奥氏体γ系不锈钢的塑性加工特性研究

20051()3,,(,550003):,,,,,,,,,:;;;:TG317:A:100023940(2005)0120064203Plasticworkingcharacteristicsstudyofaustenite()stainlesssteelZHENGWei2gang,LUOYan2ke,YINHua(CollegeofMechanicalEngineeringandAutomation,GuizhouUniversity,GuiyangGuizhou550003,China)Abstract:Basedontheexperimentalresultsthattheaustenitestainlesssteelhasthecharacteristicsoflowyieldpoint,notranslationpointandphasetransformationthroughthefabrication,etc1itisfurtherclarifiedtheplasticde2formationprinciple,thereasonforfatiguecracksthroughthestudyandanalysisoftheplasticprocessingfeaturesofaustenitestainlesssteelhardening,phasetransformationmartensiteandfatiguecracks1Thereasonablesettlingmeas2ureshavebeenputforwardwhichprovidethereliableprocessdesignbasisforcorrectlyusingthesematerialsmakingmetalproducts1Keywords:austenitestainlesssteel;hardeningcharacter;martensitictransformation;delayedcrack3,48,:20042022121,,,,,,(s/b),,,,,,,2,n,n,11828n[1]1Table1Oftenusedhardeningindexesofplasticworkingmaterial()18-8n0.290.250.360.51,sb:(s/b),40%50%,,18281[2]1,,,,,,,46©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3]:W=0+0(1)0000;,,,,(1),,CNNiCu,,,217Cr27Ni[4],;,,,3[5],,A,,(),,2(17Cr-7Ni)Fig12Changeofmartensitegeneratingcapacityatdifferenttemperaturesandtensiledeformation(17Cr-7Nistainlesssteel)3,18Cr2615Ni22Cu,k22115Fig13ConditionsofMartensitictransformationatcylindertensileforming,18Cr2615Ni22Custeel,tensileratiok221154,,,,,(),(),,,,4X[6]10mm,CH2,,,5(Ni),56©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(18Cr28Ni,k2312)Fig14Changeofresidualstressforcylindricacupflank(18Cr28Nisteel,tensileratiok23121)[6]deflection,5mm,85,,,,,,,,540mma()Fig15Therelationshipbetweena,transfonrmationcapacityandmax1residualstress(circumference)in40mmcylindertensileforming5(1),,(),,(2),,(),,,(3),,,:,NiCu,,,,,;,R;,,:[1]nF[·Ì™]1993,9()1[2]™¦Ó̙[J]1,1996340(5)()1[3]Patel,JRCohen,M:ActaMetalluyg,1953,1(5):5311[4]11:™¦Ó̙[J]1,1977,18(11):2021[5]111Šy™¦ª„¨™¦Ó̙[J]1,1976,17(190):8911[6]11™¦Ó̙·Ì™[J]1,1978,2,19(205):15021511,20051091314,,,:1)(:690;:180)(2005.8.1),2005109-13,:25000:2):29000:3)::2000,:18:100083:010-6292065482415084:010-62920654E2mail:duanya@cmes1orgduanya2005@1261com:66©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.