热处理对镍钛合金丝材弯曲疲劳性能的影响

5　1　19973　　　　　　MATERIALSCIENCE&TECHNOLOGYVol.5　No.1Mar.　1997杨　恒　刘礼华　曹文涛　王兰英()　　50.6at%Ni-Ti。:,1023k673k,;;;;。　;;;:1996-09-04:,203　　、。。[1-9],[4-8]。。。1　试验方法1.1　99.9%99.87%。1173k,H8.5mm,873kH1.2mm。50.6at%Ni-Ti。973k、1023k、1073k、1123k1173k5,673k60。1HF+8HNO3+16H2O。,,1023k×30mm,813k×120min,1.2mm。1.2　,XL-250GX-3A,。1.3　,,GW-532,,。1。R,。εmax=d2R×100%:d。1　1.　2.　3.Fig.1　Schematicofbendingexperiment2　结果2.1　,,22　a—　b—Fig.2　Bending-fatiguelifeofsamplesunderdiffer-entsurface　　,,。,。2.2　,εmax=8.6%εmax=4.6%,3。3　a—εmax=8.6%　　　b-εmax=4.6%Fig.3　Bending-fatiguelifeofsamplesunderdifferentstrain　　(7%),[6,7,11]。≤1073k,103。2.3　,4。4,,。2.4　4ab,。1023k。4　a—　　b—Fig.4　Bending-fatiguelifeofsamplesunderdifferentheat-treatmen　　、5。5　、a—b—Fig.5　Relatiensofbending-fatiguelife,tensilestrengthandheatingtemperature　　,。,6。。·96·　　　　　　　　　　　　　　　　　　　　　　56　、a-b-Fig.6　Relationsofbending-fatiguelife,torsiontimeandheatingtemperature　　,。7。7　、a—b—Fig.7　Relationsoftensilestrength、bending-fatiguelifeandcompressibilityofdrawing　　。,,,。3　讨论DSC,1。,εmax8。8.6%,。1　Table1　TransformationpointofpartialsamplesAs(K)Ms(K)　261.6185.11023k×5′272.2247.21023k×5′R321.8268R307.3k673k×60′R318.4k1173k×5′272.6248.18　a-b-、c-、d-Fig.8　Bending-fatiguelifeofsamplesunderdifferantstate　　r=2.5mmφ1.2mmShuichMIYAZAKIKazuhiroOTSU-KA50.8at%Ni-Ti[10],。MsRTR,(Ms)。,,AsMs。,,;,,,。673k×60min,R,TR=307.3K。,Ti3Ni4;·97·1　:　。,Ms。(293k)TR,Ms(268k),,。,,,。1023k,,,。。4　结论(1)50.6at%Ni-Ti,。(2)。(3),。(4)。　　　1　JPerkins,ShapeMemoryEffersinAlloys(1975),PLenumPressNewYork,5172　TanJinbiaoet,Proc.Int.Sym.OnShapeMemoryAlloys(SMA86),Guilin,China(1986),4653　T.Honmaetc.Proc.Int.Sym.OnShapeMemoryAlloys(SMA-86)Guilin,China(1986),4754　TheFirstInternationalConferenceonShapeMemorvandSu-perlasticTechnologies(SMST-94).California5　ShapeMemoryMaterials94ProceedingsoftheInnternationalSymposiumonShapeMemoryMaterialsBeijinChina6　,,《》,9297　,《》,,9358　19889　9010　ShuichiMIYAZAKIandKazuhirsOTSUKADevelomentofShapeMemoryAllorysISUInternational,Vol.29(1989)No.5P.353-33711　、,NiTi《》1995P.531-532TheEffectoftheHeatTreatmentontheBending-FatiguePropertyofNiTiAlloyWireYangHeng,LiuLihua　CaoWentao,WangLanyin(JiangSuSteelWireRopeBlockCO.JiangYinResearchInstituteofMetalProducts)AbstractTheeffectofheattreatmentonbending-fatiguepropertyofthe50.6at%Ni-Tialloywirehasbeenstudiedinthispaper.Theresultsshowthatthewirehasdifferentbending-fatiguelifeaftersolu-tiontreatmentandaging;thewirethatsolutiontreatedat1023kandagedat673khasthelongestlife;thetensilestrengthhasthesametrendasbending-fatiguelife,deformationandagingarehelpfultoin-creasethebending-tatigueproperty;theoxidationsurfacedecreasethebending-fatiguepropertyobvi-ously,whichhavebeendiscussedpreliminarily.KeyWords:NiTiWire;HeatTreatment;Bending-fatigue·98·　　　　　　　　　　　　　　　　　　　　　　5