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1、第37卷第1期中國激光Vol.37,No.12010年1月CHINESEJOURNALOFLASERSJanuary,2010文章編號:025827025(2010)012025020635CrMoA鋼激光淬火2滲氮復合處理微觀組織與性能程義遠王勇韓彬李美艷(中國石油大學機電工程學院,山東東營257061)摘要對35CrMoA鋼進行激光淬火2滲氮復合處理,采用光學顯微鏡(OM)、X射線衍射儀(XRD)、透射電鏡(TEM)、顯微硬度計及磨擦磨損試驗研究了激光淬火/滲氮層的顯微組織、硬度及耐磨性能,并與氣
2、體滲氮層對比。結(jié)果表明,兩種滲氮層均由ε相,γ′相,Cr2N相及Fe3C組成。激光淬火/滲氮白亮層中ε2Fe3N含量較高,而脆硬的ζ2Fe2N相及Fe2O3含量較低,且Cr2N顆粒細小。擴散層中γ′2Fe4N中存在超點陣結(jié)構(gòu),Fe原子和N原子在γ′相中有序排列,γ′相和α2Fe相存在一定的位向關(guān)系,二者的共格性和相容性優(yōu)良,細小滲碳體分布在條狀下貝氏體組織中。激光淬火/滲氮試樣的磨損表面劃痕較淺,而氣體滲氮試樣表面有較深的犁溝,局部區(qū)域存在剝落,激光淬火/滲氮復合處理使?jié)B氮層深度增加,硬度提高,耐磨性
3、增強。關(guān)鍵詞激光技術(shù);滲氮;微觀組織;顯微硬度;耐磨性中圖分類號TG665文獻標識碼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,產(chǎn)出液腐蝕性增強等原因,目前常用的抽油泵材質(zhì)主要為45#鋼,導致抽油泵嚴重腐蝕、磨損。為了提高抽油泵內(nèi)表35CrMo,38CrMoAl等中碳鋼,由于油田含水量大壁的耐磨性和耐蝕性,工程應(yīng)用中常進行滲氮
