放电加工表面合金化课件

放電加工表面合金化報告人：李健誌指導老師：戴子堯2007/06/051放電加工表面合金化報告人：李健誌1大綱前言實驗方法與結果結論2大綱前言2前言再鑄層熔融組織、痘瘡與淺坑、球狀附著物、窩孔、積碳、氣孔與裂紋。目前文獻方法能減少上述問題，但非全面性。實驗目的線放電加工Ti合金其表面合金化的影響。比較合金化後的表面粗糙度以及摩擦力。3前言再鑄層3實驗方法與結果田口方法4實驗方法與結果田口方法4Table1

FixedandvariableparametersusedforEDWMofTialloys5Table1

FixedandvariablepaTable2

L8orthogonalarrayusedforEDWMofTialloys6Table2

L8orthogonalarrayusFig1.MicrostructuresfollowingEDWM:(a)Ti-6Al-4Vand(b)γ-TiAlworkpieces7Fig1.MicrostructuresfollowiFig2.Close-upmicrocracksinγ-TiAlworkpiecefollowingEDWMFig3.Workpiecemicrohardness(10μmformsurface)followingEDWM8Fig2.Close-upmicrocracksinFig4.maineffectplotsandANOVAfor:(a,b)Ti-6Al-4Vand(c,d)γ-TiAl9Fig4.maineffectplotsandATable3.Steelworkpiecesamplesusedforwear/tribologyassessmentFig5.MicrographofEDT/alloyedlayerFig6.MicrographofCr-platedEDTsurface10Table3.Fig5.MicrographofEFig7.Scratchtestresultsforrollsamplestextured/alloyedwithpartiallysinteredWC/Coelectrodes(SampleA)andtexturedwithgraphiteelectrodes(SampleB):(a)unidirectionaland(b)bi-directionaltests.Fig8.Unidirectionalscratchtestresultsforrollspecimens:(a)textured/alloyedwithWC/Copartiallysinteredelectrodes(SampleA)andtexturedwithgraphitetoolelectrodesandCr-plated(SampleC)11Fig7.Scratchtestresultsfor結論線放電加工過後的再鑄層厚度為1μm至136μm，硬度為50HK0.025至900HK0.025。幾乎過半測試結果皆小於母材硬度。12結論12結論使用WC/Co電極所形成的表面硬度為最高(超過900HK0.025)，且摩擦係數減少50%。使用習用電極加工，在表面鍍上一層Cr，摩擦力比WC/Co電極所形成的表面少30%。13結論使用WC/Co電極所形成的表面硬度為最高(超過900HKThanksforyourattention14Thanksforyourattention14ElectricaldischargesurfacealloyingH.G.Leea,∗,J.Simaoa,D.K.Aspinwalla,R.C.Dewesa,W.VoicebaDepartmentofMechanicalEngineering,SchoolofEngineering,UniversityofBirmingham,Edgbaston,BirminghamB152TT,UKbRo