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1、华中科技大学硕士学位论文铁基金属粉末激光烧结与等静压复合成形技术研究姓名：陈英申请学位级别：硕士专业：材料加工工程指导教师：史玉升20080604华中科技大学硕士学位论文合金Fe-5Cu-0.5C最好，其0.2屈服强度达417MPa，抗拉强度521MPa，弹性模量139.5GPa，延伸率7.9%。综上所述，SLS/CIP/HIP复合成形技术制造高致密与良好力学性能复杂金属零件的工艺路线切实可行。本研究促进了SLS技术向高性能、高复杂度金属零件的高效成形制造方向发展，拓宽了SLS与等静压技术的应用领域，具有重要的理论和工程意义。关键词：选择性激光烧结；等静压；合金零件；微观组织
2、；机械性能II华中科技大学硕士学位论文AbstractIndirectSelectiveLaserSintering(SLS)canmanufactureanytypesofpartswithcomplexstructure,butwithhighporosityandlowstrength.Theaboveshortagescouldbeimproved,byusingthetechnologyofvacuumsinteringandinfiltrating,however,theproblemofdeformationretractioneasilyhappenedins
3、interedparts,andmechanicalpropertieswere“polluted”byinfiltrationmaterials.Therefore,itwillbeacombinationformedSLS/IsostaticPressing(IP)complexprocesstoachievehighperformanceandcomplicatedparts,whichcanutilizefullytheirownspecificadvantages.Mainresearchcontentsandconclusionsarebelow.（1）Compo
4、siteprocessofSLS/ColdIsostaticPressing(CIP)/HotIsostaticPressing(HIP)wasdeveloped.Ironalloysystemcompositepowderscomposedofalloyelementpowders,suchasFe-C、Fe-Ni-CandFe-Cu-C,andAISI304stainlesssteelpowders,weredevelopedwithepoxyresinE-12asbindermaterial.Alloypartsmadebythenewprocessobtainedhi
5、ghdensityandgoodmechanicalpropertieswithoutshapeerrorthroughSLS,degreasing,CIP,high-temperaturesinteringandHIP.（2）CanningmaterialsusedinSLS/CIPareinvestigated.ComplicatedSLSpartscouldbesealedbysiliconrubberRTV-2whichhashighcuring-processrate,highelasticityandgoodperformanceoftightness.RTV-2
6、issuitableforSLS/CIPcanningmaterial.（3）DensityofpartsaftereachstepoftheprocessweremeasuredaccordingtotheArchimedesprinciple,Theresultsshowedthatdensitywasabout40%afterdegreasing,andcouldbe90%afterCIP.ThroughvacuumsinteringandHIP,densityincreasescontinually.AndthebestonewasFe-0.5Cpartswithde
7、nsityof98.5%.（4）RelationbetweendensityandCIPworkingpressureofAISI304stainlesssteelwasresearched,andtheresultapproximatelymetthelog-logpressingtheory.（5）MechanismsandtechnologiesofSLS/CIP,hightemperaturesinteringandHIPareinvestigatedwitheffectsoftheirtech
