40Cr鋼固體滲硼研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文40Cr鋼固體滲硼研究姓名：李文健申請學(xué)位級別：碩士專業(yè)：材料工程指導(dǎo)教師：樊新民；易人泉201203Abstract碩士論文AbstractInthispaper，alowcostofboronizingmixtIlrewasmadebyorthogonaltests，theoptimumpackqualitythattheboronizingmixtIlrepackedaroundthecomponentwa

2、sestimated，kineticstudiesonborided40CrsteelwerereportedThemorphologyandtypesofboridesformedonthesurfaceofsteelsubstrateswereconfirmedbyopticalmicroscopyandXraydiffraction(XRD)analysisThehardnessandfracturetoughnessofbori

3、dedsurfacesweremeasuredviaVickersindentersTheboronizingmixturewhichwasdeterminedbyorthogonaltestscontains15％boraxasdonor，28％activator，20％reductant，37％diluent40Crsampleshavebeenboronized謝tllvaryingpackqualityintherange073

4、—2199／cmzat910“Cfor5handtheresultingboridecoatingshavebeenexaminedforthickness，microstructure，microhardnessprofileandfracturetoughnessAnanalysisoftheresultsobtaine。dindicatedthatapackqualityof146罾耐issufficienttoobtainbor

5、idecoatingsofadequatethicknessandoptimumproperties40CrSteelwasboridedat850℃，880℃，890℃for3，5，7and9hTheresultsshowedthatthegrowthrateconstant(K)of40Crat850。C，880“C，890“0were23826x10‘13m力s，44225x10。13m2／s，146885x10‘12m2／sre

6、spectivelyActivationenergies(Q)ofborided40Crsteelwasdeterminedas238kJ／m01MoreoveranattemptWasmadetoinvestigatethepossibilityofpredictingthecontourdiagramsofboridelayersvariationandtoestablishsomeempiricalrelationshipsbet