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时间:2020-04-30
《交变磁场对激光熔覆Fe基复合涂层组织结构及其耐磨性的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第3期摩擦学学报Vol33No32013年5月TribologyMay,2013交变磁场对激光熔覆Fe基复合涂层组织结构及其耐磨性的影响蔡川雄,刘洪喜,蒋业华,王传琦,张晓伟,唐淑君(昆明理工大学材料科学与工程学院,云南昆明650093)摘要:采用激光熔覆辅助电磁控制工艺在45钢表面合成了Fe—Cr—si—B—C复合涂层.通过对熔覆层进行SEM、EDS和XRD表征,研究了外加交变磁场对涂层微观组织和物相结构的影响.结果表明:外加磁场可降低激光熔池固一液界面前沿液相的温度梯度和增加非均质形核率,促使粗大、
2、方向性很强的柱状晶转变为均匀、细小的等轴晶,并能够消除熔覆层内的气孔和裂纹等缺陷,但其对熔覆层物相组成的影响不大.熔覆涂层由白色初生一(Fe,Cr)固溶体相和其间黑色的一(Fe,cr)共晶相组成,同时含有少量Fe,(B,C)、Cr7(B,C)、CrFeB等碳化物和硼化物.常温干摩擦磨损试验表明,外加磁场所制备的涂层耐磨性能得到明显提高,其磨损失重仅为未加磁场的43%,且摩擦系数波动较小.关键词:激光熔覆;交变磁场;复合涂层;微观组织;摩擦磨损中图分类号:TN249;TG156.5文献标志码:A文章编号:1004
3、—0595(2013)03—0229—07InfluenceofACMagneticFieldonMicrostructureandWearBehaviorsofLaserCladdingFe·—-BasedCompositeCoatingCAIChuan—xiong,LIUHong—xi,JIANGYe—hua,WANGChuan—qi,ZHANGXiao—wei,TANGShu—jUB(FacultyofMaterialsScienceandEngineering,KunmingUniversityofSc
4、ienceandTechnology,Kunming650093,China)Abstract:Fe—Cr—Si—B—Ccompositecoatingswerefabricatedon45mediumcarbonsteelsubstrateusingelectromagneticcontrolassistedlasercladdingprocess.Themicrostructure,phasecomposition,frictionandwearbehaviorsofthecompositecoatings
5、wereinvestigatedbyX—raydiffraction,scanningelectronmicroscopy,energydispersespectroscopy,andapin—on—disctribometer.TheresultsindicatethatACmagneticfieldcanreducetheliquidphasetemperaturegradientoflasermoltenpoolsolid—liquidinterfaceandincreasetheheterogeneou
6、snucleationrate.Consequently,coarsecolumnargrainsintouniformandfineequiaxedgrainswaspromptedandtheporesandcracksdefectsinthecompositecoatingswereeliminated.However.ithadnodistincteffectonthephasecompositionofthecompositecoatings.Thecoatingsweremainlycomposed
7、of一(Fe,Cr)solidsolution,一(Fe,Cr)eutecticandasmallamountofFe3(B,C),Cr7(B,C)3andCrFeBcompounds.ThefrictionandwearbehaviorsofthecompositecoatingstreatedbyACmagneticfieldweremuchbetterthanthatofuntreatedcoatings.Thewearoftheelectromagneticcontrolassistedlasercla
8、ddingcoatingswas50%ofthatofthenon—magneticfieldcoatings,andthefluctuationoffrictioncoeficientwaslow.Keywords:lasercladding,ACmagneticfield,compositecoatingmicrostructure,frictionandwear,Received
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