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1、第5O卷第8期機(jī)械工程學(xué)報(bào)Vo1．5ONO．82014年4月JOURNALOFMECHANICALENGINEERINGApr．2014DoI：10．3901／JME．2014．O8．034Ti對(duì)低合金高強(qiáng)鋼大熱輸入焊縫夾雜物的影響木阿榮喬建設(shè)2李建萍潘川田志凌f1．中國鋼研科技集團(tuán)有限公司北京100081；2．江蘇金陵船舶有限責(zé)任公司儀征211402；3．上海船廠船舶有限公司上海200082)摘要：對(duì)不同Ti質(zhì)量分?jǐn)?shù)的低合金高強(qiáng)鋼氣電立焊焊縫夾雜物進(jìn)行對(duì)比分析，并研究焊縫夾雜物數(shù)量、分布、類型對(duì)焊縫組織的影響。結(jié)果表明，當(dāng)Ti質(zhì)量分?jǐn)?shù)由0增加至O．028％~0．038
2、％范圍內(nèi)時(shí)，夾雜物得到有效細(xì)化，尺寸小于2m的夾雜物比例大幅度提高，促進(jìn)了針狀鐵素的形核。當(dāng)Ti過量時(shí)，小于2岬的夾雜物比例迅速降低，貝氏體轉(zhuǎn)變成為主導(dǎo)。夾雜物中心以氧化物為主，外層包裹物為MnS。隨著質(zhì)量分?jǐn)?shù)的增加，夾雜物中Mn、Si等元素減少，Al、Yi、O質(zhì)量分?jǐn)?shù)增加，夾雜物中心的氧化物以MnO、SiO2、A12O、MgO的次序逐漸轉(zhuǎn)移至邊緣，最終被TO取代。此過程中，夾雜物由Mn．Si一0轉(zhuǎn)變?yōu)門i．Mn．A1—0，最后轉(zhuǎn)變?yōu)門i—A1．O，并且對(duì)于針狀鐵素體形核而言，完成了無效夾雜物一有效夾雜物一無效夾雜物的轉(zhuǎn)變。關(guān)鍵詞：大熱輸入焊接；Ti；焊縫組織；夾雜物；
3、針狀鐵索體中圖分類號(hào)：TG401EffectsofTitaniumonInclusioninHighHeatInputWeldsofHighStrengthLowAlloySteelARongQIAOJiansheLIJianpingPANChuanTIANZhiling(1．ChinaIron&SteelResearchInstituteGroup，Beijing100081；2．SINOTRANS&CSCJiangsuJinlingShipyardCo．，Ltd．，Yizheng211402；3．ShanghaiShipyardCo．，Ltd．，Shanghai20
4、0082)Abstract：Diferentnon-metallicinclusionsinelectrogasweldscontainingvarioustitaniumcontentsarecomparedandtheeffectsoftheirnumber,distributionandtypeareinvestigatedaswellforhighstrengthlowalloy(HSLA1stee1．Theresultsindicatethattheinclusionsareeffectivelyrefinedwiththetitaniumcontentsra
5、ngedin0．028％一0．038％．a(chǎn)ndacicularferriteintheweldsiSobviouslypromotedowingtothesignificantlyincreasedpercentageoftheinclusionswithasizesmallerthan2gm．However，thepercentageoftheinclusionswithasizesmallerthan2LLmiSdramaticallydecreasedwiththeexcessiveadditionoftitaniumintheweldsanditresultsi
6、nbainitetransformation．ItisalsoconfirmedthattheinclusionsintheweldmetalsmainlyconsistsofoxidesinthecoreandMnScoatedoutside．Manganeseandsiliconlevelsaredecreased．whereasaluminum．titaniumandoxygenareincreasedintheinclusionswithtitaniumaddition．Asaresult，oxidesinthecoreareexpelledtotheedges
7、inallorderofMnO，SiO2，A12O3，MgO，andfinallyreplacedbyTixOy．Therefore．theinclusiontypesaretransformedfromMn—Si—OwithouttitaniumtoTi—Mn—Al-OandfinallytoTi—Al—Owithexcessivetitaniumaddition．Theinclusionsaresuferingtheprocessingfromineffeetivetoeffectiveandthentoinetiectivewith
