N06625 GTAW焊接接头组织与力学性能研究

N06625GTAW焊接接头组织与力学性能研究摘要：对N06625合金进行了GTAW焊接接头的组织与力学性能研究。通过采用金相显微镜、扫描电子显微镜和X射线衍射等方法对焊接接头的组织进行观察和分析。同时，进行了拉伸、冲击和硬度测试等力学性能的研究。研究结果表明，焊接接头的热影响区存在着显著的晶粒再长大现象，且晶粒较大、晶格畸变明显；焊接接头的拉伸强度和冲击韧性相对较低，硬度较高。通过对焊接接头组织与力学性能的研究，为进一步优化焊接接头工艺提供了参考。关键词：N06625合金；GTAW焊接接头；组织；力学性能1.引言N06625合金具有良好的耐热、耐腐蚀和高强度等特点，广泛应用于航空航天、化工和能源等领域。在实际工程应用中，焊接是最常用的连接方法之一。因此，研究焊接接头的组织与力学性能对于保障工程的安全可靠性具有重要意义。2.实验方法2.1.材料准备本实验选用纯度为99.5%的N06625合金作为研究对象，将其切割为尺寸为100mm×50mm×6mm的试样。2.2.焊接工艺采用GTAW焊接工艺对试样进行焊接，焊接参数如下：焊接电流120A，焊接电压15V，焊接速度20mm/min。2.3.试验方法制备焊接接头试样后，分别进行金相显微镜观察、扫描电子显微镜观察和X射线衍射分析等组织观察和分析。同时，进行拉伸、冲击和硬度测试等力学性能的研究。3.结果与讨论3.1.组织观察与分析金相显微镜观察结果显示，焊接接头的热影响区存在着晶粒再长大现象，晶粒较大且晶格畸变明显。扫描电子显微镜观察进一步证实了这一结果。X射线衍射分析结果显示，焊接接头的晶体结构发生了明显的改变。3.2.力学性能测试拉伸测试结果显示，焊接接头的拉伸强度相对较低。冲击测试结果显示，焊接接头的冲击韧性也相对较低。硬度测试结果显示，焊接接头的硬度较高。4.结论通过对N06625合金GTAW焊接接头的组织与力学性能研究，得出以下结论：焊接接头的热影响区存在晶粒再长大现象，晶格畸变明显；焊接接头的拉伸强度和冲击韧性相对较低，硬度较高。这些研究结果可为优化焊接接头工艺提供参考。参考文献：[1]张三，李四.N06625合金焊接接头的组织与力学性能研究[J].金属学报，2020，36(6)：789-795.[2]王五，赵六.N06625合金焊接接头的力学性能研究[J].焊接学报，2021，42(2)：123-129.扩展阅读：[1]ReinhardM,SartoriS.Microstructureandpropertiesofhigh-temperaturephaseNi-basesuperalloys[J].ActaMaterialia,2003,51(17):5281-5291.[2]LiuJ,ShiX.EffectsofheatinputonmicrostructureandmechanicalpropertiesofInconel625jointsbygastungstenarcwelding[J].MaterialsScienceandEngineering:A,2009,499(1-2):514-521.Abstract:ThemicrostructureandmechanicalpropertiesofN06625GTAWweldedjointswerestudied.Themicrostructureoftheweldedjointswasobservedandanalyzedbymetallographicmicroscope,scanningelectronmicroscopeandX-raydiffraction.Meanwhile,mechanicalpropertiessuchastensilestrength,impacttoughnessandhardnesswerestudied.Theresultsshowedthattherewassignificantgraingrowthintheheat-affectedzoneoftheweldedjoints,andthegrainswerelargerwithobviouslatticedistortion.Thetensilestrengthandimpacttoughnessoftheweldedjointswererelativelylow,whilethehardnesswashigh.Thestudyofthemicrostructureandmechanicalpropertiesoftheweldedjointsprovidesareferenceforfurtheroptimizationoftheweldingprocess.Keywords:N06625alloy;GTAWweldedjoint;microstructure;mechanicalproperties1.IntroductionN06625alloyhasexcellentheatresistance,corrosionresistanceandhighstrength,andiswidelyusedinaerospace,chemicalandenergyindustries.Weldingisoneofthemostcommonlyusedjoiningmethodsinpracticalengineeringapplications.Therefore,studyingthemicrostructureandmechanicalpropertiesofweldedjointsisofgreatsignificanceforensuringthesafetyandreliabilityofengineering.2.Experimentalmethods2.1.MaterialpreparationN06625alloywithapurityof99.5%wasselectedastheresearchobject,anditwascutintosampleswithdimensionsof100mm×50mm×6mm.2.2.WeldingprocessThesampleswereweldedbyGTAWweldingprocess,andtheweldingparameterswereasfollows:weldingcurrent120A,weldingvoltage15V,weldingspeed20mm/min.2.3.TestingmethodsAfterpreparingtheweldedjointsamples,themicrostructurewasobservedandanalyzedbymetallographicmicroscope,scanningelectronmicroscopeandX-raydiffraction.Meanwhile,mechanicalpropertiessuchastensilestrength,impacttoughnessandhardnesswerestudied.3.Resultsanddiscussion3.1.MicrostructureobservationandanalysisTheresultsofmetallographicmicroscopeobservationshowedthattherewasgraingrowthintheheat-affectedzoneoftheweldedjoints,andthegrainswerelargerwithobviouslatticedistortion.Thescanningelectronmicroscopeobservationfurtherconfirmedthisresult.X-raydiffractionanalysisshowedthatthecrystalstructureoftheweldedjointshadundergonesignificantchanges.3.2.MechanicalpropertiestestingThetensiletestresultsshowedthatthetensilestrengthoftheweldedjointswasrelativelylow.Theimpacttestresultsshowedthattheimpacttoughnessoftheweldedjointswasalsorelativelylow.Thehardnesstestresultsshowedthatthehardnessoftheweldedjointswashigh.4.ConclusionThroughthestudyofthemicrostructureandmechanicalpropertiesofN06625GTAWweldedjoints,thefollowingconclusionscanbedrawn:thereisgraingrowthintheheat-affectedzoneoftheweldedjointswithobviouslatticedistortion;thetensilestrengthandimpacttoughnessoftheweldedjointsarerelativelylow,andthehardnessishigh.Theseresearchresultscanprovidereferenceforoptimizingtheweldingprocessofweldedjoints.References:[1]ZhangS,LiW.MicrostructureandmechanicalpropertiesofgastungstenarcweldedInconel625alloyjoints[J].JournalofMaterialsScience,2017,52(15):8998-9011.[2]WangL,ZhaoX.EffectsofweldingheatinputonmicrostructureandmechanicalpropertiesofInconel625jointsbyautogeneouselectronbeamwelding[J].JournalofMaterialsScience&Technology,2020,49:1-9.Furtherreading:[1]ReinhardM,SartoriS.Microstructureandpropertiesofhigh-temperaturephaseNi