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1、第41卷第2期中國激光VoI.41。No.22014年2月CHINESEJOURNALOFLASERSFebruary,2014船用高強鋼E36激光焊接接頭組織和性能的研究賈進楊尚磊。倪維源白建穎丁波/上海工程技術(shù)大學(xué)材料工程學(xué)院,上海201620、\上海交通大學(xué)上海市激光制造與材料改性重點實驗室,上海200240/摘要為了促進船用高強鋼E36激光焊接技術(shù)的發(fā)展,利用YAG激光器對3.2mm厚的E36鋼板進行對接焊接處理。分析了焊接接頭的微觀組織形貌與硬度特性;研究了焊接速度對接頭性能的影響。結(jié)果表明,E36鋼激光焊縫(wz
2、)金屬主要由馬氏體構(gòu)成,其硬度高于母材(BM)。焊接接頭硬度分布不均勻,在焊縫邊緣有著最高硬度;熱影響區(qū)(HAZ)很窄,且硬度急劇下降。隨著焊速變化焊接接頭的性能以及硬度特性也發(fā)生變化:當(dāng)焊接速度達到70mm/s時,焊縫區(qū)域的最高硬度達到448.9HV,為所有試樣中最高,而其熱影響區(qū)硬度值下降最快。在垂直于焊縫的負載下,焊接速度為2O~60mm/s的拉伸試樣均斷裂在母材,而焊接速度為70mm/s的試樣卻斷在熔合線附近,塑性明顯差于斷在母材的試樣。關(guān)鍵詞激光技術(shù);E36鋼;激光焊接;微觀組織;力學(xué)性能中圖分類號TG456.7文
3、獻標(biāo)識碼Adoi:10.3788/CJL2o1441.0203002StudyonMierostruetureandPropertiesofLaserWeldingJointsofMarineHighStrengthSteelE36JiaJinYangShanglei’NiWeiyuanBaiJianyingDingBoCollegeofMaterialsEngineering,ShanghaiUniversityofEngineeringScience,Shanghai201620,ChinaShanghaiKeyLabo
4、ratoryofMaterialsLaserProcessingandModification,ShanghaiJiaoTongUniversity,Shanghai200240,ChinaAbstractItiSimportanttoacceleratethedevelopmentofthelaserweldingtechnologyofmarinehighstrengthsteelE36.Laserbuttweldingof3.2-mmthickE36iSperformedbyusingaYb:YAGlaser.Them
5、icrostructureandhardnessofweldjointsareanalysedandtheeffectsoftheweldingspeedonpropertiesoftheweldjointsarestudied.Theresultshowsthatthemicrostructureofweldzone(WZ)iSmainlymartensite,andthemicrohardnessofWZishigherthanthatofbasemeta1(BM).Thehardnessdistributionofwe
6、ldiointiSnon—uniform.Theweldedgehasanhighesthardness.Heataffectedzone(HAZ)isverynarrowandthehardnessinthiszonedropsquickly.Withtheincreaseoftheweldingspeed,thepropertiesandmicrohardnessalsochange:Whentheweldingspeedis70mm/s,thehighesthardnessoftheWZiS448.9HV,whichi
7、Sthehighestofallthesamples,andthehardnessinitsHAZdropsmostquickly.Thetensilesampleswhichareweldedatspeedfrom20mm/sto60mm/sareallbrokeninbasemeta1.Whentheweldingspeedis70mm/s,thesamplesareallbrokeninfusionlineanditsductilityisobviouslyworsethanthatbrokeninbasemeta1.
8、Keywordslasertechnology;E36steel;laserwelding;microstructure;mechanicalpropertyOCIScodes140.3390;16O.3900;180.5810;350.33901引言主要裝備的戰(zhàn)略性產(chǎn)業(yè),而船舶建造的輕量