GH4169合金惯性摩擦焊接过程动态再结晶行为的数值模拟的开题报告摘要：GH4169合金是一种重要的高强高温合金，广泛应用于航空、航天及石油化工等高端领域。在高温过程中，GH4169合金往往会发生变形，进而对其性能产生影响。为了研究GH4169合金的变形行为，本文采用数值模拟的方法对GH4169合金惯性摩擦焊接过程动态再结晶行为进行探究。首先，针对GH4169合金的化学成分、微观结构以及力学性能进行了简要介绍，探讨了GH4169合金的热变形机理。然后，通过有限元模拟方法对GH4169合金惯性摩擦焊接过程进行了模拟，分析了焊接过程中变形量、温度分布等参数的变化。最后，采用经验公式模拟GH4169合金动态再结晶行为，研究其晶粒尺寸和形貌的变化。研究结果表明，GH4169合金在焊接过程中会受到很大的热变形影响，局部温度会出现显著的升高，在高温下容易发生再结晶。动态再结晶过程中，晶粒尺寸呈现出先增大后减小的趋势，形貌也发生了明显的变化。本文的研究结果对研究GH4169合金的动态再结晶行为提供了一定的参考价值。关键词：GH4169合金；惯性摩擦焊接；动态再结晶；数值模拟Abstract:GH4169alloyisanimportanthigh-strengthandhigh-temperaturealloy,widelyusedinhigh-endfieldssuchasaerospaceandpetroleumchemistry.Duringhigh-temperatureprocesses,GH4169alloyoftenundergoesdeformation,whichaffectsitsperformance.InordertostudythedeformationbehaviorofGH4169alloy,thispaperusesnumericalsimulationmethodtoexplorethedynamicrecrystallizationbehaviorofGH4169alloyintheinertiafrictionweldingprocess.Firstly,thechemicalcomposition,microstructure,andmechanicalpropertiesofGH4169alloyarebrieflyintroduced,andthehotdeformationmechanismofGH4169alloyisdiscussed.Then,thefiniteelementsimulationmethodisusedtosimulatetheinertiafrictionweldingprocessofGH4169alloy,andthechangesofdeformationamount,temperaturedistributionandotherparametersduringtheweldingprocessareanalyzed.Finally,thedynamicrecrystallizationbehaviorofGH4169alloyissimulatedusinganempiricalformula,andthechangesofgrainsizeandmorphologyarestudied.TheresearchresultsshowthatGH4169alloyisgreatlyaffectedbythermaldeformationduringtheweldingprocess,andthelocaltemperaturewillsignificantlyincrease,whichispronetorecrystallizationathightemperatures.Duringdynamicrecrystallization,thegrainsizepresentsatrendofincreasingfirstandthendecreasing,andthemorphologyalsoundergoessignificantchanges.TheresultsofthisstudyprovideareferenceforresearchingthedynamicrecrystallizationbehaviorofGH4169alloy.Keywords:GH4169alloy;inertiafrictionwelding;dynamicrecrystallization;numericalsimulation