EPR法評價晶粒尺對奧氏體不銹鋼晶間腐蝕敏感性的影響.pdf

1、蘭州理工大學碩士學位論文EPR法評價晶粒尺對奧氏體不銹鋼晶間腐蝕敏感性的影響姓名：何燕妮申請學位級別：碩士專業(yè)：安全技術及工程指導教師：俞樹榮20120612EPR法評價品粒尺寸對奧氏體不銹鋼品問腐蝕敏感作的影響AbstractAsanadvancedmaterialsjoiningtechnologydiffusionbondinghasbeenwidelyusedinaerospaceandnuclearpowerindustrie

2、srecentlyDiffusionbondinghartattractedextensiveattentioninpackageinMicro—chemicalMechanicalSystemsAusteniticstainlesssteelsarepreferablyselectedformanufacturingmicroheatexchangersandmicro—reactorsduetoitsexcellentcorrosi

3、onresistanceandgoodmechanicalpropertiesBecauseofcorrosionmediuminMicrochemicalmechanicalsystemandeffectofvacuumdiffusionbondingprocessoncorrosionpropertiesofausteniticstainlesssteels，itisthereforeessentialtoinvestigateco

4、rrosionbehaviorofthediffiongbondedjointsofausteniticstainlesssteelsforbothoptimizationofbondingparametersandreliablepackageofengineeringstructuresElectrochemicalPotentiokinetieReactivation(EPR)isgenerallyusedtoevaluating

5、ofintergranularcorrosionausteniticstainlesssteelsItiSnondestructive，rapidandquatitetivebehaviorandCanbeusedforindustrialonsiteinspectionofmaterialsensitivitytointergranularcorrosionThemaincontentsofthearticleareasfollows

6、：(1)Differenttimesofsolutiontreatmentson1100℃hasbeenconductedon3l6LausteniticstainlesssteelcrudematerialsTheexperimentalresultsshowthat：withthetimelongerthegrainsizesofaustenisticsteelbiggeraftersolutiontreatmentson1l00℃

7、，theprocessofsolutiontreatmentsfromhalfanhourtothreehours，thesizesofgrainschangedevidently；comparedtothepurematerial，theaveragegraindiametersincreasedfrom461xmto551xmonlyacrosshalfanhourThesignificantgrowthofgrainsCanbeo

8、bservatedbythemetallographicelectronmicroscopeon200X，applicatingthegrainratingsoftwareofmetallographicelectronmicroscopeforassessingtheaveragegrainsizesareasfollowed：55肛m(1100。C／05h)、771am(1100。C／1Oh)、89tm(1100。C／15h)、11

9、0Itm(1100“C／2Oh)、145pm(1100“C／25h)，173Itm(1100C／3Oh)(2)Thesensitizationtestsareconductedon316LSSdiffusionbongdingjointsandpurematerialsaftersolidtreatmentunderthesameconditionTheexperimentalresultsshowthat：underthesamese

10、nsitizationtreatmenttime，astheholdingtime，theprecipitatesonsolidedmaterialssamplebecameclearwiththetimelongerWhenthesensitizationtimewasextendedto100hours，observedofthegrainboundaryscatteredprepicitates；Comparedtothepure