astm4130钢焊接接头组织与性能分析

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1、、’IntheMax．hardnesstestofweldingHAZ，Max．hardnessvalueofHAZpresentstothevicinityofweldinterface，whichachievesatroomtemperature，duedtotheformationofbrittlemartensite，reaching566I--IVl0．Thepeakvaluesreduceto455"--490HVloafterpreheatingat150"C，200"Cand250"C，whichdroptO345HVIoat300"C．Testingprovedthatpr

2、eheatingcalleffectivelydecreasethecontentofhardeningstructure，relievingthesensitivityofASTM4130steel．Thecoarse—grainHAZs，whichareintheimplanttestandMax．hardnesstestofweldingHAZ，consistspredominantlyofmartensiteandbainite．Themicrostructuresofweldmetalasweldedareacicularferriteandasmallamountofpearli

3、te，andwhichofHAZaremartensite，ferriteandbainite．AfterPWHT,themicrostructureofweldmetalconsistspredominantlyofferrite，asmallamountofpearliteandgranularcarbide，whichofHAZarecomprisedoftemperedsorbite，ferriteandbainite．Thecarbidegraduallyprecipitatesandthestructurebecomesfineasprolongingthesoakingtime

4、．Withprolongingthesoakingtime，thetensilestrengthvaluesincreasefirstandthendecrease，andthehardnesslevelsofweldmetalhavealittlechange，whilewhichofHAZandbasematerialgraduallyreduce．Maximumhardnessvaluepresentstothevicinityofweldinterface．Thehardnessvaluesreducegraduallyasincreasingthedistancefromweldi

5、nterface，reachingminimumvaluenearby3"一4mmfromweldinterface，andthereisanobvioussofteningphenomenoninHAZ．Theimpacttestresultsshowthatweldandfusionzonearetheweakestpartsofweldedjoints，andthevaluesoffusionlinetendtofluctuatewildly．Basematerialshavethehighesttoughness．ThereisthusagoodimprovementintheHAZ

6、toughnessinspiteofminorchangesinweldandfusionlineasprolongingthesoakingtime，relatedtothereductionofcoarsenedphasesandupperbainiteinthemicrostructure．Keywords：ASTM4130steel，Preheat，Post—weldheattreatment，Weldedjoints，MicrostructuresandpropertiesIII、＼目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1课题意义⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2中碳调质钢焊接性分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．3国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．3．1中碳调质钢焊接研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．3．24130钢焊接研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯61．3．3焊接接头强韧化研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯