高铬铸铁耐磨堆焊埋弧药芯焊丝研究

433111121.450052;2.300400Cr/CCr/CCrCr/C,41#43#45#Q235β41=27.1716β43=18.6305β45=19.7949TG422.3A1007−9289(2007)04−0033−05TheResearchofHardfacingSubmergedFlux-coredWireswithHighCrCastIronYANGWei1WANGXin1ZHANGYong-sheng1LIJun-wei1LIBen-shen2(1.ZhengZhouResearchInstitudeofMechnicalEngineering,ZhengZhou,450052;2.Tianjinzhen-xingCementLimitedCompary,Tianjin300400)Abstract:ThemicrostructureandwearresistanceofahighCrcastironwereinvestigatedusingflux-coredwireforautomaticsubmergedhardfacingarcweldingtechniquewiththeaimtoexaminetheeffectofCr/C.TheresultsshowedthatwiththeincreaseofCr/C,theshapeofprimarycarbidebecamemoreandmoreregular,thebacilliformfibre’slengthoftheprimarycarbidebecameincreased,whichisbeneficialtothetoughnessofhardfacinglayer.TheincreaseofCrcontentinthemicrozoneofprimarycarbideenhanceditsmicro-hardness.Cr/Candtheareafractionofprimarycarbidehadevidenteffectonthewear-resistance.Thefractionofprimarycarbideandwear-resistanceshowedalinearrelationship.Thewear-resistanceofhighCrcastironhardfacinglayerwasaffectedobviouslybythemicrostructureofthematrix,Thehardfacinglayersbyusing41#,43#and45#weldingwires,i.e.formedbytheausteniteanditsdissolvedproductshowedthebestwear-resistance.Theirrelativewear-resistancetotheQ235steelwereβ41=27.1716β43=18.6305andβ45=19.7949respectively.Theeffectofcavitiesandcrackpropagationinwearprocessofhardfacinglayerwasapproachedaswell.Keywords:hardfacing;flux-coredsolderwires;submergedarcwelding;wearresistance;highCrcastiron.0,2007–04–032007–04–121982–[1]:[2](Cr,Fe)7C3,HV1300~1800[3]204Vol.20No.420078CHINASURFACEENGINEERINGAugrst.2007342007Q235Q235β11.1C5.5%Cr,Cr/C11/%Table1Thedesignedcompositionofflux-coredwiresw/%41#43#45#C5.505.505.50Cr20.0030.0040.001.24mmMZD100010710mm22Table2WeldingparameterofsubmergedarcweldingU/VI/Aν/mm/min303645055060010001.3JXA-8800R1.4ARLHR150A(HRC)1373N101.5××70mm×25mm×10mm22.1333,%Table3Thechemicalcomposition%andperformanceofhardfacinglayerCCrCr/CHRC/%41#5.3720.483.8263.8330.8143#5.6832.025.6364.7745.2745#5.6840.127.0764.5043.192.210001.2544(,%)Table4TheanalysisresultsofmicrozoneoftheprimarycarbideCCrFeC/(Cr+Fe)41#29.4631.7838.7629.46/70.5443#29.5839.9830.4429.58/70.4245#31.0347.1721.8031.03/68.974M7C3(Cr,Fe)7C31500XCr/C(Cr,Fe)7C3(Cr,Fe)7C3435Cr/C(Cr,Fe)7C3Cr(Cr,Fe)7C3.[4](a)41500(b)43500(c)455001500Fig.1ThemicrostrctureofhighCrcastironhardfacinglayer500(a)41#4000(b)43#4000(c)45#5000X2Fig.2Theeutecticcarbideandmatrixinmicrostructureofhardfacingalloysunderhighmagnification2241#41#5243#45#5M7C3(Cr,Fe)7C32,2.36Cr/C(%)362007345(x/%)Table5TheEDSanalasysofeutecticmicrostructure(x/%)6SiO2)(g,,)Table6TheresultsofdampSiO2rubberwheelweartestsabcβ41111.2050111.16770.0373027.1716=β4143110.3819110.32750.0544018.6305=β4345108.3917108.34050.0512019.7949=β45Q235110.7748109.7613d=1.01351.0000=βQ2353Fig.3TheeffectofCr/ConwearresistanceCr/Cβ33βCr/CCr/CCr/Cβ20%40%βCr/C4Fig.4TheeffectofPrimarycarbidefractiononwearresistance4β4Cr/C3441#41#[5]414000SEM541434000SEM455000X,4345415.5%20%~40%(Cr,Fe)7C3C/(Cr+Fe)C30.0029.5841#Si02.10Cr22.266.23Fe47.7462.0930.00/70.00=3:7C28.1543#Si03.2Cr24.669.58Fe47.1987.2228.15/71.85≈3:7C30.2645#Si0.453.6Cr35.4815.20Fe33.8181.2030.26/69.29≈3:7Cr/Cββ437(Cr,Fe)7C3(Cr,Fe)7C313β41#43#45#Q23527.171618.630519.7949[6](Cr,Fe)7C3HRC633Cr/C(1)3Q235β41=27.1716β43=18.6305β45=19.7949(2)Cr/C(Cr,Fe)7C3Cr/C(Cr,Fe)7C3Cr(Cr,Fe)7C3(3)5.5%20%~40%Cr/CCr/CβCr/C20%41#43#45#41#(4)(Cr,Fe)7C3[1].[M].:1986.[2],.Fe-Cr-CJ.,2004,25(1):103-106.[3].[M].:,1990.[4].[M]..1999.[5]DoganON,AlmanDE,HawkJA.P/MFe/Cr-TiCComposites,Processing,microstructureandabrasivewearbehavior[J].AdvacesinPowderMetallurgyandParticulateMaterials2001,25147:2057-2073.[6].[M]..1993.8150052Tel:[phone]:[e-mail]