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时间:2019-11-26
《固溶处理GH4169合金的高温变形行为》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第31卷第2期航空学报V01.31No.2201O年2月ACTAAERONAUTICAETASTRONAUTICASINICAFeb.2010文章编号:1000—6893(2010)02—0368—09固溶处理GH4169合金的古:日爿k同皿又形行为李晨,李淼泉,王柯(西北工业大学材料科学与工程学院,陕西西安710072)DeformationBehaviorofNickelBasedSuperalloyGH4169ThroughSolutionTreatmentLiChen,LiMiaoquan,WangK
2、e(SchoolofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi’an710072,China)摘要:对GH4169合金进行了固溶温度为1233,I253,1273,1293K,保温时间为30~60min的固溶处理试验,得到了GH4169合金中8相形貌由针状向短棒状和颗粒状转变,数量逐渐减少直至消失的演变规律。将固溶处理后的GH4169合金通过热模拟压缩实验,研究变形工艺参数和固溶处理对GH4169合金高温变形行为的
3、影响。热模拟压缩实验时选取的变形温度为1123~1288K,应变速率为0.1~10.0S~,变形程度为60%。结果表明:流动应力随变形温度的降低和应变速率的提高而迅速增大,8相不仅使流动应力降低,而且对动态再结晶过程产生强烈的促进作用;利用多元回归分析方法建立的流动应力模型的计算值与实验值的误差小于lo%,较好地描述了固溶处理GH4169合金在高温变形过程中的塑性流动行为。关键词:高温合金;热处理;相转变;塑性变形;模型中图分类号:V252;TGl32.4文献标识码:AAbstract:Themicrostr
4、uctureobservationresultsofsuperalloyGH4169showthatduringthehold—ingtimeat1233,1253,1273and1293Kfor30uptO60minutesthemorphologyofthe8phasechangesfromlongneedleshapetOshortbarsandparticles,accompaniesbyacorrespondingthedecreaseof8phasecontentuntilitdisappears
5、.TheeffectoftheprocessingparametersandsolutiontreatmentonthedeformationbehaviorofsuperalloyGH4169isinvestigatedusingcompressiontests.ExperimentsarecarriedOUtinaTher—meemaster_Zsimulatoratdeformationtemperaturesof1123-1288K,andstrainratesof0.1-10.0s~.Theresu
6、ltsshowsthattheflowstressincreasesdrasticallywiththedecreaseofdeformationtemperatureandthein.creaseofstrainrate.Theexistenceofthe8phasenotonlydecreasestheflowstress。butalsoeffectivelypro—motesthedynamicrecrystallizationprocess.Theflowstressmodelofsuperalloy
7、GH4169duringhightempera-turedeformationisestablishedbyusingtheregressionmethod.Theaveragerelativedifferencebetweenthecalculatedandtheexperimentalflowstressislessthan10%.Itcanbeconcludedthattheflowstressmodelcanefficientlyeffectivelypredictthedeformationbeha
8、viorofsuperalloyGH4169duringhightemperaturedeforma-tion.Keywords:superalloys;heattreatmentphasetransition;plasticdeformation;modelGH4169合金是镍一铬一铁基高温合金,它以7相为基体,通过沉淀析出y’(Ni。Nb)和7‘[Ni。(AI,Ti)]相达到弥散强化,使其具备足
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