激光冲击微造型铝硅合金表面摩擦学性能-研究

《激光冲击微造型铝硅合金表面摩擦学性能-研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、万方数据激光冲击微造型铝硅合金表面摩擦学性能研究II万方数据江苏大学硕士学位论文ABSTRACTLaserPeeningTexturing(LPT)isthetechnologywhichpreparesthemicro-dimplearraysonthespecimensbylaserpeeningtosignificantlyimprovethetribologyperformanceofthematerial．LPThastheadvantagesbothofthestrengtheneffectoflaserpeeningandtheimprovementoftribo

2、logyperformancebymicro—texture．Thereby,itiswidelyconcemedinthefieldoffrictionandwear．Inthisstudy,ZL109aluminium·siliconalloywasmicro-texturedbylaserpeening．Themechanicalpropertiesofspecimensuntexturedandmicro—texturedweremeasured．Thedryfrictionandmixedlubricationfrictiontestswerecarriedoutwi

3、ththemicro—texturedspecimenstoresearchtheinfluencelawofLPT．Themainworkisasfollows：1)Inthemechanicalproperties：Thestrengthenmechanismofresidualstress，micro-structureandmechanicalpropertiesWasdiscussedbasedonthetheoryofLPT．Thespecimensweremicro-texturedwithdifferentareadensitiyanddepthtodiamet

4、erratiobydifferentprocessingparametersofLPT．Therelationbetweenlaserprocessingparametersandmicro．texturecharacteristics(residualstress，nano-hardness，elasticitymodulus)wasestablishedthroughmeasuringthemicro-dimplemorphologytoprovidethebasisfortheselectionoffollowingfrictiontestparameters．2)Ind

5、ryfrictionperformance：Thedryfrictiontestswereaccomplishedtoanalyzethetribologyproperties(averagefrictioncoefficient，instantaneousfrictioncoefficient，weartrackdepth，wearvolume)ofspecimensmicro-texturedbydifferentlaserpeeningprocessingparameters．Accordingtothedryfriction—weartheoryandtheobserv

6、ationofwearsurfacemorphology，the(hyfriction-wearmechanismofdifferentspecimensuntexturedandmicro．texturedWasstudied．Theresultshowsthatthespecimensmicro．texturedwith30％areadensityand0．092depthtodiameterratiohavethebestdryfrictionperformance31Inmixedlubricationfrictionperformance：Themixedlubfic

7、miontestswereaccomplishedtostudymerelmionbetweenmicro．textm'echaracteristicsand1ubricationstate(instantaneousfrictioncoefficient)．Basedonthefriction—weartheoryofmixedlubrication．theinfluenceofmicro．texturecharacteristicsonmixedlubricationfrictionpe