多层多道堆焊对中碳调质钢显微组织与力学性能的影响

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1、Abstract一——————————————————————一———————————————————————一。ofweldingse锄decreases，andcolumnarcrystaltransformsintofineequla】【edcrystalinmulti．passbeadweldingsample．ThemicrostructuremorphologyofHAZofmuln-passweldingremainstheSalTleasthatofsingle，layermulti’passweldlng·How州％theM—Avolu

2、mefractionofquenchedzonebecomesloweraRermultl。passbeadwelding’and蓼aduallystabilizes，andaveragelengthofM·Ade盯easesobviously．Multi．passbeadweldinghassignificantinfluenceonmicrohardnessanditsdi矧butioninHAZof45steelasquenchedandtemperedstate·Microh盯dnessofquenchedzonebecomeslower,明dt

3、herehasatendencytobeastableone，andthefluctuationofmicrohardnessdecreasesobviouslyaftermulti--passbeadwelding·Mmti．passbeadweldinghasremarkableimprovementefiecton1mpacttou幽essofHAZ，especiallyofquenchedzone．Impactenergyofquenchedzoneincreasesobviouslyatiermulti-passbeadwelding，butt

4、heincreaseratereducesgraduallywiththelayerandpassofbeadweldingincrease·Itisi11ustratedthat1mpacttoughnessofquenchedzonewon-'t‘changeeVenmallywhenthelayeraIldpassotbeadweldingareuptoagivenvalue．Keyw。rds：rollerpress，heataffectedz。ne，mulfi-passbeadweldin岛mic∞stmctllre，microhardness，

5、impacttoughnessIV目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．III目蜀专⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．i图表清单⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯iv1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一11．1背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

6、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1．1物料的破碎⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1．2辊式破碎机破碎机理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．1．3辊式破碎机磨损机理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯_⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．2辊式破碎机辊面的堆焊修复⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．41．2．1堆焊修复辊式破碎机⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯51．2．2多层多道堆焊⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯61．3焊接热影响区组织及性能⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯61．3．1焊接热影响区组织分布⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯61．3．2焊接热影响区组织转变及特点⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯81．3．3焊接热影响区力学性能⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．101．4焊接热影响区粗晶区脆性的改善⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯111．5研究内容及意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯121．5．1研究内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．121．5．2研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．131．5-3技术路

8、线⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．13目录2试验材料及分