Ti对低合金高强钢大热输入焊缝夹杂物的影响.pdf

《Ti对低合金高强钢大热输入焊缝夹杂物的影响.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、第5O卷第8期机械工程学报Vo1．5ONO．82014年4月JOURNALOFMECHANICALENGINEERINGApr．2014DoI：10．3901／JME．2014．O8．034Ti对低合金高强钢大热输入焊缝夹杂物的影响木阿荣乔建设2李建萍潘川田志凌f1．中国钢研科技集团有限公司北京100081；2．江苏金陵船舶有限责任公司仪征211402；3．上海船厂船舶有限公司上海200082)摘要：对不同Ti质量分数的低合金高强钢气电立焊焊缝夹杂物进行对比分析，并研究焊缝夹杂物数量、分布、类型对焊缝组织的影响。结果表明，当Ti质量分数由0增加至O．028％~0．038

2、％范围内时，夹杂物得到有效细化，尺寸小于2m的夹杂物比例大幅度提高，促进了针状铁素的形核。当Ti过量时，小于2岬的夹杂物比例迅速降低，贝氏体转变成为主导。夹杂物中心以氧化物为主，外层包裹物为MnS。随着质量分数的增加，夹杂物中Mn、Si等元素减少，Al、Yi、O质量分数增加，夹杂物中心的氧化物以MnO、SiO2、A12O、MgO的次序逐渐转移至边缘，最终被TO取代。此过程中，夹杂物由Mn．Si一0转变为Ti．Mn．A1—0，最后转变为Ti—A1．O，并且对于针状铁素体形核而言，完成了无效夹杂物一有效夹杂物一无效夹杂物的转变。关键词：大热输入焊接；Ti；焊缝组织；夹杂物；

3、针状铁索体中图分类号：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％．andacicularferriteintheweldsiSobviouslypromotedowingtothesignificantlyincreasedpercentageoftheinclusionswithasizesmallerthan2gm．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