AISI304不锈钢在冷加工过程中的微观组织变化

2962002JOURNALOFBEIJINGUNIVERSITYOFCHEMICALTECHNOLOGYVol.29,No.62002AISI304111,2(1.,100029;2.,438000):AISI304,,;AISI304(,-70),,:,;,AISI304,:AISI304;;;:TG142.71:2002203211:(G19990650);(99A084);:,1942,,65%70%[1],20,,,,,[2],;,321304,,20,,[3,4],,,,,(bcc),,,,,,,,,,,[5],(304),,AISI304,,AISI304,AISI3041111AISI304(,%):C0106,Si0155,Mn019,S01017,P01028,Cr18146,Ni8106,Fe,(105010)30min,112220mm25mm3mm,INSTRON11852mm/min;110mm12mm3mm,;TSJ1A10mm10mm016mm300#400#600#800#1000#80m;TWIN-JET:90%10%,:30V,50mA;H-810(TEM)AISI304AISI304,21Fig.1Relationbetweenstrainandmartensitephasecontent2111231AISI304,(,-70)(+25),AISI304,(+180),AISI30423mmAISI304,r,,,AISI304,,,,3,,AISI304,AISI304,2Fig.2Relationbetweenbendradiusandmartensitephasecontent3Fig.3RelationbetweenrollingdeformationdegreeandmartensitecontentAISI304Ms()WNi(%)[6],:Ms=4117[1416-w(Cr)]+516[819-w(Ni)]+3313[1133-w(Mn)]+2718[0147-w(Si)]+166617[01068-w(C)-w(N)]-1718(1)WNi=w(Ni)+0165w(Cr)+0198w(Mo)+1105w(Mn)+0135w(Si)+1216w(C)+0103(T-822002300)-213lg[100/(100-R)]-219(2):T,K;R,%;w,%Ms,,TMs,(1)AISI304Ms-14816,-14816,AISI304,,[7],AISI304,2515%2610%,AISI304,,2015%2515%,,,(2)AISI304,1910%,,,AISI304212TEM,(TEM)AISI304,0AISI3044,AISI304,,,,5AISI304-7020%,AISI304,1015%,,,213,6AISI304,,,,,(c),4304(TEM)Fig.4Microstructureanddiffractionofundeformed304SS(TEM)5-7020%304(TEM)Fig.5Microstructureanddiffractionof304SSwhichstretchedat-70with20%degreeofdeformation(TEM),[6],,,,,(b)AISI304-7020%,,AISI3040106%,013%,214AISI3047AISI304180,,AISI304(a)926:AISI304,,,20%,(f),,,,,,,[8],,,106,10111012[9],,,,,,6304(200)Fig.6Effectofstrainonparticlesof304SS7180304(6000)Fig.7Effectofstrainonthedislocationdensityof304SSat1800320023(1),AISI304,(2)AISI304,,(3)AISI304[1],.[M].:,1991[2].[M].:,1985[3],,,.[J].,1998,25(2):57-63[4]CigadaA,MazzaB,PedeferriP,etal.Stresscorrosioncrackingofcold2workingausteniticstainlesssteels[J].CorrosionScience,1982,22(6):558-578[5],,,.[M].:,2000[6].AISI321[D].[].:,1996[7]M.[J].,1984,4:28-34[8].[M].:,1994[9].[M].:,1984MicrostructurechangeofAISI304stainlesssteelinthecourseofcoldworkingXUChun2chun1ZHANGXin2sheng1HUGang1,2(1.CollegeofMaterialsScienceandEngineering,BeijingUniversityofChemicalTechnology,Beijing100029,China;(2.DepartmentofChemistry,HuanggangNormalUniversity,HubeiHuanggang438000,China)Abstract:MartensitecontentofAISI304stainlesssteelscold-workedatdifferenttemperatures,waysandde2greesofdeformationwasexaminedbyferrmagnetometer,whichwasusedtostudytherelationsbetweencoldworkingandmartensitephasetransformation.ThedistributionofthedislocationsofAISI304stainlesssteelsdrawnat-70withdifferentdegreesofdeformationwasobservedbytransmissionelectronmicroscope(TEM),whichwasusedtostudytherelationsbetweencoldworkinganddislocationdensity.Theresultsshowthatcoldworking,tosomeextent,cancausedeformation-inducedmartensite,whosecontentincreaseswiththeincreaseofdeformation.Atthesametime,itisalsofoundthatcoldworkingmakestheparticlesofAISI304stainlesssteelsstretchedandthedislocationdensityofAISI304stainlesssteelincreaseswiththeincreaseofde2formation.Keywords:AISI304stainlesssteel;coldworking;martensitephasetransformation;dislocationdensity()136:AISI304