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时间:2019-02-24
《高铬铸铁耐磨堆焊埋弧药芯焊丝研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、万方数据第20卷第4期中国表面工程V01.20No.42007年8月CHINAsuRFAcEENGINEERINGAugrst.2007高铬铸铁耐磨堆焊埋弧药芯焊丝研究杨威1,王欣1,张永生1,李军伟1,李本深2(1.郑州机械研究所,郑州450052;2.天津振兴水泥有限公司,天津300400)摘要:采用自动埋弧堆焊对高铬铸铁埋弧药芯焊丝堆焊合金的组织及耐磨性进行试验,研究Cr/C对堆焊层的组织和耐磨性的影响。研究发现,Cr/C增加,初生碳化物形状越来越规则,初生碳化物的杆状纤维增长,增加堆焊层的韧性。初生碳化物微区Cr含量增加,
2、增加初生碳化物显微硬度。Cr/C与初生碳化物面积分数对耐磨性的影响比较明显,其中初生碳化物面积分数与耐磨性呈线性关系。高铬铸铁堆焊层的耐磨性受到基体组织影响较大,由奥氏体及其分解产物构成的混合基体的堆焊层耐磨性最大。文中所研究的41#、43#、45#焊丝其堆焊层的耐磨性非常好,相对Q235钢的耐磨性分别为段1=27.1716、B43=18.6305和∥45=19.7949。文中进一步探讨了耐磨堆焊层磨损过程中的孔洞效应及裂纹扩张效应。关键词:耐磨堆焊;药芯焊丝;埋弧焊;耐磨性;高铬铸铁中图分类号:TG422.3文献标识码:A文章编
3、号:1007—9289(2007)04-0033—05TheResearchofHardfacingSubmergedFlux-coredWireswithHighCrCastIronYANGWeil,WANGXinl,ZHANGYong—shen91,LIJun—weil,LIBen.shen2(1.ZhengZhouResearchInstitudeofMechnicalEngineering,ZhengZhou,450052;2.Tianjinzhen—xingCementLimitedCompary,Tianjin3004
4、00)Abstract:ThemicrostructureandwearresistanceofahighCrcastironwereinvestigatedusingflux—coredwireforautomaticsubmergedhardfacingarcweldingtechniquewiththeaimtoexaminetheeffectofCr/C.TheresultsshowedthatwiththeincreaseofCr/C,theshapeofprimarycarbidebecamemoreandmorere
5、gular,thebacilliformfibre’Slengthoftheprimarycarbidebecameincreased,whichisbeneficialtothetoughnessofhardfacinglayer.TheincreaseofCrcontentinthemicrozoneofprimarycarbideenhanceditsmicro—hardness.Cr/Candtheareafractionofprimarycarbidehadevidenteffectonthewear-resistanc
6、e.Thefractionofprimarycarbideandwear-resistanceshowedalinearrelationship.Thewear-resistanceofhighCrcastironhardfacinglayerwasaffectedobviouslybythemicrostructureofthematrix,Thehardfacinglayersbyusing41#,43#and45#weldingwires,i.e.formedbytheausteniteanditsdissolvedprod
7、uctshowedthebestwear-resistance.Theirrelativewear-resistancetotheQ235steelwere以1=27.1716、f143=18.6305andf145=19.7949respectively.Theeffectofcavitiesandcrackpropagmioninwearprocessofhardfacinglayerwasapproachedaswell.Keywords:hardfacing;flux—coredsolderwires;submergeda
8、rCwelding;wearresistance;highCrcastiron.0引言近二十年来,国内外已经逐渐广泛将高铬铸铁用于矿山、机械、电力、及冶金等行业的备件上,如破碎机滚筒、衬板、锤头、磨煤机辊套、磨球、料斗、立磨磨辊及磨盘等均取得相当成
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