrittlefracture,pores,crackinitiationextension;thelsfractureissimilartocs,butcrackisshorter,lessquantity.Intheimpactexperiments,theparentmetalisthehighestimpacttoughness,heataffectedzoneandwmt
3、heworst;Weldzoneoffractureexistalargenumberofpores,manylongcrackandsmallsecondaryporositydistributionaroundthecrackandheataffectedzoneoffracturehaveparallelcracks,crackdownonbottom,parentmetalfractureevenlydistributedalargenumberoftougheningorganization.Inthehardnesst
4、est,hazgrainprecipitationstrengtheningeffectisbest,thehighesthardness,weld,lowestparentmetal.Useexcosolutiontoresearchtheexfoliationcorrosionbehavioroftheweldedjoints,whichshowsthatthecorrosionpitextendstotheinsidegrainintheweldare.Thepittingcorrosionpitdiameterandint
5、ergranularcorrosionpitwidthlessthantheweldarea.Intheparentmetalarea,lessintergranularcorrosion,pittingcorrosionpitnumber,diameter,after48hgrainwascompletelycorrosion.Thewholespecimenweightlessnessratehadalinearrelationshipandthecorrosiontime,beforethe24h,corrosionquic
6、kly,24hafterexfoliationcorrosionspeedslowdownobviously.Foraccuratecharacterizationofstresscorrosionresistanceofweldingjointsensitivity,slowstrainratetensiletestisusedintheexperiment,whichshowedthatcomparedwithcorrosivemediumbrine,weldfractureinthesiliconeoilwithhighin
7、tensity,longtime,highelongation,elongationatbreak,thatweldstresscorrosioninthecorrosivemediumsalinesensitivitywerehigherthanininertmediumsiliconeoil.TherelativeplasticitylossIscc(δ)ofthecs4.6%higherthanthels,andtherelativebreakingstrengthlossIscc(σ)ofthecs1.1%higherth
8、anthels,whichmeansthatthecsstresscorrosioninthecorrosivemediumsensitivityishigherthanthels.After840hofstresscorrosioninthedo
