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1、第37卷第1期中国激光Vol.37,No.12010年1月CHINESEJOURNALOFLASERSJanuary,2010文章编号:025827025(2010)012025020635CrMoA钢激光淬火2渗氮复合处理微观组织与性能程义远王勇韩彬李美艳(中国石油大学机电工程学院,山东东营257061)摘要对35CrMoA钢进行激光淬火2渗氮复合处理,采用光学显微镜(OM)、X射线衍射仪(XRD)、透射电镜(TEM)、显微硬度计及磨擦磨损试验研究了激光淬火/渗氮层的显微组织、硬度及耐磨性能,并与气
2、体渗氮层对比。结果表明,两种渗氮层均由ε相,γ′相,Cr2N相及Fe3C组成。激光淬火/渗氮白亮层中ε2Fe3N含量较高,而脆硬的ζ2Fe2N相及Fe2O3含量较低,且Cr2N颗粒细小。扩散层中γ′2Fe4N中存在超点阵结构,Fe原子和N原子在γ′相中有序排列,γ′相和α2Fe相存在一定的位向关系,二者的共格性和相容性优良,细小渗碳体分布在条状下贝氏体组织中。激光淬火/渗氮试样的磨损表面划痕较浅,而气体渗氮试样表面有较深的犁沟,局部区域存在剥落,激光淬火/渗氮复合处理使渗氮层深度增加,硬度提高,耐磨性
3、增强。关键词激光技术;渗氮;微观组织;显微硬度;耐磨性中图分类号TG665文献标识码Adoi:10.3788/CJL20103701.0250MicrostructureandPropertiesof35CrMoASteelinLaserQuenching2NitridingChengYiyuanWangYongHanBinLiMeiyan(CollegeofMechanicalandElectronicEngineering,ChinaUniversityofPetroleum,Dongying,S
4、handong257061,China)AbstractLaserquenchingandnitridingtreatmentareperformedon35CrMoAsteel,andthemicrostructure,hardnessandwearresistanceoflaserquenching/nitridedlayerwereinvestigatedbymeansofopticalmicroscope(OM),X2raydiffractomer(XRD),transmissionelect
5、ronmicroscope(TEM),microhardnesstesterandwearequipmentcomparedwiththegasnitridedlayers.Theresultsshowthat,bothnitridedlayerconsistofε,γ′,Cr2NandFe3C.Thecontentofε2Fe3Nishigherinthelaserquenching/nitridedwhitelayerwhilethecontentsofthebrittleζ2Fe2NandFe2
6、O3arelowerthanthatofthegasnitridedlayer,andtheCr2Nparticlesaremuchfiner.Theultralatticestructureexistinγ′2Fe4Ninthediffusionlayer,inwhichtheFeandNatomarrangeorderly.Therearephaserelation,coherenceandcompatibilitybetweenγ′2Fe4Nandα2Fe.Sphericalparticleso
7、fcementiteareformedinlowerstripbainite.Thescratchinwornsurfaceoflaserquenching/nitridedlayerisshallow,butthegasnitridingwornsurfacehasdeepplowfurrowandflaking.Afterlaserquenching/nitridingtreatment,thedepthofthenitridedlayerincreases,andhardnessaswellas
8、wearresistanceareimproveddramatically.Keywordslasertechnique;nitriding;microstructure;micro2hardness;wearresistance1引言幅度上升,含沙量增加,产出液腐蚀性增强等原因,目前常用的抽油泵材质主要为45#钢,导致抽油泵严重腐蚀、磨损。为了提高抽油泵内表35CrMo,38CrMoAl等中碳钢,由于油田含水量大壁的耐磨性和耐蚀性,工程应用中常进行渗氮
