TC4钛合金激光增材修复工艺及性能研究.pdfVIP

HotWorkingTechnology2020,Vol.49,No.23

TC4钛合金激光增材修复工艺及性能研究

应俊龙，巢昜轩，熊曦耀

(航空工业集团昌河飞机工业集团，江西景德镇330034)

摘要：激光修复工艺可实现TC4关键零件失效后的增材再制造及延寿使用，将大大缩短生产周期、降低制造成

本。开展TC4钛合金激光修复多参数工艺试验，研究了激光功率、扫描速度、送粉速率、搭接率对修复表面形貌、抗拉强

度的影响。在激光功率2400W、扫描速度240mm/min、送粉速率16g/min、搭接率45%时，可以获得良好的力学性能及

表面质量的修复层，试样的抗拉强度优于TC4基体的。分析了修复区的金相组织及断口形貌，其拉伸断口均表现为塑

性断裂；金相组织观察结果表明，基体与修复区平滑过渡，具有良好的冶金结合。

关键词：激光修复;TC4钛合金；抗拉强度；塑性断裂;冶金结合

DOI:10.14158/j.cnki.1001-3814.

中图分类号：TG146.23;TG456.7文献标识码：A文章编号：1001-3814(2020)23-0118-04

LaserAdditiveRepairingTechnologyandPropertiesofTC4TitaniumAlloy

YINGJunlong,CHAOBingxuan,XIONGXiyao

(AviationIndustryGroupCompanyChangheAircraftIndustriesCorporation,Jingdezhen330034,China)

AbstractLaserrepairingtechnologycanrealizetheremanufacturingandlife：extensionofTC4keypartsafterfailure,

anditwillgreatlyshortentheproductioncycleandreducethemanufacturingcost.Multi-parameterprocesstestsoflaserrepair

ingofTC4titaniumalloywerecarriedout,andtheeffectsoflaserpower,scanningspeed,powderfeedingrateandlaprateon

thesurfacemorphologyandtensilestrengthofTC4titaniumalloywerestudied.Whenthelaserpoweris2400W,thescanning

speedis240mm/min,thepowderfeedingrateis16g/minandthelaprateis45%,therepairlayerwithgoodmechanical

propertiesandsurfacequalitycanbeobtained,thetensilestrengthoftherepairedsampleisbetterthanthatofTC4matrix.The

microstructureandfracturemorphologyoftherepairedareawereanalyzed.Thetensilefractureisplasticfracture.The

metallographicstructureobservationresultshowsthatth