等離子弧淬火對缸套耐磨性影響的研究.pdf

1、東北大學(xué)碩士學(xué)位論文等離子弧淬火對缸套耐磨性影響的研究姓名：張悅玫申請學(xué)位級別：碩士專業(yè)：機(jī)械設(shè)計(jì)及理論指導(dǎo)教師：丁津原2000.2.1查苧盔堂堡主堂垡堡塞一一———————————i!—蔓AbstractThedissertationintroducesallupandcomingtechnologyplasmaarcquenchtreatmentandshowsthefeasibilityandadvantageofapp!ying

2、ittothecylinderindustryItstartedwiththecontrolofthetechnologicalparametersandstudiedtheaffectingfactorsofthehardness，widthanddepthofthequenchedbandTheeffectlawofthepowervelocityoftheplasmaarCwasanalyzedThearticleproceede

3、dwithheattransferprocessandforecastedtheformofthequenchedbandTheperformanceofthemicrostructure，thedistributingofhardnessandwearableabilityofthehardnesslayerongreycastironaddedBwasexaminedbytheexperimentWedesignedtheexper

4、imentalquenchingequipmentbyourselvesanditmostlyusedfortheexteriorsurfaceofcolumn，fortheworkpieceofothertypes，wecalldesigndifferentfixtureforitThemicrostructureobservedbySEMshowed：thecylinderafterplasmaarcquenching，thestr

5、uctureisfineapparentlyThedensityofcarboninthemartensiteareawassouneventhatitpreparesconditionforfinenessandsmallnessofmartensiteBecauseoffastrefrigerantvelocitythecarbonizationseparatingoutCan’tgrowandformfinehardenedstr

6、uctureItimprovesthewearableabilityofcylindermuchThesurfacehardnessafterplasmaarcquenchingCanachievethehardnessvalueofHV805，thehighestHV920Thevalueis250higherthancommonheattreatment，andthethicknessofhardenedlayeris02O6mmt

7、hewidthiS3～6mmThedistributionofhardnessisstableandrational，avoidingfissuraandfindereduetohighhardnessThequenchinglayertakesonlikeacrescentandchangesitssizewiththeparametersThefrictionandwearexperimentbasedontheworkparame

8、tersofenginecylinderandexaminedonRFT—IIIexperimentalmachineThequantityofwearandfrictioncoemcientreducedindifferentextentItvalidateswearableabilityisheightenedandisneartotheresultquenchedbylaserKeyWords：plasmaarc，surfaceq