简介：Compositesarewidelyappliedtothemanufacturingofaircraftinaviation.Formingoflarge-scalecompositecomponentinaircraftrequiresthecorrespondingmoldwithprecisesize.Thelaser-MIGhybridweldinghasasignificantadvantageinthemanufacturingofInvarmoldforaircraftcomposites.Thispapermainlyintroducestheapplicationofthelaser-MIGhybridwelding,andthedistributionofthermalfieldandflowfieldontheInvaralloylaser-MIGhybridthree-layerweldingisanalyzedanddiscussedspecifically.

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简介：Quantitativeresearchontheheataffectedzone(HAZ)ofweavebeadwelding(WBW)jointforInvaralloyiscarriedoutinthispaper.Basedonthemorphologyandrelateddataanalysisoftheweldseam,thewidthdifferenceofeachlayerandtheformingmechanismareanalyzed.Resultsshowthatthebottomlayer(Layer1)hasthewidestHAZandthesmallestfluctuation,whichreaches1200μm.HAZwidthoflayer2to5isrelativelynarrowerwhichisbasicallybelow600μm,whiletheamplitudefluctuationisgreater.Themainreasonliesintheweldingpath.Thelongstraightweldingwithoutweavecausesthebasemetalnearthegroovefullymeltswhichcausesbythelongstraightweldingwithoutweave,whileweldingwithweaveleadstotheunevenandinadequatemeltingofmetalneargroove.

简介：摘要：由于焊接固有的特点, 使得焊接结构焊后存在 较高的焊接残余应力, 它会降低焊接结构的疲劳寿命,从而影响焊接结构的持久可靠使用。殷瓦钢是制造 LNG 船隔热保温层内壁的主要材料。但是殷瓦钢焊接存在工艺窗口窄、焊缝热影响区组织粗大等问题。因此，开展殷瓦钢薄板钨极氩弧焊自动立焊工艺

简介：ThehotductilityofFe-36NiinvaralloywithdifferentadditionsoftheelementceriumwasinvestigatedusingaGleeble-3800thermal-mechanicalsimulatoroverthetemperaturerange850-1050℃,andtheimprovementmechanismofthehotductilitywasanalyzedusingacombinationofSEM,EDS,andOM.TheresultsindicatedthatFe-36Niinvaralloyexhibitedpoorhotductilitybelow1050℃,whichwasmainlyattributedtoweakgrainboundariesandtheactionofgrainboundarysliding.However,thealloyswithceriumcontentsof0.016%and0.024%bothdemonstratedsubstantialimprovementinthehotductilityovertheentiretestingtemperaturerange.Theobservedimprovementofthehotductilityofthealloywith0.016%ceriumat950℃andthealloywith0.024%ceriumat900℃wasassociatedmainlywiththegrainboundarystrengtheningandtherestrictionofthegrainboundaryslidingbecausetheadditionofceriumreducedthesegregationofsulfuratgrainboundariesandrefinedthegrainstructure.Theoccurrenceandaccelerationofdynamicrecrystallizationwerefoundtoberesponsibleforthehighhotductilityofthealloywith0.016%ceriumat1000℃andthealloywith0.024%ceriumat950-1000℃asaresultoftherefinementofthegrainstructurebyadditionofcerium.

简介：TheeffectofCe,LaandmischmetalonthesolidificationstructureofFe-36Niinvaralloywasinvestigated.Theresultsshowthatgreatamountsofhigh-meltingpointcompounds(Ce2O3,La2O2Sand(Ce,La)2O2S)respectivelyformedinthealloywiththeadditionofCe,Laormischmetal.Basedonthetheoryoflatticemisfit,thelatticemisfitbetweenthe(0001)surfacesofCe2O3,Ce2O2SandLa2O2Sand(100)surfaceofFe-36Niinvaralloywere6.21%,5.77%and5.42%,respectively,whicharerelativelylow.Therefore,Ce2O3,La2O2Sand(Ce,La)2O2Scouldserveasthecoreofheterogeneousnucleation,improvetheequiaxedgrainratio,reducetheequiaxedgrainsizeandrefinethesolidificationstructureofalloy.

简介：ThispaperintroducesabrazingprocessbetweenAl_2O_3ceramicandInvaralloy.Al_2O_3canbebrazedwithInvareffectively.TheinterfacialstructureofAl_2O_3/Invarjointcanbeexpressedas:Invar/Ag(s,s)+Cu(s,s)+Fe_2Ti(zoneⅠ)/Ag(s,s)+Cu(s,s)+Fe_2Ti+NiTi+Cu_3Ti(zoneⅡ)/Ag(s,s)+Cu(s,s)+Cu_2Ti+Al(s,s)+TiC+TiO(zoneⅢ)/Al_2O_3.Themaximumshearstrengthof139MPawasmeasuredforas-brazedAl_2O_3/Invarjointbrazedat850℃for25minor900℃for15min.

简介：摘要由于Invar钢热膨胀系数与树脂基碳纤维复合材料相接近，使用Invar合金钢代替传统的模具材料生产大型复合材料制件，可以大大降低模具因素导致的复合材料应力不均匀分布引起的固化变形。本文对于模具在零件制造中，常因模具使用不当或使用环境剧烈变化而引起表面产生众多缺陷，从而致使整套模具的报废，使模具消耗量巨大。为减少模具的制造数量，节约Invar合金的消耗量，可采用冷焊技术进行修复，从根本上恢复或者提高了原模具的结构和使用性能。

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简介：基于传统双辊铸轧工艺将固态因瓦合金(Invar)带材与熔融态铜液同时喂入铸轧机辊缝,在铸轧区高温、强压和塑性变形共同作用下,成功制备Invar/Cu层状复合带材。通过拉伸、弯曲、T型剥离及SEM、EDS测试,分析Invar/Cu复合带材的力学性能及拉伸断口和结合界面显微形貌。结果表明,折弯中覆层与基层协调变形,未出现分层现象;当界面结合强度较高时,拉伸应力-应变曲线只有一个应力平台;相反,由于Invar和Cu的力学性能差异,在等轴拉伸过程中出现界面分层现象,在两组元发生缩颈时,应力-应变曲线相应地出现两个应力平台;经800℃热处理1h,平均剥离强度由铸轧态的13.85N/mm提升至42.31N/mm;并且,退火处理后Cu侧剥离界面SEM和EDS结果证明,Cu侧黏连有更多的Fe,这说明退火处理可以增强Invar/Cu复合带材的界面结合强度。